Compound heat recovery type double cold source air conditioning unit

Abstract

The application discloses a composite heat recovery type double cold source air conditioning unit, and belongs to the technical field of air conditioners. An air treatment module comprises a preliminary treatment zone and a deep treatment zone. An exhaust air heat recovery function module is used for heat exchange of exhaust air. The exhaust air heat recovery function module is connected with a liquid circulation module through a pipeline. The liquid circulation module is connected with the preliminary treatment zone through a pipeline. The preliminary treatment zone exchanges heat with the exhaust air heat recovery function module through the liquid circulation module. A heat pump module is connected with the deep treatment zone through a pipeline. Heat exchange may exist between the heat pump module and the liquid circulation module. Through the application, the air treatment module is arranged to form a hierarchical treatment structure of the preliminary treatment zone and the deep treatment zone. The air is pre-treated and deeply treated. The air can be pre-cooled or pre-heated before entering the deep dehumidification. The subsequent treatment load is reduced. The problems of serious temperature and humidity coupling treatment and low module energy efficiency are solved.

Description

Technical Field

[0001] This invention relates to a composite heat recovery type dual-cooling-source air conditioning unit, belonging to the field of air conditioning technology. Background Technology

[0002] With the increasing demands for air quality in industrial production environments, public buildings, and high-standard clean spaces, air handling equipment needs to not only possess basic cooling or heating functions but also simultaneously achieve multiple functions such as efficient dehumidification, precise temperature control, and optimized energy utilization. Therefore, in these application environments, a composite air handling unit that can simultaneously handle air dehumidification, temperature regulation, and exhaust energy recovery is typically required to improve module operating efficiency and reduce energy consumption.

[0003] In existing technologies, common air dehumidification and treatment methods mainly include condensation dehumidification, which results in coupled temperature and humidity processing, low energy efficiency, and insufficient dehumidification capacity in high-temperature and high-humidity environments. Furthermore, a large amount of energy from exhaust air is directly released, leading to energy waste. While existing technologies attempt to introduce heat pumps or heat recovery devices, it is often difficult to coordinate the matching relationship between dehumidification, cooling, and exhaust air energy recovery, resulting in low module integration and poor operational stability.

[0004] Therefore, a composite heat recovery type dual-cooling-source air conditioning unit was designed to solve the above problems. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a composite heat recovery type dual-cooling-source air conditioning unit, which solves the problems of low energy efficiency, insufficient dehumidification capacity under high temperature and high humidity conditions, and energy waste.

[0006] The technical problem to be solved by this invention is achieved by the following technical solution: a composite heat recovery type dual-cooling-source air conditioning unit, characterized in that:

[0007] include

[0008] An air handling module includes a preliminary treatment zone and a deep treatment zone. Air entering the air handling module first passes through the preliminary treatment zone and then through the deep treatment zone. The preliminary treatment zone pre-treats the air by heating or cooling, and the deep treatment zone condenses and heats or cools the pre-treated air.

[0009] An exhaust heat recovery module is used for heat exchange in exhaust air, and the exhaust heat recovery module is connected to a liquid circulation module through a pipe.

[0010] A liquid circulation module is connected to the preliminary treatment area via a pipe, and the preliminary treatment area exchanges heat with the exhaust heat recovery function module through the liquid circulation module;

[0011] A heat pump module is connected to the deep processing zone via a pipe, and the heat pump module may exchange heat with the liquid circulation module.

[0012] Preferably, the heat pump module includes a compressor, a four-way valve, a refrigerant electric ball valve, a refrigeration expansion valve, a heating expansion valve, a one-way valve, a first heat pump heat exchanger, a second heat pump heat exchanger, and a third heat pump heat exchanger. The first heat pump heat exchanger and the second heat pump heat exchanger are located in the deep processing zone, and air flows through the first heat pump heat exchanger and the second heat pump heat exchanger in sequence.

[0013] The liquid circulation module includes a heat recovery coil, a circulation pump, a pressure regulating device, a first bypass electric regulating valve, a second bypass electric regulating valve, and an exhaust heat recovery coil. The heat recovery coil is located within the preliminary treatment area, and the circulating medium flows within the liquid circulation module.

[0014] The third heat exchanger of the heat pump can exchange energy with the liquid circulation module;

[0015] The preliminary treatment area is also equipped with hot and cold water coils, which include a water supply pipe and a return pipe.

[0016] Preferably, the outlet of the circulating pump is connected to the inlet of the heat recovery coil and the first bypass electric regulating valve.

[0017] The outlet of the heat recovery coil is connected to the second bypass electric regulating valve and the inlet of the exhaust heat recovery coil, respectively. The outlet of the heat recovery coil is connected to the connecting pipe of the exhaust heat recovery coil and is in contact with the third heat exchanger of the heat pump. The outlet of the first bypass electric regulating valve is connected to the second bypass electric regulating valve and the connecting pipe between the heat recovery coil and the exhaust heat recovery coil. The outlet of the exhaust heat recovery coil is connected to the inlet of the circulating pump.

[0018] The compressor is connected to the second heat exchanger of the heat pump and the refrigerant electric ball valve. The outlet of the second heat exchanger of the heat pump is connected to the first check valve. The outlet of the first check valve and the outlet of the refrigerant electric ball valve are connected to port A of the four-way valve. Port B of the four-way valve is connected to the first heat exchanger of the heat pump. The first heat exchanger of the heat pump is connected to port D of the four-way valve. A refrigeration expansion valve, a heating expansion valve and a corresponding check valve are connected in series in the pipeline connecting the first heat exchanger of the heat pump and the four-way valve. Port C of the four-way valve is connected to the compressor.

[0019] The one-way valve includes a second one-way valve and a third one-way valve. By setting the second one-way valve and the third one-way valve, the pipeline connecting the first heat exchanger of the heat pump to the four-way valve only passes through the refrigeration expansion valve or the heating expansion valve.

[0020] Preferably, in cooling mode, the air is pre-cooled and dehumidified in the preliminary treatment zone, and then deeply dehumidified and reheated in the deep treatment zone.

[0021] In heating mode, air is preheated in the preliminary treatment zone, and then heated and reheated in the deep treatment zone.

[0022] In heat recovery mode, the liquid circulation module recovers heat from the exhaust air and uses the recovered heat for air treatment in the preliminary treatment area.

[0023] Preferably, in heating mode, the heat pump module includes:

[0024] The compressor compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant, which is then switched to the heating cycle via the four-way valve and the refrigerant electric ball valve, and flows sequentially through the second heat exchanger, the first heat exchanger, and the third heat exchanger of the heat pump.

[0025] The high-temperature and high-pressure gaseous refrigerant condenses and releases heat in the second heat exchanger and the first heat exchanger of the heat pump, transforming into a medium-temperature and high-pressure liquid refrigerant, which heats and reheats the air entering the deep treatment zone, raising the air temperature.

[0026] The refrigerant flowing through the first and second heat exchangers of the heat pump is throttled and depressurized through the heating expansion valve to form a low-temperature, low-pressure gas-liquid two-phase refrigerant. Then, the refrigerant exchanges energy with the liquid circulation module in the third heat exchanger of the heat pump, evaporates, and then returns to the compressor to complete the cycle.

