阅读说明：本技术 一种基于地埋管地源热泵的空气处理系统及方法 (Air treatment system and method based on buried pipe ground source heat pump ) 是由 李鑫 章明友 邢滕 李富强 乔雷 付金亭 王京 于 2021-08-03 设计创作，主要内容包括：本发明公开了一种基于地埋管地源热泵的空气处理系统及方法,本发明的系统包括地埋管换热组件、地源热泵组件和空气处理组件,所述地埋管换热组件包括地埋管换热器,新风热交换设备与混合空气热交换设备之间间隔设置,且输送管道上位于新风热交换设备与混合空气热交换设备之间设置有回风口,所述地埋管换热器、地源热泵机组和新风热交换设备组成第一循环管路,所述混合空气热交换设备与地源热泵组件之间设置有第二循环管路。本发明将地源热直接用于承担室外新风的全部显热负荷和部分潜热负荷,热泵机组仅需承担室内负荷,从而减少热泵机组所需要的制冷/制热量,热泵机组的耗电量也相应减少,从整体上有效利用了低品位地热能和节省了高品位电能。(The system comprises a ground heat exchange assembly, a ground heat pump assembly and an air treatment assembly, wherein the ground heat exchange assembly comprises a ground heat exchanger, fresh air heat exchange equipment and mixed air heat exchange equipment are arranged at intervals, an air return port is arranged on a conveying pipeline and positioned between the fresh air heat exchange equipment and the mixed air heat exchange equipment, the ground heat exchanger, the ground heat pump assembly and the fresh air heat exchange equipment form a first circulation pipeline, and a second circulation pipeline is arranged between the mixed air heat exchange equipment and the ground heat pump assembly. The invention directly uses the ground source heat to bear all sensible heat load and partial latent heat load of outdoor fresh air, and the heat pump unit only needs to bear indoor load, thereby reducing the refrigeration/heating quantity required by the heat pump unit, correspondingly reducing the power consumption of the heat pump unit, effectively utilizing low-grade geothermal energy as a whole and saving high-grade electric energy.)

1. An air treatment system based on a buried pipe ground source heat pump is characterized in that: including buried pipe heat exchange assembly, ground source heat pump subassembly and air treatment subassembly, buried pipe heat exchange assembly includes buried pipe heat exchanger, the air treatment subassembly includes pipeline and sets gradually new trend heat exchange equipment, mixed air heat exchange equipment, the air supply mechanism in pipeline along the air current direction of delivery, pipeline's air inlet end is provided with the new trend entry, and pipeline's air-out end is provided with the supply-air outlet, and the interval sets up between new trend heat exchange equipment and the mixed air heat exchange equipment, and lies in on the pipeline and be provided with the return air inlet between new trend heat exchange equipment and the mixed air heat exchange equipment, buried pipe heat exchanger, ground source heat pump set and new trend heat exchange equipment constitute first circulation pipeline, be provided with the second circulation pipeline between mixed air heat exchange equipment and the ground source heat pump subassembly.

2. The air processing system based on the buried pipe ground source heat pump as claimed in claim 1, wherein: ground source heat pump assembly includes compressor, first heat exchanger, second heat exchanger and choke valve, first heat exchanger, choke valve and second heat exchanger constitute the third circulation pipeline, first heat exchanger and second heat exchanger are one of them of evaporimeter and condenser, and first heat exchanger and second heat exchanger are inequality, the compressor is parallelly connected to the circulation pipeline that first heat exchanger and second heat exchanger are connected through four-way reversing valve in, induced draft heat exchange equipment's liquid outlet is connected to first heat exchanger's inlet, and first heat exchanger's liquid outlet is connected to the liquid return mouth of buried pipe heat exchanger, mixed air heat exchange equipment with constitute between the second heat exchanger heat exchange circulation pipeline.

