阅读说明：本技术 暖热水供给装置 (Hot water supply device ) 是由 影山彰久 森本启史 于 2019-04-08 设计创作，主要内容包括：本发明提供一种供暖热水供给装置,其在从供暖运转向供暖热水供给同时运转转移时,可减轻由于所述转移而可能带来的不适感。供暖热水供给装置包括：燃烧元件；热交换器,利用燃烧元件的热将供暖热媒加热至目标热媒温度；循环通路,用于将热交换器连接于外部的供暖终端；循环元件,使供暖热媒在循环通路循环；旁通通路,从循环通路分支并绕开供暖终端；分配元件,对循环通路与旁通通路分配供暖热媒；热水供给用热交换器,设置于旁通通路；供水通路,对热水供给用热交换器供给上水；热水供给通路,用于以热水供给设定温度供给由热水供给用热交换器加热的热水；以及控制元件,至少对燃烧元件、循环元件及分配元件进行控制,所述控制元件能够以能够应对供暖运转、热水供给运转及供暖热水供给同时运转的方式调整分配元件的分配比,在从供暖运转向供暖热水供给同时运转转移时,在进行供暖的供暖终端为暖风供暖机的情况下,控制元件使所述目标热媒温度上升。(The invention provides a heating hot water supply device which can reduce the uncomfortable feeling caused by the shift when the operation shifts from the heating operation to the heating hot water supply simultaneous operation. The heating hot water supply device comprises: a combustion element; a heat exchanger that heats the heating medium to a target heating medium temperature using heat of the combustion element; a circulation path for connecting the heat exchanger to an external heating terminal; a circulation element for circulating the heating medium in the circulation path; a bypass passage branching from the circulation passage and bypassing the heating terminal; a distribution element for distributing heating medium to the circulation path and the bypass path; a hot water supply heat exchanger provided in the bypass passage; a water supply passage for supplying feed water to the hot water supply heat exchanger; a hot water supply passage for supplying hot water heated by the hot water supply heat exchanger at a hot water supply set temperature; and a control unit that controls at least the combustion unit, the circulation unit, and the distribution unit, wherein the control unit is capable of adjusting the distribution ratio of the distribution unit so as to be compatible with the heating operation, the hot water supply operation, and the simultaneous heating and hot water supply operation, and when the operation is shifted from the heating operation to the simultaneous heating and hot water supply operation, the control unit increases the target heat medium temperature when the heating end at which heating is performed is the hot air heater.)

1. A heating hot water supply apparatus comprising: a combustion element; a heat exchanger for heating a heating medium to a target heating medium temperature using heat generated by the combustion element; a circulation path for connecting the heat exchanger to an external heating terminal; a circulation element provided in the circulation passage to circulate the heating medium; a bypass passage branching from the circulation passage and bypassing the heating terminal; a distribution member for distributing the heating medium to the circulation passage and the bypass passage; a hot water supply heat exchanger provided in the bypass passage; a water supply passage for supplying the hot water supply heat exchanger with the supply water; a hot water supply passage for supplying hot water heated by the hot water supply heat exchanger at a predetermined hot water supply set temperature; and a control unit that controls at least the combustion unit, the circulation unit, and the distribution unit, and the heating hot water supply device is characterized in that:

the control element can adjust the distribution ratio of the distribution element so as to cope with the heating operation, the hot water supply operation and the simultaneous heating and hot water supply operation, and

when the simultaneous operation shifts from the heating operation to the heating hot water supply operation, the control unit increases the target heat medium temperature when the heating terminal performing heating is the hot air heater.

2. The heating hot water supply apparatus according to claim 1, wherein: the heating system includes a temperature detection device for detecting a temperature of the heating medium returned from the heating terminal to the heat exchanger, and the control device increases the target heating medium temperature on condition that the temperature detected by the temperature detection device decreases by a predetermined value or more due to a transition from the heating operation to the simultaneous heating and hot water supply operation.

3. The heating hot water supply apparatus according to claim 4, wherein: the temperature detection element is disposed on the heating terminal side of a junction of the circulation passage and the bypass passage.

4. A heating hot water supply apparatus comprising: a combustion element; a heat exchanger for heating a heating medium to a target heating medium temperature using heat generated by the combustion element; a circulation path for connecting the heat exchanger to an external heating terminal; a circulation element provided in the circulation passage to circulate the heating medium; a bypass passage branching from the circulation passage and bypassing the heating terminal; a distribution member for distributing the heating medium to the circulation passage and the bypass passage; a hot water supply heat exchanger provided in the bypass passage; a water supply passage for supplying the hot water supply heat exchanger with the supply water; a hot water supply passage for supplying hot water heated by the hot water supply heat exchanger at a predetermined hot water supply set temperature; and a control unit that controls at least the combustion unit, the circulation unit, and the distribution unit, and the heating hot water supply device is characterized in that:

the control element can adjust the distribution ratio of the distribution element so as to cope with the heating operation, the hot water supply operation and the simultaneous heating and hot water supply operation, and

when the heating terminal performing heating is a hot air heater, the control means adjusts the distribution ratio of the distribution means from the heating operation distribution ratio to a predetermined initial distribution ratio different from the hot water supply operation distribution ratio when shifting from the heating operation to the simultaneous heating and hot water supply operation.

5. The heating hot water supply apparatus according to claim 4, wherein: when the heating terminal performing heating is not the hot air heater, the control means adjusts the distribution ratio of the distribution means from the heating operation distribution ratio to the hot water supply operation distribution ratio when shifting from the heating operation to the simultaneous heating and hot water supply operation.