[0027] Driven by a circulation pump, the liquid circulation module forms a circulation loop, recovers heat from the exhaust air, and releases the recovered heat to the preliminary treatment area through the heat recovery coil, thereby preheating the air.

[0028] Preferably, in heating mode, the liquid circulation module forms a circulation loop under the drive of the circulation pump, and forms at least two working processes by switching the opening and closing of the first bypass electric regulating valve and the second bypass electric regulating valve:

[0029] In the first working process, the first bypass electric regulating valve is closed and the second bypass electric regulating valve is closed. The circulating medium flows out of the exhaust heat recovery coil and enters the heat recovery coil. Heat is released in the heat recovery coil, which raises the temperature of the air flowing through the preliminary treatment zone. Then, it exchanges energy with the third heat exchanger of the heat pump and enters the exhaust heat recovery coil again. Heat is absorbed in the exhaust air in the exhaust heat recovery coil, which lowers the exhaust air temperature. Then it returns to the circulating pump.

[0030] In the second working process, the first bypass electric regulating valve is opened and the second bypass electric regulating valve is closed. The circulating medium flows out of the exhaust heat recovery coil and is divided into two paths. One path enters the heat recovery coil to release heat, thereby increasing the temperature of the air flowing through the preliminary treatment zone. The other path bypasses through the first bypass electric regulating valve. After the two paths merge, they exchange energy with the third heat exchanger of the heat pump and then enter the exhaust heat recovery coil to absorb heat from the exhaust air, thereby reducing the exhaust air temperature. After that, the medium returns to the circulating pump.

[0031] Preferably, in cooling mode, the heat pump module includes:

[0032] The compressor compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant is split into at least two paths, one of which enters the second heat exchanger of the heat pump. In the second heat exchanger of the heat pump, heat is released by condensation, which raises the temperature of the air flowing through the second heat exchanger of the heat pump.

[0033] The refrigerant flowing out of the second heat exchanger of the heat pump merges with another high-temperature and high-pressure gaseous refrigerant and enters the four-way valve, then enters the third heat exchanger of the heat pump. In the third heat exchanger of the heat pump, it exchanges heat with the circulating medium in the liquid circulation module, and the refrigerant is cooled and converted into liquid refrigerant.

[0034] The liquid refrigerant enters the refrigeration expansion valve through a one-way valve, where it is throttled and depressurized to form a low-temperature, low-pressure gas-liquid two-phase refrigerant. It then enters the first heat exchanger of the heat pump, where it evaporates and absorbs heat, thereby cooling and dehumidifying the air flowing through the first heat exchanger.

[0035] The evaporated refrigerant returns to the compressor via a four-way valve to complete the cycle;

[0036] The refrigerant flow rate in the second heat exchanger of the heat pump is regulated by a refrigerant electric ball valve to control the reheat temperature rise of the air.

[0037] Driven by a circulation pump, the liquid circulation module forms a circulation loop, transferring heat from the exhaust air to the heat recovery coil to pre-cool the air in the preliminary treatment area.

[0038] Preferably, in cooling mode, the liquid circulation module forms a circulation loop under the drive of the circulation pump, and forms at least two working processes by switching the opening and closing of the first bypass electric regulating valve and the second bypass electric regulating valve:

[0039] In the first working process, the first bypass electric regulating valve is closed and the second bypass electric regulating valve is closed. The circulating medium flows out of the exhaust heat recovery coil and enters the heat recovery coil. It exchanges heat with the air in the heat recovery coil, which lowers the temperature of the air flowing through the preliminary treatment zone. Then it enters the third heat exchanger of the heat pump for energy exchange, and then enters the exhaust heat recovery coil. Heat is released in the exhaust heat recovery coil, which raises the exhaust temperature. Then it returns to the circulating pump.

[0040] In the second working process, the first bypass electric regulating valve is opened and the second bypass electric regulating valve is closed. The circulating medium flows out of the exhaust heat recovery coil and is divided into two paths. One path enters the heat recovery coil to exchange heat with the air, thereby reducing the temperature of the air flowing through the preliminary treatment zone. The other path bypasses through the first bypass electric regulating valve. After the two paths merge, they enter the third heat exchanger of the heat pump for heat exchange and temperature increase, and then enter the exhaust heat recovery coil to release heat, thereby increasing the exhaust temperature. After that, it returns to the circulating pump.

[0041] Preferably, in heat recovery mode, the heat pump module stops working, and the liquid circulation module forms a circulation loop under the drive of the circulation pump. The first bypass electric regulating valve is closed and the second bypass electric regulating valve is opened, so that the circulating medium circulates between the heat recovery coil and the exhaust heat recovery coil and transfers heat.

[0042] When the air temperature on one side of the exhaust heat recovery coil is lower than the air temperature in the preliminary treatment zone, the circulating medium first absorbs heat from the air in the heat recovery coil, thereby reducing the air temperature flowing through the preliminary treatment zone. Then, it enters the exhaust heat recovery coil to release heat, thereby increasing the exhaust temperature.

[0043] When the air temperature on one side of the exhaust heat recovery coil is higher than the air temperature in the preliminary treatment zone, the circulating medium first releases heat in the heat recovery coil, causing the air temperature flowing through the preliminary treatment zone to rise, and then enters the exhaust heat recovery coil to absorb the heat in the exhaust air, thus lowering the exhaust air temperature.

[0044] Preferably, in cooling mode, the water supply pipe provides high-temperature cold water to the hot and cold water coils to pre-cool and dehumidify the air;

[0045] In heating mode, the water supply pipe provides hot water to the hot and cold water coils to preheat the air.

[0046] Preferably, in cooling mode, the water supply pipe provides the hot and cold water coils with high-temperature cold water above 10°C;

[0047] In heating mode, the water supply pipe provides hot water at a temperature of 30°C or higher to the hot and cold water coils.

[0048] Preferably, the refrigerant electric ball valve is used to regulate the refrigerant flow rate entering the second heat exchanger of the heat pump, thereby regulating the reheat of the air in the deep treatment zone.

[0049] Preferably, the first bypass electric regulating valve is used to regulate the flow rate of the circulating medium entering the heat recovery coil, so as to regulate the air pretreatment capacity in the preliminary treatment zone.

[0050] Preferably, the second bypass electric regulating valve is opened in heat recovery mode, and the circulating medium forms a bypass circulation path between the heat recovery coil and the exhaust heat recovery coil.

[0051] The beneficial effects of this invention are:

[0052] (1) By setting up an air treatment module, a graded treatment structure of a preliminary treatment zone and a deep treatment zone is formed, realizing the pre-treatment and deep treatment of air, so that the air can be pre-cooled or pre-heated before entering the deep dehumidification, thereby reducing the subsequent treatment load and solving the problems of severe temperature and humidity coupling treatment and low module energy efficiency.

[0053] (2) By means of the present invention, a deep processing zone is set up consisting of a first heat exchanger and a second heat exchanger of a heat pump, and the air is cooled, dehumidified and reheated by the phase change process of the refrigerant in different heat exchangers. This allows the air to be reheated without additional heating devices after dehumidification, which improves the overall energy efficiency of the module and solves the problem of high energy consumption in the dehumidification process.

