Heat pump composite type triple-effect heat recovery system and air conditioner

Abstract

The invention discloses a heat pump composite type triple-effect heat recovery system and an air conditioner. The heat recovery system comprises an air treatment unit and a liquid circulation unit. The air treatment unit comprises a heat recovery coil pipe, a reheating coil pipe and an exhaust heat recovery coil pipe, and the heat recovery coil pipe and the reheating coil pipe are sequentially arranged along an air inflow path; the liquid circulating unit comprises a circulating pump and a liquid pipeline, the circulating pump is sequentially connected with a reheating coil pipe, a heat recovery coil pipe and an exhaust heat recovery coil pipe through the liquid pipeline, and the exhaust heat recovery coil pipe is connected with the circulating pump through the liquid pipeline; wherein the circulating pump is used for driving liquid to flow in the liquid pipeline. The liquid circulation unit is matched with the heat recovery coil pipe and the reheating coil pipe, the heat recovery coil pipe recovers sensible heat energy of fresh air and sends the sensible heat energy to the reheating coil pipe to reheat the fresh air, and it is not needed to additionally consume energy to reheat dehumidified air; in addition, heat or cold in indoor air needing to be exhausted is recycled through the independent exhaust air heat recycling coil pipe, and energy waste is avoided.

Description

Technical Field

[0001] This application relates to the field of air dehumidification and exhaust heat recovery technology, and in particular to a heat pump composite triple-effect heat recovery system and an air conditioner. Background Technology

[0002] With increasing global demands for energy conservation, emission reduction, and high-quality indoor building environments, improving the energy efficiency of HVAC systems, a major component of building energy consumption, has become a core focus of industry development. In various public buildings, hospitals, laboratories, and other locations, to meet indoor hygiene and pressure balance requirements, a large amount of fresh outdoor air must be continuously introduced while a corresponding amount of indoor air is exhausted. This process results in the direct release of carefully processed indoor temperature and humidity energy into the atmosphere, causing significant energy waste.

[0003] To address this issue, air-to-air heat recovery devices (such as rotary and plate-fin heat exchangers) have become standard equipment in modern air conditioning systems. These devices effectively recover energy from exhaust air for pre-treatment of fresh air, thereby reducing the heating or cooling load on the fresh air. However, these traditional heat recovery methods have inherent limitations: First, their heat recovery efficiency is limited by the heat exchange temperature difference; in conditions with small temperature differences, such as during the spring and autumn transition seasons, the recovery efficiency is significantly reduced. Second, they typically only perform sensible heat exchange and cannot efficiently recover latent heat (humidity) energy. Most importantly, the energy grade recovered by traditional systems is limited, making it difficult to meet the precise control requirements of the air supply. For example, in summer, to dehumidify, the air often needs to be cooled below the dew point temperature and then reheated using electric heating or other methods to raise the air temperature to a comfortable level for the human body; this process involves significant energy waste.

[0004] On the other hand, heat pump technology, with its ability to elevate low-grade heat sources to a higher grade for utilization, is an ideal means to improve energy efficiency. Combining heat pump systems with liquid circulation heat recovery systems to construct integrated energy systems has become an important research direction in the industry. Therefore, developing a integrated system that deeply integrates exhaust energy recovery and heat pump technology, achieving efficient and stable operation under various functions and conditions, and precisely controlling temperature and humidity, is of paramount importance for promoting technological progress in the HVAC industry and reducing carbon emissions from building operations. Summary of the Invention

[0005] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a heat pump composite triple-effect heat recovery system, which can realize the recycling and reuse of energy inside the air conditioner, reducing energy consumption.

[0006] According to one embodiment of this application, a heat pump composite triple-effect heat recovery system includes: an air handling unit, which includes a heat recovery coil, a reheat coil, and an exhaust heat recovery coil, wherein the heat recovery coil and the reheat coil are arranged sequentially along the air inflow path, and the exhaust heat recovery coil is arranged on the air outflow path; and a liquid circulation unit, which includes a circulation pump and a liquid pipeline, wherein the circulation pump is sequentially connected to the reheat coil, the heat recovery coil, and the exhaust heat recovery coil through the liquid pipeline, and the exhaust heat recovery coil is connected to the circulation pump through the liquid pipeline; wherein the circulation pump is used to sequentially pump liquid into the reheat coil, the heat recovery coil, and the exhaust heat recovery coil, and to allow the liquid flowing out of the exhaust heat recovery coil to flow back to the circulation pump.

[0007] According to one embodiment of this application, the heat pump composite triple-effect heat recovery system further includes: a heat pump unit, which includes a compressor, refrigerant pipes, a four-way valve, a heating throttling mechanism, and a cooling throttling mechanism; the four-way valve includes a first port, a second port, a third port, and a fourth port; and an exhaust heat recovery unit, which includes a first heat exchanger, a second heat exchanger, and a third heat exchanger. The first heat exchanger is disposed on a liquid pipe between the circulating pump and the reheat coil, the second heat exchanger is disposed on a liquid pipe between the reheat coil and the heat recovery coil, and the third heat exchanger is disposed on a liquid pipe between the heat recovery coil and the exhaust heat recovery coil. The compressor is connected to the first heat exchanger via a refrigerant pipe, the first heat exchanger is connected to the first port of the four-way valve via a refrigerant pipe, the second port of the four-way valve is connected in series with the second heat exchanger, the cooling throttling mechanism, the heating throttling mechanism, and the third heat exchanger via a refrigerant pipe, the third heat exchanger is connected to the fourth port of the four-way valve, and the third port of the four-way valve is connected to the compressor.