6. The heating hot water supply apparatus according to claim 4, wherein: the control means adjusts the distribution means to a distribution ratio corresponding to the heating demand capacity and the hot water supply demand capacity after a predetermined time has elapsed from the adjustment of the distribution ratio when the heating operation shifts to the simultaneous heating and hot water supply operation.

7. The heating hot water supply apparatus according to claim 6, wherein: when the heating terminal performing heating is a warm air heater, the control means adjusts the distribution ratio of the distribution means so that the distribution ratio of the circulation path-side ratio at the initial distribution ratio is set to a lower limit.

Technical Field

The present invention relates to a heating hot water supply device that heats and supplies a heating medium for heating, and supplies hot water using the heating medium.

Background

Conventionally, as a heating terminal, for example, a central heating (central heating) device that circulates and supplies a heated heating medium to a heater and that supplies hot water using heat of the heating medium is used to perform heating in a house at once. For example, as disclosed in patent document 1, a heating hot water supply device is known in which the supply amount of fuel is adjusted by the temperature of a heating medium after heating in order to adjust the amount of heat corresponding to each value of the temperature of heating and the supply amount of hot water.

The air heater includes a heating heat exchanger that exchanges heat between a heating medium and air, and an air blower, and delivers indoor air to the heating heat exchanger by the air blower, and delivers air heated by the heating heat exchanger to the indoor as warm air. A radiator or a floor heating apparatus that performs heating by utilizing radiant heat of a heating medium or natural convection of air is also often used as a heating terminal other than a hot air heater.

The heating hot water supply device comprises: a combustion unit that burns fuel, a heat exchanger that performs heat exchange between the high-temperature combustion gas generated by the combustion unit and the heating medium, a hot water supply heat exchanger that performs heat exchange between the heating medium and hot water for hot water supply, and the like. In the heating operation, a heating medium is circulated between the heat exchanger and the heating terminal. In the hot water supply operation, hot water heated by the hot water supply heat exchanger is supplied via the heating medium.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. Sho 49-48746

Disclosure of Invention

Problems to be solved by the invention

In general, the heating operation of the central heating is continuous, and is performed for the entire period of winter, for example, whereas the hot water supply operation is performed only during hot water supply regardless of the season, and is often completed in a time shorter than the heating operation. When hot water supply is started in the heating operation and the hot water supply operation are performed simultaneously, the amount of heat supplied to the heating terminal decreases by preferentially supplying hot water, and the heating capacity decreases.

In this case, when the heating terminal for heating is a radiator or a floor heating apparatus, the human body does not feel as it is even if the radiant heat or the like is reduced. On the other hand, when the heating terminal for heating is a hot air heater as in patent document 1, the temperature of the hot air blown by the hot air heater is lowered, and the hot air with the lowered temperature directly contacts the human body, which may give an uncomfortable feeling such as cold.

The invention aims to provide a heating hot water supply device which can reduce the uncomfortable feeling of a user caused by the transition when the operation is shifted from the heating operation to the heating hot water supply simultaneous operation.

Means for solving the problems

The heating hot water supply device of the first invention includes: a combustion element; a heat exchanger for heating a heating medium to a target heating medium temperature using heat generated by the combustion element; a circulation path for connecting the heat exchanger to an external heating terminal; a circulation element provided in the circulation passage to circulate the heating medium; a bypass passage branching from the circulation passage and bypassing the heating terminal; a distribution member for distributing the heating medium to the circulation passage and the bypass passage; a hot water supply heat exchanger provided in the bypass passage; a water supply passage for supplying the hot water supply heat exchanger with the supply water; a hot water supply passage for supplying hot water heated by the hot water supply heat exchanger at a predetermined hot water supply set temperature; and a control unit that controls at least the combustion unit, the circulation unit, and the distribution unit, and the heating hot water supply device is characterized in that: the control unit may adjust the distribution ratio of the distribution unit so as to be compatible with a heating operation, a hot water supply operation, and a simultaneous heating and hot water supply operation, and when the operation is shifted from the heating operation to the simultaneous heating and hot water supply operation, the control unit may increase the target heat medium temperature when the heating terminal performing heating is a hot air heater.

According to the above configuration, when the heating terminal is the hot air heater at the time of shifting from the heating operation to the simultaneous heating and hot water supply operation, the temperature of the heating medium heated by the heat exchanger is higher than that at the time of the heating operation because the target heat medium temperature is increased. Therefore, even if the heating medium is distributed for the hot water supply operation and the flow rate of the heating medium supplied to the hot air heater is decreased, the decrease in the amount of heat supplied to the hot air heater can be compensated for by the increase in the temperature of the heating medium, and therefore the decrease in the temperature of the hot air heater can be suppressed.

In a preferred first aspect, the heating system includes a temperature detection device for detecting a temperature of the heating medium returned from the heating terminal to the heat exchanger, and the control device increases the target temperature of the heating medium when the temperature detected by the temperature detection device decreases by a predetermined value or more due to a transition from the heating operation to the hot water supply simultaneous operation.

According to the above configuration, when the temperature of the heating medium used for heating and returned to the heat exchanger during the simultaneous heating and hot water supply operation is decreased by a predetermined value or more, the heating medium is set to a temperature higher than that during the heating operation.

In this way, the amount of heat supplied to the warm air heater can be increased by the increase in temperature of the heating medium, and therefore, the temperature drop of the warm air in the warm air heater can be suppressed.

In a preferred second aspect, the temperature detection element is disposed on the heating terminal side with respect to a junction of the circulation passage and the bypass passage.

According to the above configuration, the temperature of the heating medium returned to the heat exchanger after being used for heating can be detected, and the temperature drop of the hot air in the hot air heater can be grasped. Therefore, the temperature of the hot air in the hot air heater can be suppressed from decreasing by setting an appropriate target heat medium temperature.