[0054] (3) By setting up a liquid circulation module and forming a closed circulation loop with the heat recovery coil and the exhaust heat recovery coil through the present invention, heat transfer between the exhaust side and the fresh air side is realized, so that the sensible heat or cold energy in the exhaust can be recovered and used for air pretreatment, significantly reducing the fresh air treatment load, thereby solving the problem of direct exhaust energy discharge and low energy utilization.

[0055] (4) By setting up a third heat exchanger for the heat pump and exchanging energy with the liquid circulation module, the heat pump module and the liquid circulation module can exchange energy, so that the cold or heat generated by the heat pump can be transferred or released through the liquid circulation module, thereby improving the module's energy allocation capability and solving the problem of the heat pump module and the heat recovery module being difficult to coordinate.

[0056] (5) Through this invention, in the cooling mode, the air is deeply dehumidified by the first heat exchanger of the heat pump and the air is reheated by the second heat exchanger of the heat pump. At the same time, the heat in the module is transferred to the exhaust side by the liquid circulation module, so that the module can achieve efficient dehumidification while avoiding the accumulation of condensation heat, thereby improving the dehumidification capacity and operational stability and overcoming the problem of insufficient dehumidification capacity in high temperature and high humidity environments. Attached Figure Description

[0057] Figure 1 This is a schematic diagram of the structure of the present invention.

[0058] Figure 2 This is a schematic diagram of the refrigerant flow in the heating mode of the present invention.

[0059] Figure 3 This is a schematic diagram of refrigerant flow in the refrigeration mode of the present invention.

[0060] Figure 4 This is a diagram of the first working process mode of the liquid circulation module of the present invention.

[0061] Figure 5 This is a diagram showing the second working mode of the liquid circulation module of the present invention.

[0062] Figure 6 This is a diagram of the liquid circulation module of the present invention in a heat recovery mode.

[0063] In the diagram: 1-Air handling module, 2-Heat pump module, 3-Liquid circulation module, 4-Exhaust heat recovery module, 101-Heat recovery coil, 102-Hot and cold water coil, 103-Heat pump first heat exchanger, 104-Heat pump second heat exchanger, 201-Compressor, 202-Refrigerant electric ball valve, 203-First check valve, 204-Four-way valve, 205-Refrigeration expansion valve, 206-Heating expansion valve, 207-Second check valve, 208-Third check valve, 209-Heat pump third heat exchanger, 301-Circulation pump, 302-Pressure regulating device, 303-First bypass electric regulating valve, 304-Second bypass electric regulating valve, 401-Exhaust heat recovery coil. Detailed Implementation

[0064] To facilitate a clear understanding of the technical means, creative features, objectives, and effects of this invention, the invention will be further described below in conjunction with specific embodiments.

[0065] Example 1

[0066] like Figures 1-6 As shown, a composite heat recovery type dual-cooling-source air conditioning unit,

[0067] include

[0068] Air handling module 1 includes a preliminary treatment zone and a deep treatment zone. Air entering air handling module 1 first passes through the preliminary treatment zone and then through the deep treatment zone. The preliminary treatment zone pre-treats the air by heating or cooling, and the deep treatment zone condenses and heats or cools the pre-treated air.

[0069] Exhaust heat recovery module 4 is used for heat exchange of exhaust air. The exhaust heat recovery module is connected to the liquid circulation module through a pipe.

[0070] Liquid circulation module 3 is connected to the preliminary treatment area through a pipeline. The preliminary treatment area and the exhaust heat recovery function module exchange heat through the liquid circulation module.

[0071] Heat pump module 2 is connected to the deep processing zone via pipes. Heat pump module may exchange heat with liquid circulation module.

[0072] The system includes an air handling module 1, an exhaust heat recovery module 4, a liquid circulation module 3, and a heat pump module 2. During operation, the liquid circulation module 3 and the heat pump module 2 may or may not exchange energy depending on the mode.

[0073] The heat pump module 2 includes a compressor 201, a four-way valve 204, a refrigerant electric ball valve 202, a refrigeration expansion valve 205, a heating expansion valve 206, a one-way valve, a first heat pump heat exchanger 103, a second heat pump heat exchanger 104, and a third heat pump heat exchanger 209. The first heat pump heat exchanger 103 and the second heat pump heat exchanger 104 are located in the deep processing zone, and air flows through the first heat pump heat exchanger 103 and the second heat pump heat exchanger 104 in sequence.

[0074] The liquid circulation module 3 includes a heat recovery coil 101, a circulation pump 301, a pressure regulating device 302, a first bypass electric regulating valve 303, a second bypass electric regulating valve 304, and an exhaust heat recovery coil 401. The heat recovery coil 101 is located in the preliminary treatment area, and the circulating medium flows in the liquid circulation module 3.

[0075] The third heat exchanger 209 of the heat pump can exchange energy with the liquid circulation module 3.

[0076] The outlet of heat recovery coil 101 is connected to the second bypass electric regulating valve 304 and the inlet of exhaust heat recovery coil 401 respectively. The connecting pipe between the outlet of heat recovery coil 101 and exhaust heat recovery coil 401 is in contact with the third heat exchanger 209 of the heat pump. The outlet of the first bypass electric regulating valve 303 is connected to the second bypass electric regulating valve 304 and the connecting pipe between heat recovery coil 101 and exhaust heat recovery coil 401. The outlet of exhaust heat recovery coil 401 is connected to the inlet of circulating pump 301.

[0077] Compressor 201 is connected to heat pump second heat exchanger 104 and refrigerant electric ball valve 202. The outlet of heat pump second heat exchanger 104 is connected to first check valve 203. The outlet of first check valve 203 and the outlet of refrigerant electric ball valve 202 are connected to port A of four-way valve 204. Port B of four-way valve 204 is connected to heat pump first heat exchanger 103. Heat pump first heat exchanger 103 is connected to port D of four-way valve 204. Refrigeration expansion valve 205, heating expansion valve 206 and corresponding check valves are connected in series in the pipeline connecting heat pump first heat exchanger 103 and four-way valve 204. Port C of four-way valve 204 is connected to compressor 201.

[0078] The one-way valve includes a second one-way valve 207 and a third one-way valve 208. By setting the second one-way valve 207 and the third one-way valve 208, the pipeline connecting the first heat exchanger 103 of the heat pump to the four-way valve 204 is only through the refrigeration expansion valve 205 or the heating expansion valve 206.

[0079] Heat pump module 2 can switch between cooling mode, heating mode and heat recovery mode;

[0080] The liquid circulation module can recover heat from the exhaust air;

[0081] In cooling mode, the air undergoes pre-cooling and dehumidification in the preliminary treatment zone, and deep dehumidification and reheating in the deep treatment zone.

[0082] In heating mode, the air is preheated in the preliminary treatment zone and then heated and reheated in the deep treatment zone.

[0083] In heat recovery mode, the liquid circulation module 3 recovers heat from the exhaust air and uses the recovered heat for air treatment in the preliminary treatment zone. The air can be heated or cooled as it passes through the preliminary treatment zone.

[0084] The heat pump module 2 includes a compressor 201, a four-way valve 204, a refrigerant electric ball valve 202, an expansion valve, a one-way valve, a first heat pump heat exchanger 103, a second heat pump heat exchanger 104, and a third heat pump heat exchanger 209.