[0008] According to one embodiment of this application, the heat pump unit includes a refrigerant direct pipe and a refrigerant electric ball valve. The compressor is connected to the first port of the four-way valve through the refrigerant direct pipe. The compressor can pump refrigerant into the four-way valve through the refrigerant direct pipe. The refrigerant electric ball valve is installed in the refrigerant direct pipe and is used to regulate the refrigerant flow rate into the refrigerant direct pipe.

[0009] According to one embodiment of this application, the heat pump unit includes a first one-way valve, which is disposed in a refrigerant pipe between a first heat exchanger and a first interface of a four-way valve. The first one-way valve is used to limit the flow of refrigerant from the first heat exchanger to the four-way valve.

[0010] According to one embodiment of this application, the refrigeration throttling mechanism includes a refrigeration expansion valve and a second check valve connected in parallel with the refrigeration expansion valve; the heating throttling mechanism includes a heating expansion valve and a third check valve connected in parallel with the heating expansion valve; the inlet of the second check valve is connected to a second heat exchanger through a refrigerant pipe, and the outlet of the second check valve is connected to the heating throttling mechanism through a refrigerant pipe; the inlet of the third check valve is connected to a third heat exchanger through a refrigerant pipe, and the outlet of the third check valve is connected to the refrigeration throttling mechanism through a refrigerant pipe.

[0011] According to one embodiment of this application, the liquid circulation unit includes a liquid direct pipe and a bypass electric regulating valve. The circulation pump is connected to the heat recovery coil through the liquid direct pipe, and the bypass electric regulating valve is disposed in the liquid direct pipe. The bypass electric regulating valve is used to regulate the liquid flow rate entering the liquid direct pipe.

[0012] According to one embodiment of this application, the air handling unit includes a hot and cold water coil, which is disposed between a heat recovery coil and a reheat coil along the air inlet direction. The hot and cold water coil is used to heat and / or cool the air flowing through it.

[0013] According to one embodiment of this application, a heat pump composite triple-effect heat recovery system includes: a heat pump unit, which includes a compressor, refrigerant pipes, a four-way valve, a heating throttling mechanism, and a cooling throttling mechanism; the four-way valve includes a first port, a second port, a third port, and a fourth port; an exhaust heat recovery unit, which includes a first heat exchanger and a third heat exchanger; the first heat exchanger is disposed on a liquid pipe between the circulating pump and the reheat coil, and the third heat exchanger is disposed on a liquid pipe between the heat recovery coil and the exhaust heat recovery coil; an air handling unit further includes a direct expansion coil, which is disposed between the heat recovery coil and the reheat coil along the air inflow direction; wherein, the compressor is connected to the first heat exchanger through refrigerant pipes, the first heat exchanger is connected to the first port of the four-way valve through refrigerant pipes, the second port of the four-way valve is sequentially connected to the direct expansion coil, the cooling throttling mechanism, the heating throttling mechanism, and the third heat exchanger through refrigerant pipes, the third heat exchanger is connected to the fourth port of the four-way valve; and the third port of the four-way valve is connected to the compressor.

[0014] According to one embodiment of this application, the liquid circulation unit includes a pressure regulating device, which is disposed in the liquid pipeline between the heat recovery coil and the circulation pump.

[0015] An air conditioner according to another embodiment of this application includes the above-described heat pump composite triple-effect heat recovery system.

[0016] The heat pump composite triple-effect heat recovery system according to the embodiments of this application has at least the following beneficial effects: by using the liquid circulation unit in conjunction with the heat recovery coil and the reheat coil, the fresh air is pre-cooled and reheated. The heat recovery coil recovers the sensible heat energy of the fresh air and sends it to the reheat coil to reheat the fresh air, eliminating the need to reheat the dehumidified air by means of electric heating, thus saving energy. In addition, through the independent exhaust heat recovery coil, the heat or cold energy in the indoor air to be exhausted can be recovered, avoiding energy waste.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of a heat pump composite triple-effect heat recovery system according to one embodiment of this application; Figure 2 This is a schematic diagram of another heat pump composite triple-effect heat recovery system according to one aspect of this application.

[0019] Figure label: 100. Air handling unit; 101. Heat recovery coil; 102. Hot and cold water coil; 103. Reheat coil; 104. Exhaust heat recovery coil; 105. Direct expansion coil; 200. Heat pump unit; 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. Refrigeration throttling mechanism; 210. Heating throttling mechanism; 211. Refrigerant piping; 212. Refrigerant straight-through piping; 300. Liquid circulation unit; 301. Circulation pump; 302. Pressure regulating device; 303. Bypass electric regulating valve; 304. Liquid pipeline; 305. Liquid straight pipeline; 400. Exhaust heat recovery unit; 401. First heat exchanger; 402. Second heat exchanger; 403. Third heat exchanger. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0024] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] The following is for reference. Figures 1 to 2 This application describes a heat pump-based triple-effect heat recovery system according to an embodiment of the present application.

[0026] Please refer to Figure 1One embodiment of the heat pump composite triple-effect heat recovery system includes an air handling unit 100 and a liquid circulation unit 300. The air handling unit 100 includes a heat recovery coil 101, a reheat coil 103, and an exhaust heat recovery coil 104. The heat recovery coil 101 and the reheat coil 103 are arranged sequentially along the air inflow path, and the exhaust heat recovery coil 104 is arranged along the air outflow path. The liquid circulation unit 300 includes a circulation pump 301 and a liquid pipe 304. The circulation pump 301 is connected to the liquid pipe. 304 is connected to the reheat coil 103, the reheat coil 103 is connected to the heat recovery coil 101 through the liquid pipe 304, the heat recovery coil 101 is connected to the exhaust heat recovery coil 104 through the liquid pipe 304, and the exhaust heat recovery coil 104 is connected to the circulation pump 301 through the liquid pipe 304; wherein, the circulation pump 301 is used to pump liquid sequentially into the reheat coil 103, the heat recovery coil 101 and the exhaust heat recovery coil 104 and to make the liquid flowing out of the exhaust heat recovery coil 104 flow back to the circulation pump 301.