3. The air processing system based on the buried pipe ground source heat pump as claimed in claim 1, wherein: the buried pipe heat exchanger is provided with a plurality of groups, each group is arranged at different ground sources, each group comprises a plurality of groups of U-shaped heat exchange pipes, heat exchange fins are arranged on the U-shaped heat exchange pipes, one ends of the U-shaped heat exchange pipes are inlets, the other ends of the U-shaped heat exchange pipes are openings, and the U-shaped heat exchange pipes of all the buried pipe heat exchangers form the same liquid inlet and the same liquid outlet.

4. The air processing system based on the buried pipe ground source heat pump as claimed in claim 2, wherein: and a humidifier is arranged behind the mixed air heat exchange equipment and is provided with a control switch which is independently turned on and off.

5. The air processing system based on the buried pipe ground source heat pump as claimed in claim 2, wherein: a first circulating pump is arranged on a connecting pipe between a liquid outlet of the ground heat exchanger and a liquid inlet of the fresh air heat exchange device, and a second circulating pump is arranged on a circulating pipeline between the mixed air heat exchange device and the ground source heat pump assembly.

6. The air processing system based on the buried pipe ground source heat pump as claimed in claim 1, wherein: and a mixing cavity is arranged between the fresh air heat exchange equipment and the mixed air heat exchange equipment.

7. The air processing system based on the buried pipe ground source heat pump as claimed in claim 1, wherein: an air filter is provided at least on the front side of the humidifier.

8. An air treatment method based on a buried pipe ground source heat pump is characterized in that: the method comprises the following steps:

s1, collecting ground source cold/heat energy in underground soil;

s2, exchanging heat of the fresh air sent into the room through ground source heat, and cooling/heating the fresh air;

s3, sending the waste heat of the heat exchange of the fresh air into a heat pump unit for waste heat utilization;

s4, exchanging heat of the fresh air and the indoor return air after heat exchange through the heat pump unit, and cooling/heating the mixed air;

and S5, pressurizing and feeding the mixed air after heat exchange into the room.

9. The air processing method based on the buried pipe ground source heat pump according to claim 8, characterized in that: the heat pump unit comprises a first heat exchanger, a second heat exchanger and a compressor, wherein the first heat exchanger and the second heat exchanger are one of an evaporator and a condenser, and the first heat exchanger and the second heat exchanger do not belong to the same type;

the first heat exchanger, the second heat exchanger and the compressor form a first circulation pipeline, the fresh air heat exchange equipment, the first heat exchanger and the ground heat exchanger form a second circulation pipeline, and a third circulation pipeline is formed between the mixed air heat exchange equipment and the second heat exchanger.

10. The air processing method based on the buried pipe ground source heat pump according to claim 9, characterized in that: in step S4, when the phase chamber is in a heat supply state, the method further includes humidifying the mixed air by a humidifier, and the humidifying method is isothermal humidification or isenthalpic humidification.

Technical Field

The invention relates to the technical field of air conditioning refrigeration, in particular to an air treatment system and method based on a ground source heat pump of a buried pipe.

Background

The central air conditioner is mainly arranged in office buildings, shopping malls, hotels and scientific research institutions at present, is used for refrigerating in summer and heating in winter, a water-cooled refrigerator is used for preparing cold water with the temperature of 7-12 ℃ in summer, a boiler is used for preparing hot water with the temperature of 40-60 ℃ in winter, a terminal dissipates heat in a capillary tube and blowing mode, floating water and noise can be generated when a cooling tower serving as a refrigeration auxiliary device operates, a large amount of harmful gases such as CO2 and SO2 can be generated when the boiler is used for combustion in winter, the environment is polluted, the scheme is high in energy consumption, the system is complex to operate, and the operation cost is high. A small number of air-conditioning devices adopting an air-cooled heat pump process have high operation cost and poor reliability, and can aggravate the urban heat island effect.