[0085] The first heat exchanger 103 and the second heat exchanger 104 of the heat pump are arranged in the deep processing zone, and the air flows through the first heat exchanger 103 and the second heat exchanger 104 of the heat pump in sequence in the deep processing zone.

[0086] The liquid circulation module 3 includes a heat recovery coil 101, a circulation pump 301, a pressure regulating device 302, a first bypass electric regulating valve 303, a second bypass electric regulating valve 304, and an exhaust heat recovery coil 401.

[0087] The heat recovery coil 101 is located in the preliminary treatment zone, and the circulating medium flows in the liquid circulation module 3.

[0088] The third heat exchanger 209 of the heat pump may or may not exchange energy with the liquid circulation module 3.

[0089] A hot and cold water coil 102 is also installed in the preliminary treatment area. The hot and cold water coil 102 includes a water supply pipe and a water return pipe.

[0090] The unit is also equipped with a fan to drive air to flow in the air handling module 1 and to drive exhaust air to flow in the exhaust heat recovery module 4.

[0091] In this embodiment, the air handling module 1 is equipped with a heat recovery coil 101, a hot and cold water coil 102, a first heat pump heat exchanger 103, and a second heat pump heat exchanger 104. The air handling module 1 is divided into a preliminary treatment zone and a deep treatment zone. The heat recovery coil 101 and the hot and cold water coil 102 are located in the preliminary treatment zone, while the first heat pump heat exchanger 103 and the second heat pump heat exchanger 104 are located in the deep treatment zone.

[0092] After entering the air handling module 1 under the drive of the fan, the air first enters the preliminary treatment zone, flows through the heat recovery coil and the hot and cold water coil in sequence, and then enters the deep treatment zone, flows through the first heat exchanger 103 and the second heat exchanger 104 of the heat pump in sequence, and is finally sent out through the air outlet.

[0093] The heat recovery coil 101, hot and cold water coil 102, first heat pump heat exchanger 103, and second heat pump heat exchanger 104 are finned heat exchangers or microchannel heat exchangers, consisting of multiple rows of parallel copper tubes and aluminum fins surrounding the copper tubes. The overall structure is a rectangular plate, vertically arranged within the airflow channel. A continuous flow channel is formed inside the copper tubes for the circulation of the medium, while the aluminum fins increase the heat exchange area and improve the heat exchange efficiency between the air and the circulating medium. The hot and cold water coil has a similar structure to the heat recovery coil, also employing a finned design. It contains supply and return water pipes for connecting to an external hot or cold water source to achieve auxiliary air conditioning. Both the first and second heat pump heat exchangers are finned heat exchangers or microchannel heat exchangers, with internal refrigerant flow channels, achieving air temperature and humidity regulation through heat exchange with the air.

[0094] Liquid circulation module 3 is a closed-loop circulation module, including a circulation pump 301, a pressure regulating device 302, a first bypass electric regulating valve 303, and a second bypass electric regulating valve 304. The circulation pump 301 is a centrifugal pump used to drive the circulation medium within the module. The pressure regulating device 302 maintains stable pressure within the module, preventing pressure fluctuations caused by temperature changes from affecting module operation. The liquid circulation pipeline uses corrosion-resistant metal or composite material pipes, connecting the heat recovery coil 101 and the exhaust heat recovery coil 401 to form a closed-loop circulation circuit. The first bypass electric regulating valve 303 regulates the amount of circulation medium entering the heat recovery coil. The second bypass electric regulating valve 304 can form a bypass circuit for the circulation medium.

[0095] A hot and cold water coil 102 is also installed in the preliminary treatment area. The hot and cold water coil 102 is equipped with a return water pipe and a supply water pipe. The supply water pipe can provide external water sources of different temperatures according to different operating modes. The external water source exchanges heat with the air flowing in the preliminary treatment area through the hot and cold water coil 102 and is discharged through the return water pipe.

[0096] Heat pump module 2 is also a closed-loop module, including compressor 201, four-way valve 204, and refrigerant electric ball valve 202, which switches between cooling and heating modes. The refrigerant electric ball valve 202 is located in the branch line after compressor discharge and is used to regulate the refrigerant flow into the second heat exchanger 104 of the heat pump, thereby controlling the reheat capacity. Cooling expansion valve 205 and heating expansion valve 206 are used to throttle and reduce the pressure of the refrigerant in different operating modes. First one-way valve 203, second one-way valve 204, and third one-way valve 208 are used to control the refrigerant flow direction and prevent backflow. The third heat exchanger 209 is a refrigerant liquid heat exchanger, which can adopt a plate, shell-and-tube, or tubular structure, and is used to achieve heat exchange between heat pump module 2 and liquid circulation module 3.

[0097] In this embodiment, the heat pump module 2 can switch between cooling mode, heating mode, and heat recovery mode. In cooling mode, the air sequentially undergoes pre-cooling and dehumidification in the preliminary treatment zone, and then undergoes deep dehumidification and reheating in the deep treatment zone.

[0098] In heating mode, the air is preheated in the preliminary treatment zone, and then heated and reheated in the deep treatment zone.

[0099] In heat recovery mode, the liquid circulation module recovers heat from the exhaust air and uses the recovered heat for air treatment in the preliminary treatment area.

[0100] In heating mode

[0101] Air flows within air handling module 1, first passing through the preliminary treatment zone, where:

[0102] Air flows through heat recovery coil 101, where the circulating medium releases heat, raising the air temperature and achieving preheating. The air then flows through hot and cold water coil 102.

[0103] The water supply pipe in the hot and cold water coil 102 can provide hot water at a temperature of over 30 degrees Celsius, further increasing the temperature of the air flowing through the hot and cold water coil 102.

[0104] Air enters the deep treatment zone after flowing through the hot and cold water coil 102. Within the deep treatment zone:

[0105] Air flows through the first heat exchanger 103 of the heat pump, where it exchanges heat with the high-temperature, high-pressure refrigerant, further increasing its temperature. The air then enters the second heat exchanger 104, where it continues to receive heat released by the refrigerant, achieving reheating.

[0106] The refrigerant circulation process of heat pump module 2 in heating mode is as follows:

[0107] The compressor 201 compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. A portion of the high-temperature, high-pressure gaseous refrigerant flows into the second heat exchanger 104 of the heat pump to exchange heat with the air, while the other portion flows into the refrigerant electric ball valve 202.

[0108] The refrigerant flowing into the second heat exchanger 104 condenses and releases heat inside, then flows out and mixes with the refrigerant flowing into the refrigerant electric ball valve 202 before entering inlet a of the four-way valve 204 and flowing out through port b. The refrigerant flowing out through port b of the four-way valve 204 enters the first heat exchanger 103 of the heat pump to exchange heat with the air.

[0109] Subsequently, the refrigerant flows out from the first heat exchanger 103 of the heat pump. After passing through the second one-way valve 207, the refrigerant enters the heating expansion valve 206 for throttling and then enters the inlet of the third heat exchanger 209 of the heat pump. It exchanges heat with the liquid circulation module 3 flowing through the third heat exchanger 209 of the heat pump. The medium flowing through the liquid circulation module 3 is cooled and the refrigerant evaporates.