[0027] like Figure 1 As shown, the heat pump composite triple-effect heat recovery system includes an air handling unit 100, which includes a heat recovery coil 101, a reheat coil 103, and an exhaust heat recovery coil 104. When the heat pump composite triple-effect heat recovery system is started, fresh air flows into the room through the heat recovery coil 101 and the reheat coil 103 in sequence, while the indoor air flows to the outside through the exhaust heat recovery coil 104.

[0028] In some embodiments, the air flowing into the room through the heat recovery coil 101 and the reheat coil 103 may not be outdoor fresh air, but may be indoor return air generated by the exhaust heat recovery coil 104 or air composed of a mixture of outdoor fresh air and indoor return air.

[0029] The heat pump composite triple-effect heat recovery system also includes a liquid circulation unit 300. The liquid circulation unit 300 includes a circulation pump 301 and circulation pipes. Liquid, specifically a heat transfer fluid, is injected into the circulation pipes. The circulation pump 301 is connected sequentially to the reheat coil 103, the heat recovery coil 101, and the exhaust heat recovery coil 104 along the flow direction of the heat transfer fluid via the liquid pipes 304. Finally, the exhaust heat recovery coil 104 is reconnected to the circulation pump 301 via the liquid pipes 304. Thus, the liquid circulation unit 300 forms a closed loop. The heat transfer fluid flows sequentially through the reheat coil 103, the heat recovery coil 101, and the exhaust heat recovery coil 104 under the action of the circulation pump 301, and then returns to the circulation pump 301.

[0030] Specifically, the circulation pump 301 is turned on, pressurizing the medium-temperature liquid inside and causing it to flow into the reheat coil 103. The medium-temperature liquid releases heat in the reheat coil 103, raising the temperature of the air flowing through it. At the same time, the medium-temperature liquid absorbs the coldness of the air, becoming a low-temperature liquid. The low-temperature liquid enters the heat recovery coil 101 along the liquid pipe 304. The low-temperature liquid absorbs heat from the air in the heat recovery coil 101, cooling the air flowing through it. At the same time, the liquid absorbs heat from the air, becoming a high-temperature liquid. The high-temperature liquid enters the exhaust heat recovery coil 104 along the liquid pipe 304. The high-temperature liquid releases heat in the exhaust heat recovery coil 104, raising the temperature of the air flowing through it. At the same time, the high-temperature liquid becomes a medium-temperature liquid and returns to the suction port of the circulation pump 301.

[0031] During the operation of the aforementioned liquid circulation unit 300, the air handling unit 100 introduces fresh air through the heat recovery coil 101. The low-temperature liquid flowing through the heat recovery coil 101 pre-cools the fresh air, saving energy required for subsequent condensation and dehumidification. After condensation and dehumidification, the air temperature needs to be lowered to the dew point temperature, which is often too low for the human body. Therefore, the air flows through the reheat coil 103 to absorb heat and reach a temperature suitable for the human body. In other words, through the combined use of the liquid circulation unit 300, heat recovery coil 101, and reheat coil 103, the fresh air is pre-cooled and reheated. The heat recovery coil 101 recovers the sensible heat energy of the fresh air and sends it to the reheat coil 103 for reheating, eliminating the need for reheating the dehumidified air through electric heating or other methods, thus saving energy.

[0032] Furthermore, after the liquid flows through the heat recovery coil 101, its temperature rises to become a high-temperature liquid. This high-temperature liquid flows along the liquid pipe 304 to the exhaust heat recovery coil 104. The indoor air discharged from the exhaust heat recovery coil 104 absorbs the heat from the high-temperature liquid, restoring the liquid to a medium-temperature state. The medium-temperature liquid can then return to the circulation pump 301 and continue participating in the closed loop of the aforementioned liquid circulation unit 300. Therefore, by installing the exhaust heat recovery coil 104 and the liquid circulation unit 300, the discharged indoor air can be used as a cooling device for the liquid circulation unit 300, preventing the treated indoor air with temperature and humidity controlled from being directly discharged into the atmosphere, thus avoiding energy waste.

[0033] In some embodiments, such as Figure 1As shown, the heat pump composite triple-effect heat recovery system also includes a heat pump unit 200 and an exhaust heat recovery unit 400. The heat pump unit 200 includes a compressor 201, a refrigerant pipe 211, a four-way valve 204, a heating throttling mechanism 210, and a cooling throttling mechanism 209. The four-way valve 204 includes a first interface, a second interface, a third interface, and a fourth interface. The exhaust heat recovery unit 400 includes a first heat exchanger 401, a second heat exchanger 402, and a third heat exchanger 403. The first heat exchanger 401 is disposed on the liquid pipe 304 between the circulating pump 301 and the reheat coil 103, and the second heat exchanger 402 is disposed between the reheat coil 103 and the heat recovery coil 101. A third heat exchanger 403 is installed on the liquid pipe 304 between the heat recovery coil 101 and the exhaust heat recovery coil 104. The compressor 201 is connected to the first heat exchanger 401 via a refrigerant pipe 211. The first heat exchanger 401 is connected to the first port of the four-way valve 204 via the refrigerant pipe 211. The second port of the four-way valve 204 is connected in series via the refrigerant pipe 211 to the second heat exchanger 402, the refrigeration throttling mechanism 209, the heating throttling mechanism 210, and the third heat exchanger 403. The third heat exchanger 403 is connected to the fourth port of the four-way valve 204. The third port of the four-way valve 204 is connected to the compressor 201.