A heating hot water supply device according to a second aspect of the present invention includes: a combustion element; a heat exchanger for heating a heating medium to a target heating medium temperature using heat generated by the combustion element; a circulation path for connecting the heat exchanger to an external heating terminal; a circulation element provided in the circulation passage to circulate the heating medium; a bypass passage branching from the circulation passage and bypassing the heating terminal; a distribution member for distributing the heating medium to the circulation passage and the bypass passage; a hot water supply heat exchanger provided in the bypass passage; a water supply passage for supplying the hot water supply heat exchanger with the supply water; a hot water supply passage for supplying hot water heated by the hot water supply heat exchanger at a predetermined hot water supply set temperature; and a control unit that controls at least the combustion unit, the circulation unit, and the distribution unit, and the heating hot water supply device is characterized in that: the control means may adjust the distribution ratio of the distribution means so as to be compatible with a heating operation, a hot water supply operation, and a simultaneous heating and hot water supply operation, and when the heating terminal performing heating is a hot air heater when shifting from the heating operation to the simultaneous heating and hot water supply operation, the control means adjusts the distribution ratio of the distribution means from the distribution ratio for the heating operation to a predetermined initial distribution ratio different from the distribution ratio for the hot water supply operation.

According to the above configuration, by adjusting the distribution ratio of the distribution element to the predetermined initial distribution ratio different from the distribution ratio for hot water supply operation, it is possible to supply the heating medium to the hot air heater more than the case of the distribution ratio for hot water supply operation, and to alleviate the temperature drop of the hot air.

In a preferred third aspect, when the heating terminal that performs heating is not the hot air heater when shifting from the heating operation to the simultaneous heating and hot water supply operation, the control means adjusts the distribution ratio of the distribution means from the heating operation distribution ratio to the hot water supply operation distribution ratio.

According to this configuration, even when the hot water is preferentially supplied by adjusting the distribution ratio for hot water supply operation when the heating terminal performing heating is not the hot air heating machine, there is no possibility that the heating user will feel uncomfortable.

In this way, by varying the distribution ratio when the simultaneous operation of the heating hot water supply is shifted according to the type of the heating terminal, the possibility of giving a heating user a sense of discomfort can be reduced even if the hot water is supplied preferentially.

In a preferred fourth aspect, the control means adjusts the distribution ratio of the distribution means to the heating demand capacity and the hot water supply demand capacity after a predetermined time has elapsed from the adjustment of the distribution ratio when the simultaneous operation of heating and hot water supply is shifted from the heating operation to the heating operation by the hot air heater.

According to the above configuration, the distributor is adjusted to the distribution ratio that gives priority to the hot water supply operation at the beginning of the shift to the heating hot water supply simultaneous operation, and after a predetermined time has elapsed in this state, the distributor is adjusted in accordance with the heating demand capacity required for the heating operation and the hot water supply demand capacity required for the hot water supply operation. In this way, after a predetermined time has elapsed, heat can be supplied to the heating terminal, and therefore the possibility of giving a heating user a sense of discomfort can be reduced.

In a preferred fifth aspect, when the heating terminal performing heating is a warm air heater, the control device adjusts the distribution ratio so that the distribution ratio of the circulation path-side ratio at the initial distribution ratio is set to a lower limit.

According to the above configuration, when the heating terminal for heating is the warm air heater, the distribution ratio of the distribution element is adjusted so that the distribution ratio of the circulation path side at the initial distribution ratio is set to the lower limit, and therefore the amount of heat supplied to the warm air heater can be ensured.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the heating hot water supply device of the present application, when the heating operation shifts to the heating hot water supply simultaneous operation, it is possible to reduce the uncomfortable feeling that may be caused by the shift from the heating operation to the heating hot water supply simultaneous operation, such as a decrease in the temperature of the hot air in the hot air heater.

Drawings

Fig. 1 is a diagram showing an overall configuration of a hot water heating system according to an embodiment of the present invention.

Fig. 2 is a diagram showing the configuration of the heating hot water supply apparatus according to the embodiment.

Fig. 3 is a flowchart of the distribution ratio control in the heating hot water supply simultaneous operation in embodiment 1.

Fig. 4 is a graph showing an actual measurement example of the warm air temperature when the control for increasing the target heat medium temperature is performed.

Fig. 5 is a flowchart of the distribution ratio control in the heating hot water supply simultaneous operation in embodiment 2.

Detailed Description

Hereinafter, a mode for carrying out the present invention will be described based on examples.

Example 1

First, the overall configuration of the hot water heating system 1 used for central heating will be described with reference to fig. 1.

The hot water heating system 1 is configured to supply a heating medium (hot water) heated by the heating hot water supply device 2 to a heating terminal 3 outside the heating hot water supply device 2, and the heating terminal 3 performs heating in a house at once. The warm water heating system 1 includes: the heating hot water supply device 2, the heating terminal 3, a heating circulation circuit 4 connecting these, an external pump 5 provided in the heating circulation circuit 4, and an airtight expansion tank 6 provided in the heating circulation circuit 4 to absorb the volume expansion of the heating medium due to the temperature rise. Although not shown, a heating terminal 3 is disposed in each of a plurality of rooms of a house, and when a heating medium is supplied to these rooms, the plurality of heating terminals 3 are connected in parallel to the heating cycle circuit 4.

The heating circulation circuit 4 includes a terminal circulation circuit part 4a that circulates and supplies the heating medium to the heating terminal by driving the external pump 5, and a heating circulation circuit part 4b that supplies the heating medium from the terminal circulation circuit part 4a to the heating hot water supply device 2 and supplies the heating medium heated by the heating hot water supply device 2 to the terminal circulation circuit part 4 a. The expansion tank 6 is provided upstream of the external pump 5 in the final circuit portion 4 a. The heating circuit portion 4b is connected to the upstream side of the expansion tank 6 of the final circuit portion 4 a.