[0110] The refrigerant flowing out of the third heat exchanger 209 of the heat pump enters the d port of the four-way reversing valve 204, and returns to the suction port of the compressor 201 through the c port of the four-way reversing valve 204.

[0111] During this process, the high-temperature and high-pressure gaseous refrigerant condenses and releases heat in the first heat exchanger 103 and the second heat exchanger 104 of the heat pump, transforming into a medium-temperature and high-pressure liquid refrigerant, which heats and reheats the air entering the deep treatment zone, thereby raising the air temperature.

[0112] The refrigerant flowing through the first heat exchanger 103 and the second heat exchanger 104 of the heat pump is throttled and depressurized by the heating expansion valve 206 to form a low-temperature, low-pressure gas-liquid two-phase refrigerant. Then, the refrigerant exchanges energy with the liquid circulation module 3 in the third heat exchanger 209 of the heat pump, the refrigerant evaporates, and then returns to the compressor to complete the cycle.

[0113] The liquid circulation module 3 forms a circulation loop under the drive of the circulation pump 301, recovers heat from the exhaust air and releases the recovered heat to the preliminary treatment zone through the heat recovery coil 101, so that the air flowing through the preliminary treatment zone is preheated.

[0114] In this embodiment, in heating mode, the refrigerant releases heat to the air in the first heat exchanger 103 and the second heat exchanger 104 of the heat pump, and absorbs heat from the liquid circulation module 3 in the third heat exchanger 209 of the heat pump.

[0115] In heating mode, the liquid circulation module 3 forms two working processes by switching the opening and closing of the first bypass electric regulating valve 303 and the second bypass electric regulating valve 304:

[0116] In the first operating process, the first bypass electric regulating valve 303 is closed, and the second bypass electric regulating valve 304 is closed.

[0117] Driven by the circulating pump 301, the circulating medium flows out of the exhaust heat recovery coil 401 and enters the heat recovery coil 101, where it releases heat, causing the temperature of the air flowing through the preliminary treatment zone to rise while the temperature of the circulating medium decreases.

[0118] The circulating medium then enters the third heat exchanger 209 of the heat pump for energy exchange, and then enters the exhaust heat recovery coil 401.

[0119] After the circulating medium enters the third heat exchanger 209 of the heat pump, it exchanges heat with the refrigerant inside the third heat exchanger 209. The circulating medium releases heat to the refrigerant and its temperature decreases. The refrigerant absorbs the heat from the circulating medium and its temperature increases. Then the circulating medium enters the exhaust heat recovery coil 401 to continue exchanging heat with the exhaust air.

[0120] The heat in the exhaust air is absorbed in the exhaust heat recovery coil 401, which lowers the exhaust air temperature and raises the temperature of the circulating medium, which then returns to the circulating pump 301.

[0121] Driven by the circulating pump 301, the circulating medium flows sequentially through the heat recovery coil 101, the third heat exchanger 209, and the exhaust heat recovery coil 401. Heat is released in the heat recovery coil 101, causing the temperature of the air flowing through the preliminary treatment zone to rise, while the temperature of the circulating medium decreases. Subsequently, the circulating medium enters the third heat exchanger 209 for heat exchange and cooling, and then enters the exhaust heat recovery coil 401, where it absorbs heat from the exhaust air, causing the exhaust air temperature to decrease, while the temperature of the circulating medium increases. After that, it returns to the circulating pump 301.

[0122] In the second operating process, the first bypass electric regulating valve 303 is opened and the second bypass electric regulating valve 304 is closed.

[0123] Driven by the circulating pump 301, the circulating medium flows out from the exhaust heat recovery coil 401. A portion of the circulating medium enters the heat recovery coil 101 and releases heat in the heat recovery coil 101, causing the temperature of the air flowing through the preliminary treatment zone to rise, while the temperature of the circulating medium decreases.

[0124] The remaining circulating medium flows into the first bypass electric regulating valve 303;

[0125] The circulating medium flowing out of the heat recovery coil 101 mixes with the circulating medium flowing into the first bypass electric regulating valve 303 and then enters the third heat exchanger 209 of the heat pump for heat exchange, before entering the exhaust heat recovery coil 401.

[0126] After the circulating medium enters the third heat exchanger 209 of the heat pump, it exchanges heat with the refrigerant inside the third heat exchanger 209. The circulating medium releases heat to the refrigerant and its temperature decreases. The refrigerant absorbs the heat from the circulating medium and its temperature increases. Then the circulating medium enters the exhaust heat recovery coil 401 to continue exchanging heat with the exhaust air.

[0127] The heat in the exhaust air is absorbed in the exhaust heat recovery coil 401, which lowers the exhaust air temperature and raises the temperature of the circulating medium, which then returns to the circulating pump 301.

[0128] Different flow distribution patterns can be formed by adjusting the bypass valve, thereby regulating the amount of heat recovery.

[0129] The refrigerant circulation process of heat pump module 2 in cooling mode is as follows:

[0130] The compressor 201 compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. A portion of the high-temperature, high-pressure gaseous refrigerant flows into the second heat exchanger 104 of the heat pump to exchange heat with the air, while the other portion flows into the refrigerant electric ball valve 202.

[0131] The refrigerant entering the second heat exchanger 104 of the heat pump exchanges heat with the air and condenses and releases heat. The refrigerant gradually changes from a high-temperature and high-pressure gaseous refrigerant to a high-pressure liquid refrigerant or a high-pressure gas-liquid two-phase refrigerant, and uses the released heat to reheat the air flowing through the second heat exchanger 104 of the heat pump.

[0132] The refrigerant flowing out of the second heat exchanger 104 of the heat pump mixes with the refrigerant flowing into the electric ball valve 202 and enters the inlet a of the four-way valve 204. After flowing out through the d port of the four-way valve 204, it enters the inlet of the third heat exchanger 209 of the heat pump and exchanges heat with the circulating medium in the liquid circulation module 3 flowing through the third heat exchanger 209 of the heat pump. The refrigerant is further cooled and converted into high-pressure liquid refrigerant in the third heat exchanger 209 of the heat pump.

[0133] The liquid refrigerant flowing out of the third heat exchanger 209 of the heat pump enters the refrigeration expansion valve 205 through the third one-way valve 208, where it is throttled and depressurized, transforming into a low-temperature, low-pressure gas-liquid two-phase refrigerant. This refrigerant then enters the first heat exchanger 103 of the heat pump, where it exchanges heat with the air and absorbs heat through evaporation, thus cooling and dehumidifying the air flowing through it. The evaporated refrigerant flows out through port b of the four-way valve 204 and then returns to the suction port of the compressor 201 through port c of the four-way valve 204, completing the refrigerant cycle.

[0134] In this embodiment, in cooling mode, the refrigerant releases heat to the air in the second heat exchanger 104 of the heat pump and absorbs heat from the air in the first heat exchanger 103 of the heat pump. In this embodiment, in cooling mode, the refrigerant releases heat to the air in the second heat exchanger 104 of the heat pump, releases heat to the liquid circulation module in the third heat exchanger 209 of the heat pump, and absorbs heat from the air in the first heat exchanger 103 of the heat pump.