There are also devices for producing cold and heat sources required in the central air-conditioning system by using the cold and heat of underground water, but the extraction of underground water is easy to cause pollution of underground water and reduction of underground water level, and does not meet the requirements of sustainable development strategy in China, so the application of the scheme is limited. For some existing ground source heat pump systems, in an air conditioning air duct system in a large building, an air handling unit needs to supplement a large amount of outdoor fresh air to carry cold/heat produced by the heat pump unit to adjust indoor air, and natural cold or heat stored underground is not directly used for cooling high-temperature outdoor fresh air or heating low-temperature outdoor fresh air, so that the loss of cold/heat of underground energy which can be directly used for refrigeration or heat supply originally is caused; because the total heat load of outdoor fresh air is borne by the heat pump unit, when the temperature difference between the indoor air and the outdoor air is large, the load borne by the heat pump unit is large, and the energy consumption is high.

Disclosure of Invention

The invention aims to overcome the defects, provides an air treatment system based on a buried pipe ground source heat pump, utilizes the temperature difference between an underground layer and the ground to provide cold or heat, saves energy, does not pollute the underground water, and also provides an air treatment method based on the buried pipe ground source heat pump by utilizing the system.

The technical scheme adopted by the invention is as follows:

an air processing system based on a buried pipe ground source heat pump comprises a buried pipe heat exchange assembly, a ground source heat pump assembly and an air processing assembly, the ground heat exchange assembly comprises a ground heat exchanger, the air processing assembly comprises a conveying pipeline, and a fresh air heat exchange device, a mixed air heat exchange device and an air supply mechanism which are sequentially arranged in the conveying pipeline along the air flow conveying direction, the air inlet end of the conveying pipeline is provided with a fresh air inlet, the air outlet end of the conveying pipeline is provided with an air supply outlet, the fresh air heat exchange equipment and the mixed air heat exchange equipment are arranged at intervals, and an air return opening is arranged on the conveying pipeline between the fresh air heat exchange equipment and the mixed air heat exchange equipment, the ground heat exchanger, the ground source heat pump unit and the fresh air heat exchange equipment form a first circulation pipeline, and a second circulating pipeline is arranged between the mixed air heat exchange equipment and the ground source heat pump assembly.

As a further optimization of the system, the ground source heat pump assembly comprises a compressor, a first heat exchanger, a second heat exchanger and a throttle valve, wherein the first heat exchanger, the throttle valve and the second heat exchanger form a third circulation pipeline, the first heat exchanger and the second heat exchanger are one of an evaporator and a condenser, the first heat exchanger and the second heat exchanger are different, the compressor is connected in parallel to the circulation pipeline connected with the first heat exchanger and the second heat exchanger through a four-way reversing valve, a liquid outlet of the air suction heat exchange device is connected to a liquid inlet of the first heat exchanger, a liquid outlet of the first heat exchanger is connected to a liquid return port of the buried pipe heat exchanger, and the mixed air heat exchange device and the second heat exchanger form the heat exchange circulation pipeline.

As a further optimization of the system, the ground heat exchanger is provided with a plurality of groups, each group is respectively arranged at different ground sources, each group of ground heat exchanger comprises a plurality of groups of U-shaped heat exchange tubes, heat exchange fins are arranged on the U-shaped heat exchange tubes, one ends of the U-shaped heat exchange tubes are inlets, the other ends of the U-shaped heat exchange tubes are openings, and the U-shaped heat exchange tubes of all the ground heat exchangers form the same liquid inlet and the same liquid outlet.

As a further optimization of the system, a humidifier is arranged behind the mixed air heat exchange device, and the humidifier is provided with a control switch which is independently turned on and off.

As a further optimization of the system, a first circulating pump is arranged on a connecting pipe between a liquid outlet of the ground heat exchanger and a liquid inlet of the fresh air heat exchange equipment, and a second circulating pump is arranged on a circulating pipeline between the mixed air heat exchange equipment and the ground source heat pump assembly.

As a further optimization of the system, a mixing cavity is arranged between the fresh air heat exchange device and the mixed air heat exchange device.

As a further optimization of the system, the invention provides an air filter at least at the front side of the humidifier.