Next, a hot air heater, a radiator, and a floor heating apparatus used as the heating terminal 3 will be described.

The warm air heater includes: the air-conditioning apparatus includes a heating heat exchanger that performs heat exchange between a heating heat medium and air, an air blower that supplies air to the heating heat exchanger and blows heated air into a room as warm air, a heating operation switch that drives and stops the air blower, and the like, and performs heating by forcibly convecting air. The operation of starting and stopping the heating operation or the setting of the heating set temperature may be performed from the warm air heater.

The radiator includes a heating heat exchanger that performs heat exchange between a heating medium and air, and performs heating using radiation heat of the heating medium or natural convection of air. The floor heating device is configured by covering a hose for circulating a heating medium disposed at an appropriate interval with a floor material, and performs heating by using radiant heat of the floor material heated by heat of the heating medium or natural convection of air. The heating terminal 3 can be classified according to the heating method because the hot air heating method is a heating method in which air is forcibly convected, and the radiator and the floor heating apparatus are heating methods using radiant heat or natural convection of air.

Next, the heating hot water supply device 2 will be described with reference to fig. 2.

The heating hot water supply device 2 is configured to perform a heating operation in which a heating medium heated by combustion heat generated by the combustion unit 7 (combustion element) is circulated between the heating terminal 3 and a hot water supply operation in which hot water is supplied while adjusting the temperature of the hot water heated by the heat of the heating medium to a hot water supply set temperature, and a heating hot water supply simultaneous operation in which the heating operation and the hot water supply operation are performed simultaneously.

The heating hot water supply device 2 includes: the combustion unit 7, the heat exchanger 8, a circulation passage 9 connecting the heat exchanger 8 and the heating terminal 3 to the heating circuit unit 4b of the heating circuit 4, an internal pump 10 (circulation element) provided on the upstream side of the circulation passage 9 from the heat exchanger 8, a control unit 16 (control element) for performing various controls including control of the heating operation and the like, and the like. The internal pump 10 circulates the heating medium in cooperation with the external pump 5 during the heating operation.

In the combustion section 7, the mixed gas supplied by mixing the supply air indicated by the arrow AS and the fuel gas indicated by the arrow F is combusted by driving the combustion fan 7 a. The amount of heat (combustion heat) of the combustion gas generated by the combustion of the combustion unit 7 is adjusted according to the rotation speed of the combustion fan 7 a. The heat exchanger 8 exchanges heat between the combustion gas generated by the combustion unit 7 and the heat medium flowing through the circulation passage 9, and heats the heating heat medium to a preset target heat medium temperature. The combustion gas whose temperature has dropped due to the heat exchange is discharged to the outside as indicated by arrow E.

Further, the heating hot water supply device 2 includes: a first bypass passage 11 (bypass passage), a hot water supply heat exchanger 20 provided in the first bypass passage 11, a water supply passage 19, a hot water supply passage 21, and the like. The first bypass passage 11 branches from the circulation passage 9 on the downstream side of the heat exchanger 8 so as to bypass the heating terminal connected to the heating circulation circuit 4, and is connected to the circulation passage 9 at a junction C1 on the upstream side of the built-in pump 10. The water supply passage 19 supplies the hot water supply heat exchanger 20 with the supply water as indicated by an arrow CW. The hot water supply passage 21 supplies the hot water heated by the hot water supply heat exchanger 20 to a hot water supply tap or the like as indicated by an arrow HW.

Next, the circulation path 9 will be explained.

The circulation passage 9 includes a first temperature sensor 12 (temperature detection element) on the upstream side (heating terminal 3 side) of the junction C1 with the first bypass passage 11, a second temperature sensor 13 between the built-in pump 10 and the heat exchanger 8, and a third temperature sensor 14 on the downstream side of the heat exchanger 8. The first temperature sensor 12 detects the temperature of the heating medium used for heating that is returned from the heating terminal of the heating circulation circuit 4 to the heat exchanger 8. The second temperature sensor 13 detects the temperature of the heating medium flowing into the heat exchanger 8. The third temperature sensor 14 detects the temperature of the heating medium heated by the heat exchanger 8. Based on the detected temperatures of these sensors, the control unit 16 controls the combustion fan 7a, the internal pump 10, the external pump 5, and the like so that the temperature of the heated heating medium becomes the target heating medium temperature (for example, 70 ℃).

A first distribution valve 15 (distribution element) is provided at a branching portion between the circulation passage 9 and the first bypass passage 11. The first distribution valve 15 can adjust the distribution ratio so as to be able to cope with the heating operation, the hot water supply operation, and the simultaneous heating and hot water supply operation. The controller 16 adjusts the distribution ratio of the first distribution valve 15 so as to distribute the heating medium heated by the heat exchanger 8 to the circulation passage 9 and the first bypass passage 11.

The distribution ratio of the first distribution valve 15 is adjusted to a distribution ratio for heating operation in which the heating medium is supplied only to the circulation passage 9 during heating operation, and is adjusted to a distribution ratio for hot water supply operation in which the heating medium is supplied only to the first bypass passage 11 during hot water supply operation. In the simultaneous heating and hot water supply operation, the distribution ratio of the first distribution valve 15 is adjusted so that hot water is supplied preferentially, and the heating medium is distributed to the circulation passage 9 and the first bypass passage 11. The heating medium distributed to the circulation passage 9 is supplied to the heating circulation circuit 4 as indicated by an arrow HS. The heating medium distributed to the first bypass passage 11 merges with the heating medium in the circulation passage 9 at the merging portion C1. A supply passage 18 for supplying the heating medium as indicated by an arrow AF is connected between the internal pump 10 and the first temperature sensor 12.

