阅读说明：本技术 一种使用制冷剂作为地暖的多联机除霜控制方法 (Multi-online defrosting control method using refrigerant as floor heating ) 是由 侯丽峰 袁晓军 凌拥军 高嵩 于 2021-01-21 设计创作，主要内容包括：本发明公开了一种使用制冷剂作为地暖的多联机除霜控制方法,在地暖系统工作对室内进行供热时,对室外机的换热器是否满足除霜进入条件进行判断,若满足,则进行除霜,除霜持续2-5分钟后,判断是否满足二次除霜条件,若满足,则进行二次除霜,除霜过程中判断是否满足除霜退出条件,若满足,则退出除霜,室外机和地暖系统恢复除霜前的状态。本发明除霜过程通过打开压缩机喷气口的电磁阀,同时打开其中一个室内地暖系统对应的地暖系统电子膨胀阀和相连的地暖系统电磁阀参与除霜,其余室内地暖系统电子膨胀阀及地暖系统电磁阀暂时关闭；这样可以把系统内多余的制冷剂储存到里面,除霜过程在保证多联机正常除霜同时,又可以防止大量制冷剂回到室外机。(The invention discloses a multi-online defrosting control method using a refrigerant as floor heating, which comprises the steps of judging whether a heat exchanger of an outdoor unit meets defrosting entry conditions when a floor heating system works to supply heat indoors, defrosting if the heat exchanger of the outdoor unit meets the defrosting entry conditions, judging whether secondary defrosting conditions are met after defrosting lasts for 2-5 minutes, performing secondary defrosting if the heat exchanger of the outdoor unit meets the secondary defrosting entry conditions, judging whether defrosting exit conditions are met in the defrosting process, and exiting defrosting if the defrosting exit conditions are met, and recovering the outdoor unit and the floor heating system to be in a state before defrosting. In the defrosting process, the electromagnetic valve of the air nozzle of the compressor is opened, the floor heating system electronic expansion valve corresponding to one indoor floor heating system and the connected floor heating system electromagnetic valve are opened to perform defrosting, and the other indoor floor heating system electronic expansion valves and the floor heating system electromagnetic valves are temporarily closed; therefore, redundant refrigerant in the system can be stored in the system, and the defrosting process can prevent a large amount of refrigerant from returning to the outdoor unit while ensuring the normal defrosting of the multi-split air conditioner.)

1. The multi-split defrosting control method using the refrigerant as the floor heating is characterized by comprising an outdoor unit (1) and at least one floor heating system (2), wherein a refrigerant inlet of the floor heating system (2) is connected with a refrigerant outlet of the outdoor unit (1), one end of a refrigerant outlet of the floor heating system (2) is connected with a refrigerant inlet of the outdoor unit (1) through a floor heating system electronic expansion valve (3), one end of a refrigerant inlet of the floor heating system (2) is connected with a refrigerant outlet of the outdoor unit (1) through a floor heating system electromagnetic valve (4), and the defrosting control method comprises the following steps: when the floor heating system (2) works to supply heat indoors, whether a heat exchanger of the outdoor unit (1) meets defrosting entry conditions is judged, if yes, defrosting is conducted, the outdoor unit (1) is controlled to be switched into a refrigerating mode, meanwhile, an electronic expansion valve and an electromagnetic valve of a compressor air nozzle of the outdoor unit (1) are opened, an electronic expansion valve (3) of the floor heating system and an electromagnetic valve (4) of the floor heating system of any one floor heating system (2) are opened, electronic expansion valves (3) of the floor heating systems and electromagnetic valves (4) of the floor heating systems of the other floor heating systems (2) are closed, after defrosting lasts for 2-5 minutes, whether secondary defrosting conditions are met is judged, if yes, an electronic expansion valve (3) of the floor heating system of the second floor heating system (2) and the corresponding electromagnetic valve (4) of the floor heating system are opened for secondary defrosting, and whether defrosting, and if so, the defrosting is quitted, and the outdoor unit (1) and the floor heating system (2) recover the state before the defrosting.