The invention also provides an air treatment method based on the buried pipe ground source heat pump, which comprises the following steps:

s1, collecting ground source cold/heat energy in underground soil;

s2, exchanging heat of the fresh air sent into the room through ground source heat, and cooling/heating the fresh air;

s3, sending the waste heat of the heat exchange of the fresh air into a heat pump unit for waste heat utilization;

s4, exchanging heat of the fresh air and the indoor return air after heat exchange through the heat pump unit, and cooling/heating the mixed air;

and S5, pressurizing and feeding the mixed air after heat exchange into the room.

As a further optimization of the method, the ground heat exchanger is arranged to collect ground source cold/heat energy, fresh air sent into a room is cooled/heated through the fresh air heat exchange equipment, and mixed air is cooled/heated through the mixed air heat exchange equipment;

the first heat exchanger, the second heat exchanger and the compressor form a first circulation pipeline, the fresh air heat exchange equipment, the first heat exchanger and the ground heat exchanger form a second circulation pipeline, and a third circulation pipeline is formed between the mixed air heat exchange equipment and the second heat exchanger.

As a further optimization of the method of the present invention, in step S4 of the present invention, when the phase chamber is in a heat supply state, the method further includes humidifying the mixed air by a humidifier, and the humidifying method is isothermal humidification or isenthalpic humidification.

The invention has the following advantages:

1. the introduced fresh air is directly cooled by introducing the ground source heat, and the waste heat of the ground source heat is utilized by the heat pump unit, the ground source heat is directly used for bearing all sensible heat loads and part latent heat loads of the outdoor fresh air, and the heat pump unit only needs to bear indoor loads, so that the refrigeration/heating quantity required by the heat pump unit is reduced, the power consumption of the heat pump unit is correspondingly reduced, the low-grade geothermal energy is effectively utilized integrally, and the high-grade electric energy is saved;

2. the heat exchangers of the fresh air heat exchange equipment and the heat pump unit are both provided with underground cold and heat sources which are suddenly provided, the heat exchangers of the fresh air heat exchange equipment and the heat pump unit are firstly connected in series in a circulating pipeline of a ground source medium, the circulating medium carrying geothermal energy can pre-cool or preheat indoor and outdoor fresh air, and then the geothermal energy can be fully utilized in the heat exchanger for cooling or heating the driving and collapsing unit;

3. the system has the advantages of high efficiency, energy conservation, larger fresh air, more obvious energy-saving effect, safe and sanitary integral operation, no generation of other harmful substances, no underground water pollution and wide application range, and is particularly suitable for northern areas with hot summer and cold winter.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

The invention is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic view of the overall structure of the present invention;

figure 2 is an air psychrometric chart of the system of the present invention under refrigeration conditions;

figure 3 is an air psychrometric chart of the system of the present invention under a heating condition.

Wherein: 1. the system comprises a ground heat exchanger, 2, a first circulating pump, 3, a ground source heat pump unit, 4, the first heat exchanger, 5, a throttle valve, 6, a second heat exchanger, 7, a compressor, 8, a four-way reversing valve, 9, fresh air heat exchange equipment, 10, a mixing chamber, 11, mixed air heat exchange equipment, 12, a humidifier, 13, a fan, 14 and a second circulating pump.

Detailed Description

The present invention is further described in the following with reference to the drawings and the specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention, and the embodiments and the technical features of the embodiments can be combined with each other without conflict.

It is to be understood that the terms first, second, and the like in the description of the embodiments of the invention are used for distinguishing between the descriptions and not necessarily for describing a sequential or chronological order. The "plurality" in the embodiment of the present invention means two or more.

The term "and/or" in the embodiment of the present invention is only an association relationship describing an associated object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, B exists alone, and A and B exist at the same time. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.