[0135] In cooling mode, the liquid circulation module 3 forms two working processes by switching the opening and closing of the first bypass electric regulating valve 303 and the second bypass electric regulating valve 304:

[0136] In the first operating process, the first bypass electric regulating valve 303 is closed, and the second bypass electric regulating valve 304 is closed.

[0137] Driven by the circulating pump 301, the circulating medium flows out of the exhaust heat recovery coil 401 and enters the heat recovery coil 101. In the heat recovery coil 101, it absorbs heat from the air, which lowers the temperature of the air flowing through the preliminary treatment zone and raises the temperature of the circulating medium.

[0138] Subsequently, the circulating medium enters the third heat exchanger 209 of the heat pump, where it absorbs heat from the refrigerant, causing the temperature of the circulating medium to rise further and the temperature of the refrigerant flowing inside the third heat exchanger 209 to decrease.

[0139] The circulating medium then enters the exhaust heat recovery coil 401, where it releases heat, causing the exhaust temperature to rise while the temperature of the circulating medium decreases. The medium then returns to the circulating pump 301.

[0140] Driven by the circulating pump 301, the circulating medium flows sequentially through the heat recovery coil 101, the third heat exchanger 209, and the exhaust heat recovery coil 401. In the heat recovery coil 101, it absorbs heat, lowering the temperature of the air flowing through the preliminary treatment zone while simultaneously raising the temperature of the circulating medium. The circulating medium then enters the third heat exchanger 209 for further heat exchange and temperature increase. Energy exchange occurs in the third heat exchanger 209, causing the circulating medium temperature to rise. The temperature of the refrigerant flowing within the third heat exchanger 209 decreases. The circulating medium then enters the exhaust heat recovery coil 401, where it releases heat, raising the exhaust air temperature while simultaneously lowering the circulating medium temperature, before returning to the circulating pump 301.

[0141] In the second operating process, the first bypass electric regulating valve 303 is opened and the second bypass electric regulating valve 304 is closed.

[0142] Driven by the circulating pump 301, the circulating medium flows out from the exhaust heat recovery coil 401. A portion of the circulating medium enters the heat recovery coil 101, where heat is absorbed, causing the air temperature flowing through the preliminary treatment zone to decrease, while the temperature of the circulating medium increases.

[0143] The remaining circulating medium flows into the first bypass electric regulating valve 303;

[0144] The circulating medium flowing out of the heat recovery coil 101 mixes with the circulating medium flowing into the first bypass electric regulating valve 303 and then enters the third heat exchanger 209 of the heat pump for energy exchange, before entering the exhaust heat recovery coil 401.

[0145] After the circulating medium enters the third heat exchanger 209 of the heat pump, it exchanges energy with the refrigerant inside the heat pump third heat exchanger 209, causing the temperature of the circulating medium to rise. The temperature of the refrigerant flowing inside the third heat exchanger 209 decreases. The circulating medium then enters the exhaust heat recovery coil 401, where it releases heat, causing the exhaust temperature to rise while the temperature of the circulating medium decreases, and then returns to the circulating pump 301.

[0146] In heat recovery mode, heat pump module 2 stops working, and liquid circulation module 3 forms a circulation loop under the drive of circulation pump 301. The first bypass electric regulating valve 303 is closed and the second bypass electric regulating valve 304 is opened, so that the circulation medium circulates between heat recovery coil 101 and exhaust heat recovery coil 401 and transfers heat.

[0147] When the temperature of the air flowing through the exhaust heat recovery coil is lower than that of the air flowing through the heat recovery coil, the medium-temperature liquid flowing out of the exhaust heat recovery coil 401 is drawn in by the circulation pump 301, pressurized, and then enters the heat recovery coil 101. The liquid absorbs heat in the heat recovery coil 101, cooling the air flowing through it. At the same time, the liquid absorbs heat from the air and becomes a high-temperature liquid. The high-temperature liquid enters the exhaust heat recovery coil 401, releases heat in the exhaust heat recovery coil 401, warming the air flowing through it. Meanwhile, the liquid becomes a medium-temperature liquid and returns to the suction port of the circulation pump 301.

[0148] When the air temperature on one side of the exhaust heat recovery coil 401 is higher than the air temperature in the preliminary treatment area, the medium-temperature liquid flowing out of the exhaust heat recovery coil 401 is drawn in by the circulation pump 301, pressurized, and then enters the heat recovery coil 101. The liquid releases heat in the heat recovery coil 101, raising the temperature of the air flowing through the heat recovery coil 101. At the same time, the liquid absorbs the coldness of the air and becomes a low-temperature liquid. The low-temperature liquid enters the exhaust heat recovery coil 401, absorbs heat in the exhaust heat recovery coil 401, cools the air flowing through the exhaust heat recovery coil 401, and at the same time, the liquid becomes a medium-temperature liquid and returns to the suction port of the circulation pump 301.

[0149] In this embodiment,

[0150] In cooling mode, the water supply pipe provides high-temperature cold water to the hot and cold water coil 102 to pre-cool and dehumidify the air; preferably, in cooling mode, the water supply pipe provides high-temperature cold water above 10°C to the hot and cold water coil 102.

[0151] In heating mode, the water supply pipe provides hot water to the hot and cold water coil 102 to preheat the air; preferably, in heating mode, the water supply pipe provides hot water above 30°C to the hot and cold water coil 102.

[0152] In heat recovery mode, the water supply pipe provides hot water above 30°C to the hot and cold water coil 102, or the water supply pipe provides high-temperature cold water above 10°C to the hot and cold water coil 102. The specific temperature and humidity conditions of the incoming air and the target temperature and humidity conditions of the supplied air are determined according to the specific conditions of the incoming air and the target temperature and humidity conditions of the supplied air.

[0153] As another implementation method, in the heat recovery mode, the hot and cold water coil 102 stops working, and the air flowing through the preliminary treatment zone exchanges heat with the exhaust air through the liquid circulation module 3.

[0154] In this embodiment,

[0155] In cooling mode and heat recovery mode, the water supply pipe provides high-temperature cold water above 10°C to the hot and cold water coil 102. In operation mode, it can dehumidify the air passing through the air handling module 1.

[0156] In the cooling mode, the heat recovery coil 101 and the hot and cold water coil 102 pre-treat the air. Then, the first heat exchanger 103 of the heat pump acts as an evaporator to deeply dehumidify the air, and the heat pump module heat exchanger 104 acts as a condensation heat recovery device to reheat the dehumidified air.

[0157] In this embodiment, the refrigerant electric ball valve 202 is used to regulate the refrigerant flow rate entering the second heat exchanger 104 of the heat pump, thereby regulating the reheat of the air in the deep treatment zone.

[0158] The first bypass electric regulating valve 303 is used to regulate the flow rate of the circulating medium into the heat recovery coil 101, so as to regulate the air pretreatment capacity in the preliminary treatment zone.

[0159] The second bypass electric regulating valve 304 is opened in heat recovery mode, and the circulating medium forms a bypass circulation path between the heat recovery coil 101 and the exhaust heat recovery coil 401.

[0160] The airflow through the air handling module 1 and the exhaust heat recovery module 4 is provided by a fan. The liquid circulation module can be integrated into the air handling module 1, the exhaust heat recovery module 4, or set up independently. The air processed by the air handling module 1 is outdoor fresh air, indoor return air, or a mixture of fresh and return air.