Next, the hot water supply heat exchanger 20 will be described.

The hot water supply heat exchanger 20 exchanges heat between the heating medium in the first bypass passage 11 and the hot water supplied from the water supply passage 19, and supplies the heated hot water to the hot water supply passage 21. The water supply passage 19 includes: a second distribution valve 23, a flow rate adjustment valve 24, a flow rate sensor 25, and a feed water temperature sensor 26.

A second bypass passage 22 branches from the water supply passage 19, and a second distribution valve 23 whose distribution ratio can be adjusted is disposed at the branching portion. The second distribution valve 23 distributes the feed water to the hot water supply heat exchanger 20 and the second bypass passage 22 to which the water supply passage 19 is connected. The flow rate adjustment valve 24 adjusts the flow rate of the feedwater into the second distribution valve 23. The flow sensor 25 detects the flow rate of the feedwater into the second distribution valve 23. The inlet water temperature sensor 26 detects the temperature of the inlet water to the second distribution valve 23.

The second bypass passage 22 is connected to the hot water supply passage 21 at a junction C2. A hot water outflow temperature sensor 27 is provided between the joining portion C2 of the hot water supply passage 21 and the hot water supply heat exchanger 20. The hot water outflow temperature sensor 27 detects the temperature of the hot water flowing out of the hot water supply heat exchanger 20.

A hot water supply temperature sensor 28 is provided downstream of the junction C2 of the hot water supply path 21. The hot water supply temperature sensor 28 detects the hot water supply temperature of the hot water to be supplied, which is a mixture of the hot water heated by the hot water supply heat exchanger 20 and the feedwater flowing through the second bypass passage 22. In the hot water supply operation, the control unit 16 adjusts the distribution ratio of the second distribution valve 23 so that the hot water supply temperature becomes the set hot water supply set temperature.

Next, the control unit 16 will be described with reference to fig. 1 and 2.

The control unit 16 is connected to an operation terminal 17, and the operation terminal 17 is used to perform setting operations such as a heating set temperature, a hot water supply set temperature, and a target heat medium temperature, and operations such as starting and stopping a heating operation. The operation terminal 17 includes a display unit 17a capable of displaying information such as various temperatures and operation states, and a switch unit 17b for performing setting operations and the like. The control unit 16 is communicably connected to the heating terminal 3, the external pump 5, and the outside air temperature sensor 30 disposed outdoors, and acquires operation information and the like thereof.

The controller 16 controls each of the heating operation, the hot water supply operation, and the heating and hot water supply simultaneous operation by controlling the combustion unit 7 including the combustion fan 7a, the built-in pump 10, the external pump 5, the first distribution valve 15, the second distribution valve 23, the flow rate adjustment valve 24, and the like based on detection signals of various sensors such as the first temperature sensor 12 and the like, which are communicatively connected. The target heat medium temperature may be set by the control unit 16 based on the heating set temperature, and the heating set temperature may be set by the control unit 16 receiving the temperature set by the heating terminal 3.

Next, the hot water supply operation will be described.

When the hot water supply is started by turning on a hot water supply tap or the like during standby and the flow rate sensor 25 detects a flow rate equal to or higher than a predetermined value at which the hot water supply operation is started, the control unit 16 starts combustion in the combustion unit 7, drives the internal pump 10, and adjusts the first distribution valve 15 to the distribution ratio for hot water supply operation so that the heating medium is supplied only to the first bypass passage 11.

The heating heat medium heated to the target heat medium temperature by the heat exchanger 8 by the combustion heat of the combustion unit 7 heats the hot water supplied from the water supply passage 19 by the hot water supply heat exchanger 20, and the heated hot water flows through the hot water supply passage 21. The control unit 16 adjusts the distribution ratio of the second distribution valve 23 based on the hot water temperature detected by the hot water outflow temperature sensor 27 and the temperature of the hot water supplied by the intake water temperature sensor 26, and controls the mixing ratio of the hot water at the merging portion C2 so that the temperature detected by the hot water supply temperature sensor 28 becomes the hot water supply set temperature. When the hot water supply tap or the like is turned off and the flow sensor 25 no longer detects a flow rate equal to or greater than a predetermined value, the control unit 16 ends the hot water supply operation and stands by.

Next, the heating operation will be described.

When the heating operation is started by the operation of the warm air heater 3 or the operation terminal 17 during standby, the controller 16 starts the combustion of the combustor 7, drives the external pump 5 and the internal pump 10, and adjusts the first distribution valve 15 so as to supply the heating medium only to the circulation passage 9 in order to supply the heating medium to the heating circulation circuit 4. The heating heat medium heated to the target heat medium temperature by the heat exchanger 8 by the combustion heat of the combustion unit 7 is supplied to the heating terminal 3 and used for heating, and then a part of the heating heat medium is returned to the heat exchanger 8 of the heating hot water supply device 2 and reheated. When the heating operation is stopped by an operation of the operation terminal 17 or the like, the control unit 16 waits for the combustion stop of the combustion unit 7 or the like.

Next, a transition from the heating operation to the simultaneous heating and hot water supply operation will be described.

In the heating operation, immediately after the start of the heating operation, the room temperature is substantially stabilized around the heating set temperature, and the temperature drop of the heating medium due to heating is unlikely to increase, so that the combustion heat amount generated by the combustion unit 7 is excessive. When the hot water supply tap or the like is opened to start the hot water supply in the heating operation and the flow rate sensor 25 detects a flow rate equal to or higher than a predetermined value, the controller 16 adjusts the distribution ratio of the first distribution valve 15 to supply the heating medium to the first bypass passage 11 as well and shifts to the heating hot water supply simultaneous operation.