The embodiment provides an air treatment system based on a ground heat pump, as shown in fig. 1, comprising a ground heat exchange assembly, a ground heat pump assembly 3 and an air treatment assembly, wherein the ground heat exchange assembly comprises a ground heat exchanger 1, the air treatment assembly comprises a conveying pipeline, and a fresh air heat exchange device 9, a mixed air heat exchange device 11 and an air supply mechanism which are sequentially arranged in the conveying pipeline along an air flow conveying direction, an air inlet of the conveying pipeline is provided with a fresh air inlet for absorbing fresh air from the outside, an air outlet of the conveying pipeline is provided with an air supply outlet for supplying air to the indoor, the fresh air heat exchange device 9 and the mixed air heat exchange device 11 are arranged at intervals, and an air return port is arranged on the conveying pipeline between the fresh air heat exchange device 9 and the mixed air heat exchange device 11, the air return opening is used for utilizing sucked indoor air to promote the flow of the indoor air and simultaneously utilizing the heat of the indoor air, a mixing cavity 10 is formed in the space between the fresh air heat exchange device and the mixed air heat exchange device, and the sucked outdoor fresh air and the sucked indoor return air are mixed and then cooled/heated through the mixed air heat exchange device. The ground source heat pump assembly comprises a compressor 7, a first heat exchanger 4, a second heat exchanger 6 and a throttle valve 5, the first heat exchanger 4, the throttle valve 5 and the second heat exchanger 6 form a third circulation pipeline, the first heat exchanger 4 and the second heat exchanger 6 are one of an evaporator and a condenser, and the first heat exchanger and the second heat exchanger are different, namely the arrangement form of the first heat exchanger 4 and the second heat exchanger 6 is mainly different from the working condition form thereof, when the ground source heat pump assembly is in a heating working condition, the first heat exchanger 4 is the evaporator, the second heat exchanger 6 is the condenser, when the ground source heat pump assembly is in a cooling working condition, the first heat exchanger 4 is the condenser, the second heat exchanger 6 is the evaporator, when the ground source heat pump assembly is actually arranged, the first heat exchanger 4 and the second heat exchanger 6 simultaneously comprise the evaporator and the condenser, and under different working conditions, the corresponding equipment is in a working state, and the structural form of the air conditioner can be specifically referred to. The compressor 7 is connected in parallel to a third circulation pipeline connected with the first heat exchanger 4 and the second heat exchanger 8 through a four-way reversing valve 8, the first circulation pipeline is composed of the first heat exchanger 4 and the ground heat exchanger 1 in the fresh air heat exchange device 9 and the ground source heat pump unit 3, a first circulation pump 2 is arranged on the first circulation pipeline, namely, a liquid outlet of the fresh air heat exchange device 1 is connected to a liquid inlet of the first heat exchanger 4, a liquid outlet of the first heat exchanger 4 is connected to a liquid return port of the ground heat exchanger 1, a second circulation pipeline is composed between the mixed air heat exchange device 11 and the second heat exchanger 6, and a second circulation pump 14 is arranged on the second circulation pipeline.

In this embodiment, a humidifier 12 is disposed behind the mixed air heat exchange device, and the humidifier 12 has a control switch that is independently turned on and off, so as to realize a humidification function under a heating condition.

In the embodiment, at least the air filter is arranged on the front side of the humidifier, the air filter can be used for filtering fresh air introduced outdoors and return air indoors, the cleanness of the air sent into the room again is guaranteed, and the filter can be arranged at the air inlet pipe opening and can also be arranged on the front side of the humidifier 12.

In order to achieve the required power, the ground heat exchanger 1 may be provided with multiple groups, each group is respectively arranged at different ground sources, and each group of the ground heat exchanger 1 includes multiple groups of U-shaped heat exchange tubes, heat exchange fins are arranged on the U-shaped heat exchange tubes, one ends of the U-shaped heat exchange tubes are inlets, the other ends of the U-shaped heat exchange tubes are openings, and the U-shaped heat exchange tubes of all the ground heat exchangers 1 form a same inlet and a same outlet.