[0161] In this embodiment, the combination of the exhaust heat recovery module and the air handling module 1 can be configured as a one-to-one, one-to-many, many-to-one, or many-to-many heat recovery mode according to actual engineering needs. Specifically, each of the multiple exhaust heat recovery modules can be equipped with an exhaust heat recovery coil 401. The multiple exhaust heat recovery coils 401 can be connected in parallel to the same liquid circulation module 3 through liquid circulation pipes and form a circulation loop with the heat recovery coil 101 in one air handling module 1; or they can form circulation loops with the heat recovery coils 101 in multiple air handling modules 1 respectively.

[0162] As another embodiment, the exhaust heat recovery coil 401 in one exhaust heat recovery module 4 can also form a circulation loop with the heat recovery coil 101 in one air handling module 1 through the liquid circulation module 3, and can further form a circulation loop with the heat recovery coil 101 in multiple air handling modules 1.

[0163] With the above arrangement, the circulating medium in the liquid circulation module can be distributed and transferred between multiple exhaust heat recovery coils 401 and multiple heat recovery coils 101, thereby realizing unified heat recovery and flexible matching between multiple exhaust air sources and multiple air handling terminals.

[0164] In terms of specific structure, multiple exhaust heat recovery functional modules 44 can be independently configured with exhaust ducts, each exhaust duct being equipped with an exhaust heat recovery coil 401. The inlets and outlets of the multiple exhaust heat recovery coils 401 are connected to the liquid circulation module through main lines and branch lines. Multiple air handling modules 1 can be independently configured with air ducts, each air duct being equipped with a heat recovery coil 101. The multiple heat recovery coils 101 are also connected to the liquid circulation module through main lines and branch lines. The liquid circulation module can achieve flow distribution between different branches through branch lines, manifold lines, and the first bypass electric regulating valve 303 and the second bypass electric regulating valve 304, so that the circulating medium can circulate between the multiple exhaust heat recovery coils 401 and the multiple heat recovery coils 101 according to different operating conditions.

[0165] With this setup, not only can a single exhaust heat recovery module provide conventional heat recovery for a single air handling module 1, but multiple exhaust heat recovery modules can also provide heat recovery for one or more air handling modules 1 together, or a single exhaust heat recovery module can serve multiple air handling modules 1 in a centralized heat recovery manner.

[0166] Through many-to-many, many-to-one, or one-to-many structural arrangements, the heat in the exhaust air can be centrally recovered, decentralizedly recovered, or combined recovered according to the load requirements of different air handling units. This makes the module more flexible and adaptable in engineering applications, and it can be applied to application scenarios such as multi-unit linkage, centralized air conditioning, zoned air supply, and multi-exhaust air source recovery, thereby further improving the overall energy utilization efficiency and reducing operating energy consumption.

[0167] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of the invention; all such changes and modifications fall within the scope of protection claimed by the present invention.

[0168] The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A composite heat recovery type dual-cooling-source air conditioning unit, characterized in that: include An air handling module includes a preliminary treatment zone and a deep treatment zone. Air entering the air handling module first passes through the preliminary treatment zone and then through the deep treatment zone. The preliminary treatment zone pre-treats the air by heating or cooling, and the deep treatment zone condenses and heats or cools the pre-treated air. An exhaust heat recovery module is used for heat exchange in exhaust air, and the exhaust heat recovery module is connected to a liquid circulation module through a pipe. A liquid circulation module is connected to the preliminary treatment area via a pipe, and the preliminary treatment area exchanges heat with the exhaust heat recovery function module through the liquid circulation module; A heat pump module is connected to the deep processing zone via a pipe, and the heat pump module may exchange heat with the liquid circulation module.

2. The composite heat recovery type dual-source air conditioning unit according to claim 1, characterized in that: The heat pump module includes a compressor, a four-way valve, a refrigerant electric ball valve, a refrigeration expansion valve, a heating expansion valve, a one-way valve, a first heat pump heat exchanger, a second heat pump heat exchanger, and a third heat pump heat exchanger. The first heat pump heat exchanger and the second heat pump heat exchanger are located in the deep processing zone, and air flows through the first heat pump heat exchanger and the second heat pump heat exchanger in sequence. The liquid circulation module includes a heat recovery coil, a circulation pump, a pressure regulating device, a first bypass electric regulating valve, a second bypass electric regulating valve, and an exhaust heat recovery coil. The heat recovery coil is located within the preliminary treatment area, and the circulating medium flows within the liquid circulation module. The third heat exchanger of the heat pump can exchange energy with the liquid circulation module; The preliminary treatment area is also equipped with hot and cold water coils, which include a water supply pipe and a return pipe.

3. A composite heat recovery type dual-source air conditioning unit according to claim 2, characterized in that: The outlet of the circulating pump is connected to the inlet of the heat recovery coil and the first bypass electric regulating valve. The outlet of the heat recovery coil is connected to the second bypass electric regulating valve and the inlet of the exhaust heat recovery coil, respectively. The outlet of the heat recovery coil is connected to the connecting pipe of the exhaust heat recovery coil and is in contact with the third heat exchanger of the heat pump. The outlet of the first bypass electric regulating valve is connected to the second bypass electric regulating valve and the connecting pipe between the heat recovery coil and the exhaust heat recovery coil. The outlet of the exhaust heat recovery coil is connected to the inlet of the circulating pump; The compressor is connected to the second heat exchanger of the heat pump and the refrigerant electric ball valve. The outlet of the second heat exchanger of the heat pump is connected to the first check valve. The outlet of the first check valve and the outlet of the refrigerant electric ball valve are connected to port A of the four-way valve. Port B of the four-way valve is connected to the first heat exchanger of the heat pump. The first heat exchanger of the heat pump is connected to port D of the four-way valve. A refrigeration expansion valve, a heating expansion valve and a corresponding check valve are connected in series in the pipeline connecting the first heat exchanger of the heat pump and the four-way valve. Port C of the four-way valve is connected to the compressor. The one-way valve includes a second one-way valve and a third one-way valve. By setting the second one-way valve and the third one-way valve, the pipeline connecting the first heat exchanger of the heat pump to the four-way valve only passes through the refrigeration expansion valve or the heating expansion valve.

4. The composite heat recovery type dual-cooling-source air conditioning unit according to claim 1, characterized in that: In cooling mode, the air is pre-cooled and dehumidified in the preliminary treatment zone, and then further dehumidified and reheated in the deep treatment zone. In heating mode, air is preheated in the preliminary treatment zone, and then heated and reheated in the deep treatment zone. In heat recovery mode, the liquid circulation module recovers heat from the exhaust air and uses the recovered heat for air treatment in the preliminary treatment area.