[0034] It is worth noting that, with Figure 1 Taking the four-way valve 204 as an example, the first port of the four-way valve 204 is... Figure 1 The four-way valve 204 has four terminals: a, b, c, and d.

[0035] In other words, the outlet of compressor 201 is connected to the refrigerant inlet of the first heat exchanger 401 via refrigerant pipe 211, and the first port of four-way valve 204 is connected to the refrigerant outlet of the first heat exchanger 401; the second port of four-way valve 204 is connected to the inlet of the second heat exchanger 402 via refrigerant pipe 211, and the outlet of the second heat exchanger 402 is connected to the refrigeration throttling mechanism 209, the heating throttling mechanism 210 and the third heat exchanger 403 in sequence via refrigerant pipe 211; the other end of the third heat exchanger 403 is reconnected to four-way valve 204 via refrigerant pipe 211 and connected to the fourth port of four-way valve 204, and the third port of four-way valve 204 is connected to the inlet of compressor 201. Thus, heat pump unit 200 forms a closed-loop unit.

[0036] The first heat exchanger 401 is disposed on the liquid pipe 304 between the circulating pump 301 and the reheat coil 103; the second heat exchanger 402 is disposed on the liquid pipe 304 between the reheat coil 103 and the heat recovery coil 101; and the third heat exchanger 403 is disposed on the liquid pipe 304 between the heat recovery coil 101 and the exhaust heat recovery coil 104. Thus, the liquid pipe 304 of the liquid circulation unit 300 and the refrigerant pipe 211 of the heat pump unit 200 are coupled in the first heat exchanger 401, the second heat exchanger 402, and the third heat exchanger 403, enabling the heat pump unit 200 to exchange energy with the liquid circulation unit 300.

[0037] The following describes in detail the workflow of the heat pump composite triple-effect heat recovery system of this application, taking the heat pump system in heating mode and the heat pump unit 200 in cooling mode.

[0038] When the heat pump unit 200 is in heating mode, please refer to [the relevant documentation]. Figure 1 At this time, the second port of the four-way valve 204 can only discharge refrigerant, and the fourth port can only receive refrigerant. The working process of the heat pump composite triple-effect heat recovery system is as follows: The high-temperature, high-pressure refrigerant discharged by the compressor 201 is sent to the first heat exchanger 401; the liquid in the liquid circulation unit 300 is heated by the first heat exchanger 401 and becomes a high-temperature liquid. After heat exchange in the first heat exchanger 401, the refrigerant becomes a medium-temperature refrigerant. The high-temperature liquid then flows into the reheat coil 103 to release heat and raise the temperature of the air flowing through the reheat coil 103. The high-temperature liquid absorbs the coldness of the air and becomes a medium-temperature liquid.

[0039] The sub-high temperature refrigerant flowing out of the first heat exchanger 401 enters the first port of the four-way valve 204 and flows out through the second port of the four-way valve 204, flowing to the second heat exchanger 402; the medium temperature liquid in the liquid circulation unit 300 flows out from the reheat coil 103 and flows to the second heat exchanger 402; the sub-high temperature refrigerant exchanges heat with the medium temperature liquid flowing through the second heat exchanger 402, the medium temperature liquid is heated to form a high temperature liquid, and the refrigerant is condensed.

[0040] Then, the refrigerant flowing out of the second heat exchanger 402 enters the heating throttling mechanism 210 for throttling and pressure reduction, forming a low-temperature, low-pressure refrigerant, which flows to the third heat exchanger 403; the medium-temperature liquid is heated in the second heat exchanger 402 to form a high-temperature liquid, which enters the heat recovery coil 101 along the liquid pipe 304 and releases heat to raise 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 medium-temperature liquid, which flows along the liquid pipe 304 to the third heat exchanger 403; the low-temperature, low-pressure refrigerant at the third heat exchanger 403 exchanges heat with the medium-temperature liquid flowing through the third heat exchanger 403, and the medium-temperature liquid is cooled to form a low-temperature liquid, and the refrigerant evaporates.

[0041] The refrigerant flows out from the third heat exchanger 403 and enters the fourth port of the four-way valve 204, and then returns to the inlet of the compressor 201 through the third port of the four-way valve 204. The low-temperature liquid flowing out from the third heat exchanger 403 flows to the exhaust heat recovery coil 104, where it absorbs heat and cools the indoor air discharged through the exhaust heat recovery coil 104. At the same time, the low-temperature liquid becomes a medium-temperature liquid, which returns to the inlet of the circulation pump 301 along the liquid pipe 304. Thus, both the heat pump unit 200 and the liquid circulation unit 300 have completed one heating cycle.

[0042] As can be seen from the above, during the heating process, with the participation of the heat pump unit 200 and the exhaust heat recovery unit 400, the liquid circulation unit 300 can actively recover the heat of the indoor air to be discharged. The heat pump unit 200 then upgrades this low-grade energy into high-grade energy, forming a higher-temperature heat source that acts on the fresh air entering the room, thereby improving the quality and utilization value of the recovered energy and achieving ultra-high energy efficiency heating.