Based on the above system, the present embodiment further provides an air processing method based on a ground source heat pump, including the following steps:

s1, collecting ground source cold/heat energy in underground soil;

s2, exchanging heat of the fresh air sent into the room through ground source heat, and cooling/heating the fresh air;

s3, sending the waste heat of the heat exchange of the fresh air into a heat pump unit for waste heat utilization;

s4, exchanging heat of the fresh air and indoor return air after heat exchange through the heat pump unit, cooling/heating the mixed air, and humidifying the mixed air through a humidifier when the phase room is in a heat supply state, wherein the humidifying method is isothermal humidification or isenthalpic humidification;

and S5, pressurizing and feeding the mixed air after heat exchange into the room.

In the embodiment, the ground heat exchanger 1 is arranged to collect ground source cold/heat energy, fresh air sent into a room is cooled/heated through the fresh air heat exchange device 9, and mixed air is cooled/heated through the mixed air heat exchange device 11, the heat pump unit 3 comprises a first heat exchanger 4, a second heat exchanger 6 and a compressor 7, the first heat exchanger 4 and the second heat exchanger 6 are one of an evaporator and a condenser, and the first heat exchanger 4 and the second heat exchanger 6 do not belong to the same type;

in the above, the first heat exchanger 4, the second heat exchanger 6 and the compressor 7 form a first circulation pipeline, the fresh air heat exchange device 9, the first heat exchanger 4 and the ground heat exchanger 1 form a second circulation pipeline, and a third circulation pipeline is formed between the mixed air heat exchange device 11 and the second heat exchanger 6.

When the system works, outdoor fresh air is treated by the fresh air heat exchange device 9, enters the mixing cavity 10 to be mixed with indoor return air, is treated by the mixed air heat exchange device 11, is pressurized by the fan 13 and is sent into an air-conditioning room. Under the working condition of cooling, the fresh air is cooled and dehumidified in the process of heat and mass exchange of the outdoor fresh air and the fresh air heat exchange equipment 9, the mixed air consisting of the fresh air and the return air is also cooled and dehumidified in the process of heat and mass exchange of the mixed air and the mixed air heat exchange equipment 11, the fresh air heat exchange equipment 9 bears the whole sensible heat load and part latent heat load of the outdoor fresh air, the cold energy required by the fresh air heat exchange equipment 9 is provided by underground soil, the mixed air heat exchange equipment 11 bears the part latent heat load of the outdoor fresh air and the total indoor cold load, and the cold energy required by the mixed air heat exchange equipment 11 is provided by the ground source heat pump unit 3; under the working condition of heat supply, the fresh air is subjected to equal-humidity heating or humidification heating in the heat exchange process of the outdoor fresh air and fresh air heat exchange equipment 9, the mixed air consisting of the fresh air and the return air and the mixed air heat exchange equipment 11 are subjected to equal-humidity heating or humidification heating in the heat and mass exchange process, the fresh air heat exchange equipment 9 bears the heat load of the outdoor fresh air part, the heat required by the fresh air heat exchange equipment 9 is provided by underground soil, the mixed air heat exchange equipment 11 bears the heat load of the outdoor fresh air part and the total heat load of the indoor, and the heat required by the mixed air heat exchange equipment 11 is provided by the heat pump unit 3; the humidifying method of the humidifier 12 adopts isothermal humidification or isenthalpic humidification.