The controller 16 increases the amount of combustion heat generated by the combustion unit 7 so that the heating medium, which is heated and supplied with hot water simultaneously and has a greatly reduced temperature, can be heated to the target heating medium temperature.

The hot water is preferentially supplied when the simultaneous operation of the heating and hot water supply is shifted, and the first distribution valve 15 is adjusted so that the heating medium distributed to the first bypass passage 11 is larger than the circulation passage 9 in order to supply warm hot water as quickly as possible so as not to give a user a sense of discomfort to the hot water supply. In the case where the heating terminal 3 for heating is a hot air heating machine of a heating system in which air is forcibly convected, it is easy to feel that the temperature of the hot air directly touching the human body is decreased. Therefore, when the amount of heat supplied from the heating hot water supply device 2 to the heating circulation circuit 4 decreases, the heating user may feel cold and feel uncomfortable. On the other hand, in the case where the heating terminal 3 for heating is a radiator of a heating system using radiant heat or natural convection of air, or a floor heating apparatus, it is difficult for a human body to feel the radiant heat or the like. Therefore, even if the amount of heat supplied from the heating hot water supply device 2 to the heating circulation circuit 4 decreases, there is little possibility that the heating user will immediately feel cold.

The present embodiment 1 is described by taking, as an example, a case where a warm air heater is provided as the heating terminal 3. Therefore, when a predetermined rising condition is satisfied during the simultaneous operation of the heating and hot water supply, the target heat medium temperature is temporarily raised to compensate for the decrease in the amount of heat supplied.

Next, based on the flowchart of fig. 3, the distribution ratio control at the time of the heating hot water supply simultaneous operation shift (the control is executed by the control unit 17) for controlling the distribution ratio of the first distribution valve 15 at the time of the heating hot water supply simultaneous operation shift. Si (i ═ 1, 2, and …) in the figure represents a step.

At S1, it is determined whether or not the operation is shifted from the heating operation to the heating hot water supply simultaneous operation. If the determination is Yes (Yes), the process proceeds to S2, and if the determination is No (No), the process returns without increasing the target heat medium temperature. Next, at S2, it is determined whether or not the heating terminal 3 is a warm air heating machine. If the determination is yes, the process proceeds to S3, and if the determination is no, the process returns without increasing the target heat medium temperature.

Next, at S3, it is determined whether or not the temperature of the heating medium returned to the heat exchanger 8 of the heating hot water supply device 2 has dropped by a predetermined value or more due to the transition from the heating operation to the heating hot water supply simultaneous operation. For example, it is determined whether the temperature of the heating medium detected by the first temperature sensor 12 has dropped by a predetermined value or more (for example, 10 ℃ or more) before and after the transition to the simultaneous operation of heating hot water supply.

After the shift to the simultaneous heating and hot water supply operation, the heating medium supplied from the heating and hot water supply device 2 and used for heating takes a time corresponding to the length of the heating circulation circuit 4 before returning to the heating and hot water supply device 2. Therefore, the determination at S4 is performed after 1 minute, for example, as the predetermined time after the shift to the simultaneous heating and hot water supply operation. The predetermined time is set according to the hot water heating system 1 at the time of construction. If the determination is yes, the process proceeds to S4, and if the determination is no, the process returns without increasing the target heat medium temperature. If the hot water supply is ended before the determination, the process returns.

Next, in S4, the target heat medium temperature is raised and then returned. The rise value of the target heat medium temperature at this time is, for example, a predetermined temperature such as 20 ℃. In order to compensate for the reduction in the amount of heat supplied to the warm-air heater while suppressing excessive combustion, the value of the increase may be calculated, for example, such that the temperature detected by the first temperature sensor 12 returns to the temperature during the heating operation. The target heat medium temperature is limited to be not higher than an upper limit value thereof so as not to exceed an upper limit value (for example, 95 ℃) that is set in advance for safety.

When raising the target heat medium temperature, the controller 16 increases the amount of combustion heat of the burner 7 to bring the temperature of the heated heating heat medium closer to the raised target heat medium temperature. By increasing the target heat medium temperature, the decrease in the amount of heat supplied to the hot air heater during the simultaneous heating and hot water supply operation is compensated for, and the decrease in the temperature of the hot air in the hot air heater is suppressed.

Fig. 4 shows an example in which the change in the warm air temperature of the warm air heater 3 caused by the control to increase the target heat medium temperature is actually measured. Before time t1, the heating operation is performed at the target heat medium temperature of 70 ℃, and the warm air temperature is stabilized at about 55 ℃. When the operation shifts to the heating hot water supply simultaneous operation at time t1, the amount of heat supplied from the heating hot water supply device 2 fluctuates before the hot water supply temperature is reached by preferentially supplying hot water, so the warm air temperature fluctuates greatly, and from around time t2, the warm air temperature stabilizes at a temperature lower than that during the heating operation. At time t3 after a predetermined time has elapsed from time t1, the first temperature sensor 12 detects that the heating medium has a temperature drop equal to or greater than a predetermined value, and increases the target heat medium temperature by the calculated temperature (e.g., 22 ℃). The heating medium having the high temperature reaches the hot air heater 3 from time t4, the hot air temperature rises, and thereafter the hot air temperature stabilizes at substantially the same temperature as during the heating operation.

When the rise condition of S3 is omitted and the rise conditions of S1 and S2 are satisfied, the target heat medium temperature may be increased by a predetermined rise value. When the operation shifts from the heating operation to the simultaneous heating and hot water supply operation, the amount of heat supplied to the warm air heater is increased, and the temperature drop of the warm air in the warm air heater can be suppressed. Since the amount of heat supplied to the warm air heater is increased before the decrease in the detected temperature of the first temperature sensor 12 is detected, the decrease in the temperature of the warm air heater can be suppressed in advance.