[0043] When the heat pump unit 200 is operating in cooling mode, please refer to [the relevant documentation]. Figure 1 At this time, the second port of the four-way valve 204 can only receive refrigerant, and the fourth port can only discharge refrigerant. The working process of the heat pump composite triple-effect heat recovery system is as follows: The high-temperature, high-pressure refrigerant discharged by the compressor 201 is sent to the first heat exchanger 401; the liquid in the liquid circulation unit 300 is heated by the first heat exchanger 401 and becomes a high-temperature liquid. After heat exchange in the first heat exchanger 401, the refrigerant becomes a secondary high-temperature refrigerant. The high-temperature liquid then flows into the reheat coil 103 to release heat, which raises the temperature of the air flowing through the reheat coil 103. The air is heated to a temperature suitable for the human body, and the high-temperature liquid absorbs the coldness of the air and becomes a medium-temperature liquid.

[0044] The medium-temperature liquid flowing out of the reheat coil 103 flows to the second heat exchanger 402; the sub-high temperature refrigerant flowing out of the first heat exchanger 401 enters the first port of the four-way valve 204 and flows out through the fourth port of the four-way valve 204. The sub-high temperature refrigerant flows through the third heat exchanger 403 and reaches the refrigeration throttling mechanism 209 for throttling and pressure reduction, forming a low-temperature, low-pressure refrigerant. The refrigerant flows to the second heat exchanger 402 and exchanges heat with the medium-temperature liquid flowing through the second heat exchanger 402. The medium-temperature liquid is cooled to a low-temperature liquid, and the refrigerant evaporates.

[0045] The cryogenic liquid continues to flow along the liquid pipe 304 to the heat recovery coil 101. The cryogenic liquid absorbs heat in the heat recovery coil 101, which pre-cools and lowers the outdoor fresh air flowing through the heat recovery coil 101. This can more effectively pre-cool and pre-dehumidify the high-temperature and high-humidity outdoor fresh air. The cryogenic liquid absorbs the heat of the air and becomes a medium-temperature liquid. The refrigerant flows out from the second heat exchanger 402 and enters the second port of the four-way valve 204, and returns to the inlet of the compressor 201 through the third port of the four-way valve 204.

[0046] Then, the medium-temperature liquid flowing out of the heat recovery coil 101 enters the third heat exchanger 403, and the sub-high-temperature refrigerant flowing out of the fourth port of the four-way valve 204 flows to the third heat exchanger 403 and exchanges heat with the medium-temperature liquid flowing through the third heat exchanger 403. The medium-temperature liquid is heated to form a high-temperature liquid, and the refrigerant is condensed. The high-temperature liquid enters the exhaust heat recovery coil 104 and releases heat in the exhaust heat recovery coil 104 to raise the temperature of the indoor air flowing out of the exhaust heat recovery coil 104. In other words, the high-temperature liquid absorbs cold energy in the exhaust heat recovery coil. The high-temperature liquid absorbs cold energy to form a medium-temperature liquid and returns to the inlet of the circulating pump 301. The condensed refrigerant continues to flow to the aforementioned refrigeration throttling mechanism 209 to complete one cycle of the heat pump unit 200.

[0047] As can be seen from the above, during the cooling process, with the participation of the heat pump unit 200 and the exhaust heat recovery unit 400, the liquid circulation unit 300 can actively recover the cold energy of the indoor air to be exhausted. The heat pump unit 200 then upgrades this low-grade energy to high-grade energy, forming a cold source at a lower temperature that acts on the incoming fresh air. At the same time, the heat recovery coil 101 pre-cools and pre-dehumidifies the incoming outdoor fresh air, absorbs the heat of the outdoor fresh air and applies it to the reheat coil 103. This solves the energy waste caused by the traditional system of cooling first and then heating to maintain humidity, improves the quality and utilization value of the recovered energy, and achieves an ultra-high energy efficiency dehumidification effect.

[0048] In some embodiments, such as Figure 1 As shown, the heat pump unit 200 includes a refrigerant direct pipe 212 and a refrigerant electric ball valve 202. The compressor 201 is connected to the first port of the four-way valve 204 through the refrigerant direct pipe 212. The compressor 201 can pump refrigerant into the four-way valve 204 through the refrigerant direct pipe 212. The refrigerant electric ball valve 202 is installed in the refrigerant direct pipe 212 and is used to regulate the refrigerant flow rate into the refrigerant direct pipe 212. That is, by controlling the opening degree of the refrigerant electric ball valve 202, the refrigerant flow rate through the first heat exchanger 401 can be adjusted, thereby controlling the temperature rise of the liquid flowing through the first heat exchanger 401, and thus regulating the temperature of the fresh air supplied to the room by the air handling unit 100.

[0049] Furthermore, such as Figure 1As shown, the heat pump unit 200 includes a first check valve 203. The first check valve 203 is disposed on the refrigerant pipe 211 between the first heat exchanger 401 and the first port of the four-way valve 204. The first check valve 203 is used to limit the flow of refrigerant from the first heat exchanger 401 to the four-way valve 204. That is, a first check valve 203 is provided between the first heat exchanger 401 and the four-way valve 204. The inlet of the first check valve 203 is connected to the first heat exchanger 401, and the outlet of the first check valve 203 is connected to the first port of the four-way valve 204. The first check valve 203 can prevent the refrigerant pumped into the four-way valve 204 through the refrigerant straight pipe 212 from flowing back to the first heat exchanger 401.

[0050] Furthermore, such as Figure 1 As shown, the refrigeration throttling mechanism 209 includes a refrigeration expansion valve 205 and a second check valve 207 connected in parallel with the refrigeration expansion valve 205; the heating throttling mechanism 210 includes a heating expansion valve 206 and a third check valve 208 connected in parallel with the heating expansion valve 206; the inlet of the second check valve 207 is connected to the second heat exchanger 402 through a refrigerant pipe 211, and the outlet of the second check valve 207 is connected to the heating throttling mechanism 210 through a refrigerant pipe 211; the inlet of the third check valve 208 is connected to the third heat exchanger 403 through a refrigerant pipe 211, and the outlet of the third check valve 208 is connected to the refrigeration throttling mechanism 209 through a refrigerant pipe 211.