The first medium in the fresh air heat exchange equipment 9 and the fresh air are subjected to heat and mass exchange and then enter a condenser 4 of the heat pump unit 3 for heat exchange, then flow into the ground heat exchanger 1 to exchange heat with soil, and then are sent back to the fresh air heat exchange equipment 9 again through the first circulating pump 2. Under the cold supply working condition, the first medium with higher temperature is changed into the first medium with lower temperature after releasing heat to the low-temperature soil in the geothermal heat exchanger 1, the temperature of the first medium flowing into the fresh air heat and mass exchange device 9 is lower than the dew point temperature of fresh air, so that the fresh air is cooled and dehumidified, and the first medium enters the condenser 4 of the heat pump unit 3 to continuously absorb heat after absorbing heat through the fresh air heat and mass exchange device 9 and then continuously rises in temperature. The first medium with higher temperature is changed at the outlet of a first heat exchanger (condenser) 4 of the ground source heat pump unit 3; under the working condition of heat supply, the first medium with lower temperature absorbs heat from high-temperature soil in the buried pipe heat exchanger 1 and then becomes the first medium with higher temperature, the temperature of the first medium flowing into the fresh air heat exchange device 9 is higher than that of the fresh air so as to realize fresh air heating, the first medium enters the first heat exchanger (evaporator) 4 of the ground source heat pump unit 3 after releasing heat through the fresh air heat exchange device 9 to continue to release heat, the temperature of the first medium is continuously reduced, and the first medium with lower temperature is changed into the first medium at the outlet of the first heat exchanger (evaporator) 4 of the ground source heat pump unit 3.

The second medium in the mixed air heat exchange device 11 and the mixed air formed by the fresh air and the return air are subjected to heat and mass exchange, then enter the second heat exchanger (evaporator) 6 of the ground source heat pump unit 3 for heat exchange, and then are sent to the mixed air heat exchange device 11 again through the second circulating pump 14. Under the working condition of cooling, the temperature of the second medium in the mixed air heat and mass exchange equipment 11 is far lower than the dew point temperature of the mixed air so as to realize cooling and dehumidification of the mixed air, the temperature of the second medium is increased after the second medium absorbs heat through the mixed air heat exchange equipment 11, and the second medium enters a second heat exchanger (evaporator) 6 of the ground source heat pump unit 3 to be cooled to be low-temperature second medium after the second medium releases heat; under the working condition of heat supply, the temperature of the second medium in the mixed air heat and mass exchange equipment 11 is far higher than that of the mixed air, so that the mixed air is heated, the temperature of the second mixed medium is reduced after the second mixed medium emits heat through the mixed air heat exchange equipment 11, and the second mixed medium enters the second heat exchanger (evaporator) 6 of the heat pump unit 3, is increased after absorbing the heat and is heated into the high-temperature second medium.

Taking the case that the fresh air heat exchange device 9 and the mixed air heat and mass exchange device 11 are indirect contact heat and mass exchange devices, and the description is made by combining the psychrometric charts of fig. 2 and fig. 3, the air treatment process is as follows: under the cooling condition, the outdoor fresh air is firstly cooled and dehumidified by the fresh air heat exchange device 9 to reach the mechanical dew point (as shown in the state point O to the state point L of the fresh air in fig. 2)₁Process), fresh air and return air are mixed in the mixing chamber 10 (process of mixing the indoor state point R and the fresh air mechanical dew point L1 to the air state point M as shown in fig. 2), and the mixed air is cooled and dehumidified to the mechanical dew point in the mixed air heat exchange device 11 (process of mixing the state point M to the state point L as shown in fig. 2)₂Process), the treated air is sent into the room by a fan to eliminate the residual heat and the residual humidity of the room (as shown in the air state point L in figure 2)₂To state point R process) to maintain room temperature and humidity stable (as shown in fig. 2 as air state point R); under the working condition of heat supply, outdoor fresh air is firstly subjected to wet heating by a fresh air heat exchange device 9 and the like (in the process from a fresh air state point O 'to a state O' shown in figure 3), the fresh air and the return air are mixed in a mixture 10 (in the process from an indoor air state point R and a fresh air state point O 'shown in figure 3 to an air state point M'), and the mixed air is subjected to mixed air heat exchange device 11 and the likeWet heating (state point M, to state point M "process shown in fig. 3), then the mixed air is isothermally humidified by the humidifier 8 (mixed air state point M" to air supply state point s process shown in fig. 3), and the humidified air is supplied into the room by the fan to maintain the room temperature and humidity stable (air supply state point s to room air state point R process shown in fig. 3).

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.