5. A composite heat recovery type dual-source air conditioning unit according to claim 2, characterized in that: In heating mode, the heat pump module contains: The compressor compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant, which is then switched to the heating cycle via the four-way valve and the refrigerant electric ball valve, and flows sequentially through the second heat exchanger, the first heat exchanger, and the third heat exchanger of the heat pump. The high-temperature and high-pressure gaseous refrigerant condenses and releases heat in the second heat exchanger and the first heat exchanger of the heat pump, transforming into a medium-temperature and high-pressure liquid refrigerant, which heats and reheats the air entering the deep treatment zone, raising the air temperature. The refrigerant flowing through the first and second heat exchangers of the heat pump is throttled and depressurized through the heating expansion valve to form a low-temperature, low-pressure gas-liquid two-phase refrigerant. Then, the refrigerant exchanges energy with the liquid circulation module in the third heat exchanger of the heat pump, evaporates, and then returns to the compressor to complete the cycle. Driven by a circulation pump, the liquid circulation module forms a circulation loop, recovers heat from the exhaust air, and releases the recovered heat to the preliminary treatment area through the heat recovery coil, thereby preheating the air.

6. A composite heat recovery type dual-source air conditioning unit according to claim 5, characterized in that: In heating mode, the liquid circulation module forms a circulation loop under the drive of the circulation pump, and forms at least two working processes by switching the opening and closing of the first bypass electric regulating valve and the second bypass electric regulating valve: In the first working process, the first bypass electric regulating valve is closed and the second bypass electric regulating valve is closed. The circulating medium flows out of the exhaust heat recovery coil and enters the heat recovery coil. Heat is released in the heat recovery coil, which raises the temperature of the air flowing through the preliminary treatment zone. Then, it exchanges energy with the third heat exchanger of the heat pump and enters the exhaust heat recovery coil again. Heat is absorbed in the exhaust air in the exhaust heat recovery coil, which lowers the exhaust air temperature. Then it returns to the circulating pump. In the second working process, the first bypass electric regulating valve is opened and the second bypass electric regulating valve is closed. The circulating medium flows out of the exhaust heat recovery coil and is divided into two paths. One path enters the heat recovery coil to release heat, thereby increasing the temperature of the air flowing through the preliminary treatment zone. The other path bypasses through the first bypass electric regulating valve. After the two paths merge, they exchange energy with the third heat exchanger of the heat pump and then enter the exhaust heat recovery coil to absorb heat from the exhaust air, thereby reducing the exhaust air temperature. After that, the medium returns to the circulating pump.

7. A composite heat recovery type dual-source air conditioning unit according to claim 2, characterized in that: In cooling mode, the heat pump module contains: The compressor compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant is split into at least two paths, one of which enters the second heat exchanger of the heat pump. In the second heat exchanger of the heat pump, heat is released by condensation, which raises the temperature of the air flowing through the second heat exchanger of the heat pump. The refrigerant flowing out of the second heat exchanger of the heat pump merges with another high-temperature and high-pressure gaseous refrigerant and enters the four-way valve, then enters the third heat exchanger of the heat pump. In the third heat exchanger of the heat pump, it exchanges heat with the circulating medium in the liquid circulation module, and the refrigerant is cooled and converted into liquid refrigerant. The liquid refrigerant enters the refrigeration expansion valve through a one-way valve, where it is throttled and depressurized to form a low-temperature, low-pressure gas-liquid two-phase refrigerant. It then enters the first heat exchanger of the heat pump, where it evaporates and absorbs heat, thereby cooling and dehumidifying the air flowing through the first heat exchanger. The evaporated refrigerant returns to the compressor via a four-way valve to complete the cycle; The refrigerant flow rate in the second heat exchanger of the heat pump is regulated by a refrigerant electric ball valve to control the reheat temperature rise of the air. Driven by a circulation pump, the liquid circulation module forms a circulation loop, transferring heat from the exhaust air to the heat recovery coil to pre-cool the air in the preliminary treatment area.

8. A composite heat recovery type dual-source air conditioning unit according to claim 7, characterized in that: In cooling mode, the liquid circulation module forms a circulation loop under the drive of the circulation pump, and forms at least two working processes by switching the opening and closing of the first bypass electric regulating valve and the second bypass electric regulating valve: In the first working process, the first bypass electric regulating valve is closed and the second bypass electric regulating valve is closed. The circulating medium flows out of the exhaust heat recovery coil and enters the heat recovery coil. It exchanges heat with the air in the heat recovery coil, which lowers the temperature of the air flowing through the preliminary treatment zone. Then it enters the third heat exchanger of the heat pump for energy exchange, and then enters the exhaust heat recovery coil. Heat is released in the exhaust heat recovery coil, which raises the exhaust temperature. Then it returns to the circulating pump. In the second working process, the first bypass electric regulating valve is opened and the second bypass electric regulating valve is closed. The circulating medium flows out of the exhaust heat recovery coil and is divided into two paths. One path enters the heat recovery coil to exchange heat with the air, thereby reducing the temperature of the air flowing through the preliminary treatment zone. The other path bypasses through the first bypass electric regulating valve. After the two paths merge, they enter the third heat exchanger of the heat pump for heat exchange and temperature increase, and then enter the exhaust heat recovery coil to release heat, thereby increasing the exhaust temperature. After that, it returns to the circulating pump.

9. A composite heat recovery type dual-source air conditioning unit according to claim 4, characterized in that: In heat recovery mode, the heat pump module stops working, and the liquid circulation module forms a circulation loop under the drive of the circulation pump. The first bypass electric regulating valve is closed and the second bypass electric regulating valve is opened, so that the circulating medium circulates between the heat recovery coil and the exhaust heat recovery coil and transfers heat. When the air temperature on one side of the exhaust heat recovery coil is lower than the air temperature in the preliminary treatment zone, the circulating medium first absorbs heat from the air in the heat recovery coil, thereby reducing the air temperature flowing through the preliminary treatment zone. Then, it enters the exhaust heat recovery coil to release heat, thereby increasing the exhaust temperature. When the air temperature on one side of the exhaust heat recovery coil is higher than the air temperature in the preliminary treatment zone, the circulating medium first releases heat in the heat recovery coil, causing the air temperature flowing through the preliminary treatment zone to rise, and then enters the exhaust heat recovery coil to absorb the heat in the exhaust air, thus lowering the exhaust air temperature.

10. A composite heat recovery type dual-source air conditioning unit according to claim 2, characterized in that: In cooling mode, the water supply pipe provides high-temperature cold water to the hot and cold water coils to pre-cool and dehumidify the air; In heating mode, the water supply pipe provides hot water to the hot and cold water coils to preheat the air.

11. A composite heat recovery type dual-cooling-source air conditioning unit according to claim 10, characterized in that: In cooling mode, the water supply pipe provides the hot and cold water coils with high-temperature cold water above 10°C; In heating mode, the water supply pipe provides hot water at a temperature of 30°C or higher to the hot and cold water coils.

12. A composite heat recovery type dual-source air conditioning unit according to claim 2, characterized in that: The refrigerant electric ball valve is used to regulate the refrigerant flow rate entering the second heat exchanger of the heat pump, thereby regulating the reheat of the air in the deep treatment zone.

13. A composite heat recovery type dual-source air conditioning unit according to claim 2, characterized in that: The first bypass electric regulating valve is used to adjust the flow rate of the circulating medium into the heat recovery coil, so as to adjust the air pretreatment capacity in the preliminary treatment zone.

14. A composite heat recovery type dual-source air conditioning unit according to claim 2, characterized in that: The second bypass electric regulating valve is opened in heat recovery mode, and the circulating medium forms a bypass circulation path between the heat recovery coil and the exhaust heat recovery coil.

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