Further, the distribution ratio control during the simultaneous heating and hot water supply operation may be repeated during the simultaneous heating and hot water supply operation by changing the rising condition at S3 to a temperature detected by the first temperature sensor 12 that is equal to or lower than a predetermined temperature. For example, although it is not necessary to increase the target heat medium temperature at the beginning of the transition to the simultaneous heating and hot water supply operation, the amount of heat supplied may be increased when the temperature of the hot air in the hot air heater 3 decreases due to an increase in the hot water supply flow rate or the like in the simultaneous heating and hot water supply operation. The order of determination of the rising conditions in S1 to S3 can be changed.

When the hot water supply tap or the like is turned off and the flow rate sensor 25 no longer detects a flow rate equal to or greater than the predetermined value, the controller 16 switches from the simultaneous heating and hot water supply operation to the heating operation by adjusting the first distribution valve 15 so as to supply the heating medium only to the circulation passage 9. At this time, the target heat medium temperature is returned to the original set value.

The operation and effect of the heating hot water supply apparatus 2 will be described.

When the heating terminal 3 is the hot air heating machine, the heating hot water supply device 2 increases the target heat medium temperature when the heating operation shifts to the simultaneous heating and hot water supply operation, and therefore the temperature of the heating heat medium heated by the heat exchanger 8 becomes higher than that during the heating operation. Therefore, even if the heating medium is distributed for the hot water supply operation and the flow rate of the heating medium supplied to the hot air heater is decreased, the amount of heat supplied to the hot air heater is compensated for, and therefore, the temperature decrease of the hot air blown by the hot air heater can be suppressed.

When the temperature of the heating medium returned to the heat exchanger 8 after being used is lower than the temperature during the heating operation by a predetermined value or more at the time of shifting from the heating operation to the simultaneous heating and hot water supply operation, the target heating medium temperature is raised to bring the heating medium temperature to a higher temperature than during the heating operation. In the case where there is a possibility that the temperature of the warm air in the warm air heater may decrease greatly, the amount of heat supplied to the warm air heater can be increased by the temperature increase of the heating medium, and therefore the temperature decrease of the warm air in the warm air heater can be suppressed.

The temperature of the heating medium used for heating before the heating medium used for hot water supply merges and then returns to the heat exchanger 8 can be detected, and the temperature required to suppress the temperature drop of the hot air in the hot air heater can be grasped. Therefore, when the target heat medium temperature is raised, the temperature of the hot air in the hot air supply device can be suppressed from being lowered by setting an appropriate target heat medium temperature.

When the operation for starting the heating operation is performed during the hot water supply operation, since the hot water is supplied preferentially, the heating operation may not be started until the hot water supply is completed, or the operation may be shifted to the simultaneous heating and hot water supply operation. When the operation is shifted to the simultaneous heating and hot water supply operation, the target heat medium temperature may be temporarily increased in the same manner as described above.

Example 2

The above-described embodiment 2 is an example of a case where a warm air heater, a radiator, and/or a floor heating device are provided as the heating terminal 3. Therefore, when the operation shifts from the heating operation to the simultaneous heating and water supply operation, the first distribution valve 15 is adjusted from the distribution ratio for heating operation to a distribution ratio that differs according to the type of the heating terminal 3 or the heating system, when the operation shifts from the heating operation to the simultaneous heating and water supply operation, using the fact that the influence of the decrease in the amount of heat supplied to the heating terminal 3 differs depending on the type of the heating terminal 3 or the heating system. Note that the configurations shown in fig. 1 and 2 are the same as those in embodiment 1, and therefore, the description thereof is omitted.

Next, based on the flowchart of fig. 5, the distribution ratio control at the time of the heating hot water supply simultaneous operation shift (the control is executed by the control unit 17) for controlling the distribution ratio of the first distribution valve 15 at the time of the heating hot water supply simultaneous operation shift. Si (i ═ 10, 11, and …) in the figure indicates a step.

At S10, it is determined whether or not the operation is shifted from the heating operation to the heating hot water supply simultaneous operation. If the determination is yes, the process proceeds to S11, and if the determination is no, the process returns to continue the heating operation. Next, at S11, it is determined whether or not the heating terminal 3 that performs heating is a warm air heating machine. If the determination is yes, the process proceeds to S12, and if the determination is no, the process proceeds to S16.

When the heating terminal 3 is a warm air heater, in S12, the first distribution valve 15 is adjusted to a predetermined initial distribution ratio set in advance and to a distribution ratio different from the distribution ratio for the hot water supply operation, and the process proceeds to S13. The initial distribution ratio is set to reduce the drop in the warm air temperature of the warm air heater and to enable the warm hot water to be supplied as soon as possible, and is set, for example, to be distributed to the circulation passage 9 side: first bypass passage 11 side 3: 7.

next, in S13, the initial dispensing ratio of the first dispensing valve 15 adjusted in S12 is maintained for a predetermined time (for example, 10 seconds), and the process proceeds to S14. The predetermined time can be set as appropriate, for example, based on the time required until hot water at a temperature close to the set hot water supply temperature is supplied from the hot water supply passage 21.

Next, at S14, the distribution ratio is adjusted so that the distribution ratio on the side of the circulation passage 9 at the initial distribution ratio is set to the lower limit, and the distribution ratio of the first distribution valve 15 is adjusted in accordance with the hot water supply required capacity and the heating required capacity, and the process proceeds to S15. The hot water supply required capacity is the following heating capacity: corresponds to the amount of heat calculated based on the hot water supply flow rate detected by the flow rate sensor 25, the temperature of the incoming water detected by the incoming water temperature sensor 26, and the hot water supply set temperature. The heating demand capacity is the following heating capacity: corresponds to the amount of heat calculated based on the heating medium flow rate detected by the built-in pump 10, the heating medium return temperature detected by the first temperature sensor 12, and the heating medium target temperature.