[0051] In other words, such as Figure 1 As shown, the refrigeration expansion valve 205 and the second one-way valve 207 are connected in parallel to form a refrigeration throttling mechanism 209. The inlet of the refrigeration throttling mechanism 209 is connected to the outlet of the second one-way valve 207, and the outlet of the refrigeration throttling mechanism 209 is connected to the inlet of the second one-way valve 207. The heating expansion valve 206 and the third one-way valve 208 are connected in parallel to form a heating throttling mechanism 210. The inlet of the heating throttling mechanism 210 is connected to the outlet of the third one-way valve 208, and the outlet of the heating throttling mechanism 210 is connected to the inlet of the third one-way valve 208. In this way, when the heat pump unit 200 is in heating mode, the refrigerant flowing out from the second heat exchanger 402 passes through the second one-way valve 207 of the refrigeration throttling mechanism 209 and then enters the heating expansion valve 206 of the heating throttling unit for throttling; when the heat pump unit 200 is in cooling mode, the refrigerant flowing out from the third heat exchanger 403 passes through the third one-way valve 208 of the heating throttling mechanism 210 and then enters the refrigeration expansion valve 205 of the refrigeration throttling unit for throttling.

[0052] In some embodiments, such as Figure 1As shown, the liquid circulation unit 300 includes a liquid direct pipe 305 and a bypass electric regulating valve 303. The circulation pump 301 is connected to the heat recovery coil 101 through the liquid direct pipe 305. The bypass electric regulating valve 303 is installed in the liquid direct pipe 305 and is used to regulate the liquid flow rate into the liquid direct pipe 305. That is, by controlling the opening of the bypass electric regulating valve 303, the flow rate of liquid flowing directly to the heat recovery coil 101 and the flow rate of liquid flowing through the first heat exchanger 401 can be adjusted, thereby controlling the temperature rise of the liquid flowing through the first heat exchanger 401 and the heat exchange of the air flowing through the heat recovery coil 101, and thus regulating the temperature of the fresh air supplied to the room by the air handling unit 100.

[0053] Furthermore, such as Figure 1 As shown, the air handling unit 100 includes a hot and cold water coil 102, which is positioned between the heat recovery coil 101 and the reheat coil 103 along the air inlet direction. The hot and cold water coil 102 is used to heat and / or cool the air flowing through it. That is, when the heat pump unit 200 is operating in heating mode, a high-temperature liquid is introduced into the hot and cold water coil to heat the outdoor fresh air; when the heat pump unit 200 is operating in cooling or dehumidification mode, a low-temperature liquid is introduced into the hot and cold water coil to condense the outdoor fresh air, thereby reducing the temperature and humidity of the outdoor fresh air. It is worth noting that the reheat coil 103 heats the air processed by the hot and cold water coil 102. When the heat pump unit 200 is in heating operation, the reheat coil 103 uses the heat obtained from the exhaust heat recovery coil 104 to further heat the air, achieving high-efficiency heating operation. When the heat pump unit 200 is in cooling operation, the heat recovery coil 101 uses the cold energy obtained from the exhaust heat recovery coil 104 to pre-cool the air, achieving high-efficiency dehumidification or cooling operation.

[0054] The exhaust heat recovery unit 400 includes a first heat exchanger 401 and a third heat exchanger 403. The first heat exchanger 401 is disposed on the liquid pipeline 304 between the circulating pump 301 and the reheat coil 103, and the third heat exchanger 403 is disposed on the liquid pipeline 304 between the heat recovery coil 101 and the exhaust heat recovery coil 104. In some embodiments, see Figure 2 This application provides a simplified heat pump composite triple-effect heat recovery system, in Figure 1 Based on the heat pump composite triple-effect heat recovery system shown, Figure 2The heat pump composite triple-effect heat recovery system shown has an added direct expansion coil 105 and the removal of the second heat exchanger 402. The direct expansion coil 105 is set between the cold and hot water coil 102 and the reheat coil 103 along the direction of outdoor fresh air inflow. The second port of the four-way valve 204 is connected to the direct expansion coil 105, the refrigeration throttling mechanism 209, the heating throttling mechanism 210 and the third heat exchanger 403 in sequence through the refrigerant pipe 211.

[0055] The following describes in detail the application under the conditions of heat pump system heating operation and heat pump unit 200 cooling operation, respectively. Figure 2 The working process of the heat pump composite triple-effect heat recovery system is shown.

[0056] When the heat pump unit 200 is in heating mode, please refer to [the relevant documentation]. Figure 2 At this time, the second port of the four-way valve 204 can only discharge refrigerant, and the fourth port can only receive refrigerant. The working process of the heat pump composite triple-effect heat recovery system is as follows: The high-temperature, high-pressure refrigerant discharged by the compressor 201 is sent to the first heat exchanger 401. The liquid in the liquid circulation unit 300 is heated by the first heat exchanger 401 and becomes a high-temperature liquid. After heat exchange in the first heat exchanger 401, the refrigerant becomes a medium-temperature refrigerant. The high-temperature liquid then flows into the reheat coil 103 and releases heat to raise the temperature of the air flowing through the reheat coil 103. The high-temperature liquid absorbs the coldness of the air and becomes a medium-temperature liquid. The medium-temperature liquid flowing out of the reheat coil 103 enters the heat recovery coil 101. The medium-temperature liquid releases heat in the heat recovery coil 101 and raises 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 medium-low-temperature liquid.