2. A multi-on-line defrost control method using refrigerant as floor heating as claimed in claim 1, wherein the defrost entering conditions are: if the compressor continuously operates for 6-14min, defrosting is carried out when the following conditions are met: (1) simultaneously, the following conditions are met: the outer ring of T is more than or equal to 0 ℃; ② the frost formation of T is detected to be less than-7 ℃ continuously for 1 min; the accumulated heating running time of the compressor is more than or equal to 40-50 min; (2) simultaneously, the following conditions are met: firstly, the outer ring of T is more than or equal to minus 5 ℃ and less than 0 ℃; ② frost T is detected to be less than the outer ring of T plus minus 9 ℃ continuously for 1 min; the accumulated heating running time of the compressor is more than or equal to 40-50 min; (3) simultaneously, the following conditions are met: the outer ring of T is less than-5 ℃; ② frost T is detected to be less than the external ring of T + -15 ℃ continuously for 3 min; and thirdly, the accumulated heating running time of the compressor is more than or equal to 40-50 min.

3. A multi-split defrosting control method using refrigerant as floor heating as claimed in claim 1, wherein the secondary defrosting conditions are: the exhaust temperature is more than or equal to 90 ℃, the high-pressure of the system is less than or equal to 20bar, and the low-pressure of the system is less than or equal to 2 bar.

4. A multi-split defrosting control method using refrigerant as floor heating as set forth in claim 1, wherein the defrosting exit condition is: when any one of the following conditions is satisfied, the defrosting is withdrawn: (1) when the T defrosting temperature is detected to be more than 6 ℃ after lasting for 5 minutes, closing the floor heating system electronic expansion valve (3) of one floor heating system (2) and the floor heating system electromagnetic valve (4) of the branch; judging again, if the defrosting temperature T is more than 10 ℃ after 6 minutes, quitting, and then closing the compressor, the floor heating system electronic expansion valve (3) corresponding to the opened floor heating system (2) and the corresponding floor heating system electromagnetic valve (4); (2) if the P high-pressure is detected to be more than 22bar after the duration of 3 minutes, closing the floor heating system electronic expansion valve (3) of one floor heating system (2) and the electromagnetic valve (4) of the branch; judging again, if the P high-pressure is more than 25ba after 5 minutes, exiting, and then closing the compressor, the floor heating system electronic expansion valve (3) of the opened floor heating system (2) and the corresponding floor heating system electromagnetic valve (4).

Technical Field

The invention relates to a multi-online defrosting control method using a refrigerant as floor heating.

Background

The system has no feeling of heating and warming people in winter, is very comfortable and does not occupy any space. The air-conditioning diseases caused by using the conventional air-conditioning system are avoided.

Compared with the traditional fan coil, the capillary network plane radiation type air conditioning system has no indoor moving part, can not generate any indoor noise, and is the quietest air conditioning system.

However, as a novel comfortable and quiet heating system, the technical difficulty is very high, if the system is used for a multi-split system, the technical difficulty is higher, the larger the floor heating laying area is, the more additional refrigerant is, and the liquid return is very easy to cause in the multi-split defrosting process so as to damage the compressor.

Disclosure of Invention

In order to solve the problems, the invention provides a multi-online defrosting control method using a refrigerant as a floor heating system, which effectively solves the problems pointed out in the background art.

The technical scheme adopted by the invention is as follows:

a multi-split defrosting control method using a refrigerant as floor heating comprises an outdoor unit and at least one floor heating system, wherein a refrigerant inlet of the floor heating system is connected with a refrigerant outlet of the outdoor unit, one end of a refrigerant outlet of the floor heating system is connected with a refrigerant inlet of the outdoor unit through an electronic expansion valve of the floor heating system, one end of a refrigerant inlet of the floor heating system is connected with a refrigerant outlet of the outdoor unit through a solenoid valve of the floor heating system, and the defrosting control method comprises the following steps: when the floor heating system works to supply heat to the indoor space, whether the heat exchanger of the outdoor unit meets defrosting entry conditions is judged, if yes, defrosting is carried out, the outdoor unit is controlled to be converted into a refrigeration mode, an electronic expansion valve and an electromagnetic valve of a compressor air nozzle of the outdoor unit are opened, an electronic expansion valve and an electromagnetic valve of a floor heating system of any floor heating system are opened, electronic expansion valves and electromagnetic valves of floor heating systems of other floor heating systems are closed, after defrosting lasts for 2-5 minutes, whether secondary defrosting conditions are met or not is judged, if yes, and opening the electronic expansion valve of the floor heating system of the second floor heating system and the corresponding electromagnetic valve of the floor heating system to perform secondary defrosting, judging whether a defrosting exit condition is met or not in the defrosting process, if so, exiting the defrosting, and recovering the outdoor unit and the floor heating system to the state before defrosting.

Preferably, the defrosting entry condition is: if the compressor continuously operates for 6-14min, defrosting is carried out when the following conditions are met: 1 simultaneously satisfies the following conditions: the outer ring of T is more than or equal to 0 ℃; ② the frost formation of T is detected to be less than-7 ℃ continuously for 1 min; the accumulated heating running time of the compressor is more than or equal to 40-50 min; 2 simultaneously satisfying the following conditions: firstly, the outer ring of T is more than or equal to minus 5 ℃ and less than 0 ℃; ② frost T is detected to be less than the outer ring of T plus minus 9 ℃ continuously for 1 min; the accumulated heating running time of the compressor is more than or equal to 40-50 min; 3 simultaneously satisfying the following conditions: the outer ring of T is less than-5 ℃; ② frost T is detected to be less than the external ring of T + -15 ℃ continuously for 3 min; and thirdly, the accumulated heating running time of the compressor is more than or equal to 40-50 min.

Preferably, the secondary defrosting conditions are as follows: the exhaust temperature is more than or equal to 90 ℃, the high-pressure of the system is less than or equal to 20bar, and the low-pressure of the system is less than or equal to 2 bar.

Preferably, the defrosting exit condition is as follows: when any one of the following conditions is satisfied, the defrosting is withdrawn: 1, after lasting for 5 minutes, detecting that the T defrosting temperature is higher than 6 ℃, and closing an electronic expansion valve of the floor heating system of one floor heating system and a solenoid valve of the floor heating system of the branch; judging again, if the defrosting temperature T is more than 10 ℃ after 6 minutes, quitting, and then closing the compressor, the floor heating system electronic expansion valve corresponding to the opened floor heating system and the corresponding floor heating system electromagnetic valve; 2, after lasting for 3 minutes, if the P high-pressure is detected to be more than 22bar, closing the electronic expansion valve of the floor heating system of one floor heating system and the electromagnetic valve of the branch; judging again, if the P high-pressure is more than 25ba after 5 minutes, exiting, and then closing the compressor, the started electronic expansion valve of the floor heating system and the corresponding electromagnetic valve of the floor heating system.

In the defrosting process, the electromagnetic valve of the air nozzle of the compressor is opened, the floor heating system electronic expansion valve corresponding to one indoor floor heating system and the connected floor heating system electromagnetic valve are opened to perform defrosting, and the other indoor floor heating system electronic expansion valves and the floor heating system electromagnetic valves are temporarily closed; therefore, redundant refrigerant in the system can be stored in the system, and the defrosting process can ensure the normal defrosting of the multi-split air conditioner and prevent a large amount of refrigerant from returning to the outdoor unit; meanwhile, the capillary refrigerant which does not participate in the indoor floor heating system can not be cooled, so that the heat of the floor can not be greatly reduced, and the comfort of life is improved.

When frosting is serious, two floor heating systems can be adopted for defrosting, and the opening degree of the electronic expansion valve of the floor heating systems is controlled when the two floor heating systems are defrosted, so that efficient defrosting is guaranteed, and meanwhile, a large amount of refrigerants can be prevented from entering an outdoor unit.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

The invention is described in further detail below with reference to specific embodiments and with reference to the attached drawings.