Even when the required hot water supply capacity is large, the amount of heat corresponding to at least the distribution ratio on the circulation passage 9 side at the initial distribution ratio among the amounts of heat supplied by the heating hot water supply device 2 is ensured for the air heater.

Next, in S15, it is determined whether or not the hot water supply is completed. If it is determined as yes, the operation returns to the original heating operation, and if it is determined as no, the operation returns to S14 to continue the heating hot water supply simultaneous operation.

On the other hand, when the heating terminal 3 is not the hot air heater, the first distribution valve 15 is adjusted to the distribution ratio for hot water supply operation in S16, and the process proceeds to S17. The distribution ratio for hot water supply operation is a distribution ratio at which the entire amount of the heated heating medium is supplied to the first bypass passage 11, and therefore, heat is not supplied to the heating cycle circuit 4, but heating is continued by heat accumulated in the heating medium circulating in the terminal cycle circuit portion 4 a.

Next, in S17, the distribution ratio for hot water supply operation of the first distribution valve 15 adjusted in S16 is maintained for the same predetermined time as in S13, and the process proceeds to S18. Next, at S18, the distribution ratio of the first distribution valve 15 is adjusted according to the heating demand capacity and the hot water supply demand capacity, and the process proceeds to S19. When the required hot water supply capacity is large, the distribution ratio for the hot water supply operation may be maintained. Next, in S19, it is determined whether or not the hot water supply is finished. If it is determined as yes, the operation returns to the original heating operation, and if it is determined as no, the operation returns to S18 to continue the heating hot water supply simultaneous operation. Note that, S11 may be a determination step of whether or not the heating terminal 3 is a heating method in which air is forcibly convected, and distribution ratio control may be performed according to the heating method.

The operation and effect of the heating hot water supply apparatus 2 of example 2 will be described.

When the heating terminal 3 performing heating is not the hot air heating machine when the heating operation is shifted to the simultaneous heating and hot water supply operation, the first distribution valve 15 is adjusted from the distribution ratio for heating operation to the distribution ratio for hot water supply operation, and the hot water supply operation is prioritized. When the heating terminal 3 performing heating is the hot air heater when the heating operation is shifted to the simultaneous heating and hot water supply operation, the first distribution valve 15 is adjusted from the distribution ratio for heating operation to the initial distribution ratio specified by the apparatus different from the distribution ratio for hot water supply operation so that the heating medium is supplied to each of the hot water supply side and the heating side. In this way, the heating medium larger than the hot water supply operation distribution ratio can be supplied to the hot air heater, and the temperature drop of the hot air can be alleviated.

As described above, when the heating operation is shifted to the simultaneous heating and hot water supply operation, the first distribution valve 15 is adjusted to the distribution ratio corresponding to the type of the heating terminal 3 by utilizing the difference in the influence of the decrease in the amount of supply heat depending on the type of the heating terminal 3, thereby preferentially supplying hot water, avoiding the uncomfortable feeling for the hot water supply user, and reducing the fear of the discomfort for the heating user.

At the beginning of the transition from the heating operation to the heating hot water supply simultaneous operation, after a predetermined time has elapsed in a state where the first distribution valve 15 is adjusted at the initial distribution ratio or in a state where the first distribution valve 15 is adjusted at a distribution ratio that gives priority to the hot water supply operation, the first distribution valve 15 is adjusted in accordance with the heating demand capacity required for the heating operation and the hot water supply demand capacity required for the hot water supply operation. Therefore, after a predetermined time has elapsed from the shift to the simultaneous heating and hot water supply operation, heat can be supplied to the heating terminal 3, and thus the possibility of giving a heating user a sense of discomfort can be reduced.

When the heating terminal 3 for heating is the warm air heater, even when the hot water supply required capacity is large, the heat amount to be supplied to the warm air heater can be secured by maintaining at least the distribution ratio on the circulation passage 9 side at the initial distribution ratio. Therefore, it is possible to suppress a drop in temperature of the warm air sent from the warm air heater, and reduce the possibility of giving a heating user a sense of discomfort.

When the operation for starting the heating operation is performed during the hot water supply operation, since the hot water is supplied preferentially, the heating operation may not be started until the hot water supply is completed, or the operation may be shifted to the simultaneous heating and hot water supply operation. When the operation shifts to the heating hot water supply simultaneous operation, the combustion amount of the combustion unit 7 is increased, and the first distribution valve 15 is adjusted so as to supply the heating medium to the circulation passage 9 side while maintaining the amount of heat supplied to the first bypass passage 11 side corresponding to the hot water supply demand capacity.

In addition, as the heating terminal 3, when the warm air heater is mixed with a radiator or the like, the first distribution valve 15 is adjusted in the same manner as in the case of the warm air heater in the heating terminal 3, but if the blower of the warm air heater is not driven, the same control as in the case where the heating terminal 3 is not the warm air heater may be performed.

Further, those skilled in the art can implement the embodiments by adding various modifications to the embodiments without departing from the gist of the present invention, and the present invention includes the modifications.

Description of the symbols

1: warm water heating system

2: heating hot water supply device

3: heating terminal

4: heating circulation loop

5: external pump

7: combustion part (combustion element)

8: heat exchanger

9: circulation path

10: built-in pump (circulation element)

11: first bypass passage (bypass passage)

12: first temperature sensor (temperature detecting element)

15: first distribution valve (distribution element)

16: control section (control element)

19: water supply passage

20: heat exchanger for hot water supply

21: hot water supply passage

C1: confluence part