[0057] The sub-high temperature refrigerant flowing out of the first heat exchanger 401 enters the first port of the four-way valve 204 and flows out through the second port of the four-way valve 204. The refrigerant flows to the direct expansion coil 105 and exchanges heat with the air flowing through the direct expansion coil 105. The air is heated and the refrigerant is condensed.

[0058] Then, the refrigerant flowing out of the direct expansion coil 105 enters the heating throttling mechanism 210 for throttling and pressure reduction, forming a low-temperature, low-pressure refrigerant, which flows to the third heat exchanger 403; the sub-low-temperature liquid flowing out of the heat recovery coil 101 flows along the liquid pipe 304 to the third heat exchanger 403; the low-temperature, low-pressure refrigerant at the third heat exchanger 403 exchanges heat with the medium-temperature liquid flowing through the third heat exchanger 403, the sub-low-temperature liquid is cooled to form a low-temperature liquid, and the refrigerant evaporates.

[0059] The refrigerant flows out from the third heat exchanger 403 and enters the fourth port of the four-way valve 204, and then returns to the inlet of the compressor 201 through the third port of the four-way valve 204. The low-temperature liquid flowing out from the third heat exchanger 403 flows to the exhaust heat recovery coil 104, where it absorbs heat and cools the indoor air discharged through the exhaust heat recovery coil 104. At the same time, the low-temperature liquid becomes a medium-temperature liquid, which returns to the inlet of the circulation pump 301 along the liquid pipe 304. Thus, both the heat pump unit 200 and the liquid circulation unit 300 have completed one heating cycle.

[0060] When the heat pump unit 200 is operating in cooling mode, please refer to [the relevant documentation]. Figure 2 At this time, the second port of the four-way valve 204 can only receive refrigerant, and the fourth port can only discharge refrigerant. The working process of the heat pump composite triple-effect heat recovery system is as follows: The high-temperature, high-pressure refrigerant discharged by the compressor 201 is sent to the first heat exchanger 401; the liquid in the liquid circulation unit 300 is heated by the first heat exchanger 401 and becomes a high-temperature liquid. After heat exchange in the first heat exchanger 401, the refrigerant becomes a secondary high-temperature refrigerant. The high-temperature liquid then flows into the reheat coil 103 to release heat, which raises the temperature of the air flowing through the reheat coil 103. The air is heated to a temperature suitable for the human body, and the high-temperature liquid absorbs the coldness of the air and becomes a medium-temperature liquid.

[0061] The medium-temperature liquid flowing out of the reheat coil 103 flows to the heat recovery coil 101. The medium-temperature liquid absorbs heat in the heat recovery coil 101, which cools the air flowing through the heat recovery coil 101. At the same time, the liquid absorbs heat from the outdoor fresh air and becomes a secondary high-temperature liquid. The secondary high-temperature liquid flowing out of the heat recovery coil 101 flows into the third heat exchanger 403. The refrigerant flowing out through the fourth port of the four-way valve 204 flows to the third heat exchanger 403 and exchanges heat with the secondary high-temperature liquid flowing through the third heat exchanger 403. The secondary high-temperature liquid is heated and the refrigerant is condensed.

[0062] The high-temperature liquid flowing out of the third heat exchanger 403 enters the exhaust heat recovery coil 104, where it releases heat, raising the temperature of the air flowing through it. Simultaneously, the liquid becomes a medium-temperature liquid and returns to the inlet of the circulating pump 301. The condensed refrigerant flowing out of the third heat exchanger 403 enters the refrigeration throttling mechanism 209 for throttling. After throttling, the refrigerant becomes a low-temperature, low-pressure refrigerant, which then flows into the direct expansion coil 105, exchanging heat with the outdoor fresh air flowing through it. The air is cooled, and the refrigerant evaporates. The refrigerant flowing out of the direct expansion coil 105 enters the second port of the four-way valve 204, and then returns to the inlet of the compressor 201 via the third port of the four-way valve 204.

[0063] In some embodiments, such as Figure 1As shown, the liquid circulation unit 300 includes a pressure regulating device 302, which is disposed in the liquid pipeline 304 between the heat recovery coil 101 and the circulation pump 301. That is, the liquid circulation unit 300 has a pressure regulating device 302 installed on the liquid pipeline 304. The pressure regulating device 302 is formed as a pressure regulating tank, which can receive liquid from the liquid pipeline 304 or replenish liquid to the liquid pipeline 304. When the liquid in the liquid pipeline 304 expands in volume due to temperature changes, the pressure regulating tank receives the liquid from the liquid pipeline 304 to maintain the pressure of the liquid pipeline 304 within a safe range. When the liquid in the liquid pipeline 304 contracts in volume due to temperature changes, the pressure regulating tank replenishes liquid to the liquid pipeline 304, thereby stably maintaining the pressure within the system pipelines and equipment within a safe range.

[0064] This application also provides an air conditioner that includes the aforementioned heat pump composite triple-effect heat recovery system. Through the combined use of a liquid circulation unit 300 with heat recovery coil 101 and reheat coil 103, it pre-cools and reheats fresh air. The heat recovery coil 101 recovers the sensible heat energy of the fresh air and sends it to the reheat coil 103 for reheating, eliminating the need for reheating the dehumidified air through electric heating or other methods, thus saving energy. Furthermore, through an independent exhaust heat recovery coil 104, it can recover heat or cold energy from the exhaust air, avoiding energy waste. The heat pump unit 200 actively enhances energy recovery efficiency, actively upgrading the low-to-medium grade energy recovered by the heat recovery coil 101 and exhaust heat recovery coil 104 to high-grade energy, forming a higher-temperature heat source or a lower-temperature cold source, thus improving the quality and utilization value of the recovered energy.