Example 1

As shown in fig. 1, a multi-split defrosting control method using a refrigerant as a floor heating system includes an outdoor unit 1 and at least one floor heating system 2, a refrigerant inlet of the floor heating system 2 is connected to a refrigerant outlet of the outdoor unit 1, one end of a refrigerant outlet of the floor heating system 2 is connected to a refrigerant inlet of the outdoor unit 1 through a floor heating system electronic expansion valve 3, one end of a refrigerant inlet of the floor heating system 2 is connected to a refrigerant outlet of the outdoor unit 1 through a floor heating system electromagnetic valve 4, and the defrosting control method includes: when the floor heating system 2 works to supply heat indoors, whether a heat exchanger of the outdoor unit 1 meets defrosting entry conditions is judged, if yes, defrosting is carried out, the outdoor unit 1 is controlled to be switched into a refrigeration mode, meanwhile, an electronic expansion valve to 60P and an electromagnetic valve of a compressor air nozzle of the outdoor unit 1 are opened, floor heating system electronic expansion valves 3 to 350P and floor heating system electromagnetic valves 4 of any floor heating system 2 are opened, floor heating system electronic expansion valves 3 and floor heating system electromagnetic valves 4 of the rest floor heating systems 2 are closed, after defrosting lasts for 2-5 minutes, whether secondary defrosting conditions are met is judged, if yes, floor heating system electronic expansion valves 3 to 200P of the second floor heating system 2 and corresponding floor heating system electromagnetic valves 4 are opened to carry out secondary defrosting, whether defrosting exit conditions are met is judged in the defrosting process, and if yes, defrosting is exited, and the outdoor unit 1 and the floor heating system 2 recover the state before defrosting.

The defrosting entry conditions are as follows: if the compressor continuously operates for 6-14min, defrosting is carried out when the following conditions are met: 1 simultaneously satisfies the following conditions: the outer ring of T is more than or equal to 0 ℃; ② the frost formation of T is detected to be less than-7 ℃ continuously for 1 min; the accumulated heating running time of the compressor is more than or equal to 40-50 min; 2 simultaneously satisfying the following conditions: firstly, the outer ring of T is more than or equal to minus 5 ℃ and less than 0 ℃; ② frost T is detected to be less than the outer ring of T plus minus 9 ℃ continuously for 1 min; the accumulated heating running time of the compressor is more than or equal to 40-50 min; 3 simultaneously satisfying the following conditions: the outer ring of T is less than-5 ℃; ② frost T is detected to be less than the external ring of T + -15 ℃ continuously for 3 min; cumulative heating running time of compressor is not less than

40-50min。

The secondary defrosting conditions are as follows: the exhaust temperature is more than or equal to 90 ℃, and the high pressure of the system is less than or equal to

20bar and the low pressure of the system is less than or equal to 2 bar.

The defrosting exit condition is as follows: when any one of the following conditions is satisfied, the defrosting is withdrawn: 1, after lasting for 5 minutes, detecting that the T defrosting temperature is higher than 6 ℃, and closing an electronic expansion valve 3 of the floor heating system of one floor heating system 2 and an electromagnetic valve 4 of the floor heating system of the branch; judging again, if the defrosting temperature T is more than 10 ℃ after 6 minutes, quitting, and then closing the compressor, the floor heating system electronic expansion valve 3 corresponding to the opened floor heating system 2 and the corresponding floor heating system electromagnetic valve 4; 2, after lasting for 3 minutes, if the P high-pressure is detected to be more than 22bar, closing the electronic expansion valve 3 of the floor heating system 2 and the electromagnetic valve 4 of the branch; judging again, if the P high-pressure is more than 25ba after 5 minutes, exiting, and then closing the compressor, the floor heating system electronic expansion valve 3 of the floor heating system 2 which is opened and the corresponding floor heating system electromagnetic valve 4.

Finally, it should be noted that the above-mentioned list is only the specific embodiment of the present invention. Obviously, the present invention is not limited to the above embodiments, and many modifications are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.