[0065] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A heat pump combined triple-effect heat recovery system, characterized by, Comprise: An air handling unit comprising a heat recovery coil, a reheat coil and an exhaust heat recovery coil, the heat recovery coil and the reheat coil being arranged in sequence along a path of air inflow, the exhaust heat recovery coil being arranged on a path of air outflow; A liquid circulating unit comprising a circulating pump and a liquid pipe, the circulating pump being connected to the reheat coil, the heat recovery coil and the exhaust heat recovery coil in sequence through the liquid pipe, the exhaust heat recovery coil being connected to the circulating pump through the liquid pipe; Wherein the circulating pump is used to pump liquid into the reheat coil, the heat recovery coil and the exhaust heat recovery coil in sequence and make the liquid flowing out of the exhaust heat recovery coil flow back to the circulating pump.

2. The heat pump composite triple-effect heat recovery system according to claim 1, characterized in that, Also comprise: A heat pump unit comprising a compressor, a refrigerant pipe, a four-way valve, a heating throttling mechanism and a cooling throttling mechanism, the four-way valve comprising a first interface, a second interface, a third interface and a fourth interface; An exhaust heat recovery unit comprising a first heat exchanger, a second heat exchanger and a third heat exchanger, the first heat exchanger being arranged on the liquid pipe between the circulating pump and the reheat coil, the second heat exchanger being arranged on the liquid pipe between the reheat coil and the heat recovery coil, the third heat exchanger being arranged on the liquid pipe between the heat recovery coil and the exhaust heat recovery coil; Wherein the compressor is connected to the first heat exchanger through the refrigerant pipe, the first heat exchanger is connected to the first interface of the four-way valve through the refrigerant pipe, the second interface of the four-way valve is connected to the second heat exchanger, the cooling throttling mechanism, the heating throttling mechanism and the third heat exchanger in sequence through the refrigerant pipe, the third heat exchanger is connected to the fourth interface of the four-way valve; the third interface of the four-way valve is connected to the compressor.

3. The heat pump composite triple-effect heat recovery system according to claim 2, characterized in that, The heat pump unit comprises a refrigerant direct pipe and a refrigerant electric ball valve, the compressor is connected to the first interface of the four-way valve through the refrigerant direct pipe, the compressor can pump refrigerant into the four-way valve through the refrigerant direct pipe, the refrigerant electric ball valve is arranged on the refrigerant direct pipe, and the refrigerant electric ball valve is used to adjust the refrigerant flow entering the refrigerant direct pipe.

4. The heat pump composite triple-effect heat recovery system according to claim 2, wherein The heat pump unit comprises a first check valve arranged on the refrigerant pipe between the first heat exchanger and the first interface of the four-way valve, and the first check valve is used to limit the flow of refrigerant from the first heat exchanger to the four-way valve.

5. The heat pump composite triple-effect heat recovery system according to claim 2, wherein The cooling throttling mechanism comprises a cooling expansion valve and a second check valve connected in parallel with the cooling expansion valve; the heating throttling mechanism comprises a heating expansion valve and a third check valve connected in parallel with the heating expansion valve; the inlet of the second check valve is connected to the second heat exchanger through the refrigerant pipe, and the outlet of the second check valve is connected to the heating throttling mechanism through the refrigerant pipe; the inlet of the third check valve is connected to the third heat exchanger through the refrigerant pipe, and the outlet of the third check valve is connected to the cooling throttling mechanism through the refrigerant pipe.

6. The heat pump composite triple-effect heat recovery system according to claim 1, wherein The liquid circulation unit comprises a liquid through pipeline and a bypass electric regulating valve, the circulation pump is connected with the heat recovery coil through the liquid through pipeline, the bypass electric regulating valve is arranged on the liquid through pipeline, and the bypass electric regulating valve is used for regulating the liquid flow entering the liquid through pipeline.

7. The heat pump composite triple-effect heat recovery system according to claim 1, wherein The air treatment unit comprises a cold-hot water coil arranged between the heat recovery coil and the reheating coil along the air entering direction, and the cold-hot water coil is used for heating and / or refrigerating the air flowing therethrough.

8. The heat pump composite triple-effect heat recovery system according to claim 1, wherein Further comprising: a heat pump unit comprising a compressor, a refrigerant pipeline, a four-way valve, a heating throttling mechanism and a refrigerating throttling mechanism, the four-way valve comprising a first interface, a second interface, a third interface and a fourth interface; an exhaust air heat recovery unit comprising a first heat exchanger and a third heat exchanger, the first heat exchanger being arranged on the liquid pipeline between the circulation pump and the reheating coil, and the third heat exchanger being arranged on the liquid pipeline between the heat recovery coil and the exhaust air heat recovery coil; the air treatment unit further comprises a direct expansion coil arranged between the heat recovery coil and the reheating coil along the air inflow direction; wherein the compressor is connected with the first heat exchanger through the refrigerant pipeline, the first heat exchanger is connected with the first interface of the four-way valve through the refrigerant pipeline, the second interface of the four-way valve is connected with the direct expansion coil, the refrigerating throttling mechanism, the heating throttling mechanism and the third heat exchanger in sequence through the refrigerant pipeline, the third heat exchanger is connected with the fourth interface of the four-way valve, and the third interface of the four-way valve is connected with the compressor.

9. The heat pump composite triple-effect heat recovery system according to claim 1, wherein The liquid circulation unit comprises a constant pressure device arranged on the liquid pipeline between the exhaust air heat recovery coil and the circulation pump.

10. An air conditioner characterized by comprising: The heat pump composite triple-effect heat recovery system comprises the heat pump composite triple-effect heat recovery system according to any one of claims 1 to 9.

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