Energy-saving primary air return air conditioning system based on heat recovery of heat pump

Abstract

The utility model discloses an energy-saving primary air return air conditioning system based on heat recovery of a heat pump, which is characterized in that a cold circulation system comprises a compressor, a first four-way valve, a second four-way valve, an exhaust heat exchanger, a first throttle valve, a second throttle valve, a fresh air heat exchanger, a reheating heat exchanger, a third throttle valve and an air supply heat exchanger, the air circulation part comprises an air exhaust adjusting valve, an air return adjusting valve, a fresh air adjusting valve, an air exhaust fan, a heat exchange coil, a humidifier and an air supply fan. The primary air return air-conditioning system has the advantages that the primary air return air-conditioning system can recover cold energy in exhaust air in summer to conduct heat removal and dehumidification on fresh air and recover the fresh air and heat in supplied air to conduct secondary heating on the supplied air, and can recover heat in the exhaust air in winter to conduct preheating on the supplied fresh air and conduct secondary heating on the supplied air; the air supply cooling capacity requirement is reduced, meanwhile, the energy consumption loss caused by cold and heat offset of a conventional primary air return air conditioning system is reduced, the air treatment process of the conventional primary air return air conditioning system is optimized, and the energy consumption of the conventional primary air return air conditioning system is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of energy-saving primary return air conditioning system based on heat pump heat recovery, and specifically to the technical field of exhaust air total heat recovery air conditioner. BACKGROUND

[0002] Air conditioning energy consumption is huge in building, and air conditioning energy consumption accounts for 50% to 70% of total energy consumption, so it is necessary to take energy-saving measures for building air conditioning system. The proportion of air conditioning energy consumption in building energy consumption has been high, and the traditional central air conditioning system mixes outdoor fresh air and indoor return air for heat and humidity treatment, and then sends air to the building to eliminate the load in the building. Among them, fresh air load is one of the components of air conditioning load, generally accounting for 30% to 50% of air conditioning load, and even more than 60% in winter, and even more than 70% in public buildings with high personnel density. The use of exhaust air heat recovery device in air conditioning system can recover and utilize the cold / heat contained in exhaust air, and pre-treat fresh air, thereby reducing the energy consumption generated by treating fresh air. Studies have shown that when the heat recovery efficiency of the heat recovery device reaches 70%, it can effectively reduce 40% to 50% of heating energy consumption.

[0003] The most widely used air conditioning system at present is a primary return air system, and the primary return air conditioning system is a process in which the air conditioning system mixes indoor return air and outdoor fresh air sufficiently, and then cools the mixed air by a surface cooler, and then directly sends the air into an air conditioning room or sends the air into an air conditioning room after heating.

[0004] In refrigeration working condition, in order to remove water vapor in air, the evaporation temperature of the refrigerant of the traditional central air conditioning system needs to be much lower than the dew point temperature of air, which increases the temperature difference between the evaporation temperature and the condensation temperature of the refrigerating unit, and the lower evaporation temperature reduces the performance coefficient of the refrigerant group to some extent. At the same time, in the dew point air supply state, the indoor temperature and humidity parameters may deviate from the design working condition point, and reheating air will consume more energy; and the temperature and humidity of air are coupled in surface cooling treatment, which does not truly play the energy efficiency of the cold source, and is not conducive to the operation and control in later period. In the primary return air handling unit, the mixed air is cooled and dehumidified by a surface cooler, and then reheated by a reheater. This process of cooling and reheating is called "cold and heat offset", which causes a large amount of energy waste.

[0005] The secondary return air system generated for the shortcomings of the primary return air system saves the energy consumed by the reheater, but at the cost of reducing the dew point of the machine. As a result, on the one hand, the operation efficiency of the refrigeration system is reduced, and on the other hand, the use of natural cold source is more limited. At the same time, the secondary return air system also has poor anti-humidity disturbance ability, and the adjustment and control are not convenient, so its use is also restricted.

[0006] In addition, the conventional central air conditioning system has many loops, the system is complex, and the energy transmission process of each loop has huge transmission energy consumption, which is almost equal to the energy consumption of the cold and heat source, resulting in a large reduction of the performance coefficient of the entire air conditioning system.

[0007] Therefore, it is necessary to provide an energy-saving primary return air conditioning system based on heat pump heat recovery in view of the above problems. Content of the utility model

[0008] The utility model discloses a kind of energy-saving primary return air conditioning systems based on heat pump heat recovery, increase heat pump refrigerant circulation device in conventional primary return air conditioning system to optimize the air handling process of primary return air conditioning system, and innovatively fuse the different processing processes of heat pump cold and heat supply and primary return air conditioning system's fresh air, exhaust air and supply air, to solve the problem that a large amount of energy is wasted in the process of "cold and heat offsetting" caused by the reheat of mixed air after cooling and dehumidification by surface cooler in primary return air handling unit in the above background art.

[0009] To achieve the above object, the utility model provides the following technical scheme,

[0010] An energy-saving primary return air conditioning system based on heat pump heat recovery, comprising a cold cycle system and an air circulation system, the cold cycle system comprising a compressor, a first four-way valve, a second four-way valve, an exhaust air heat exchanger, a first throttling valve, a second throttling valve, a fresh air heat exchanger, a reheating heat exchanger, a third throttling valve, and a supply air heat exchanger.

[0011] The compressor comprises an exhaust port arranged at one end of the compressor and a suction port arranged at the other end of the compressor.

[0012] The first four-way valve is arranged outside the compressor and comprises four groups of ports, i.e., "a", "b", "c", and "d".

[0013] The second four-way valve is arranged outside the compressor and comprises four groups of ports, i.e., "e", "f", "g", and "h".

[0014] The exhaust air heat exchanger is arranged outside the compressor and is used for subsequent heat exchange of exhaust air entering the exhaust air port of the air cabinet.

[0015] The first throttling valve is arranged outside the exhaust air heat exchanger.

[0016] The second throttling valve is arranged outside the first throttling valve.

[0017] The fresh air heat exchanger is arranged outside the second thrott valve and used for the fresh air entering the fresh air outlet of the air conditioning air cabinet

[0018] The subsequent heat exchange is performed;

[0019] The reheat heat exchanger is arranged outside the compressor and used for the reheat exchange of the supply air entering the reheat section of the air conditioning air cabinet

[0020] The subsequent reheat exchange is performed;

[0021] The third thrott valve is arranged outside the supply air heat exchanger;

[0022] The supply air heat exchanger is used for indirectly exchanging heat between the air and the external cold and hot source circulating coil;

[0023] The air circulation system comprises an exhaust air adjusting valve, a return air adjusting valve, a fresh air adjusting valve, an exhaust air fan,

[0024] a heat exchange coil, a humidifier and a supply air fan; the exhaust air fan is arranged outside the exhaust air heat exchanger, and the exhaust air fan is used for exhausting part of the return air to the outdoor environment;

[0025] The heat exchange coil is arranged outside the return air adjusting valve and the fresh air adjusting valve;

[0026] The humidifier is arranged outside the reheat heat exchanger;

[0027] The supply air fan is arranged outside the humidifier.

[0028] Preferably, the cold circulation system further comprises

[0029] A first pipeline, two ends of the first pipeline are connected with the compressor and the a end of the first four-way valve respectively;

[0030] A second pipeline, two ends of the second pipeline are connected with the b end of the first four-way valve and the exhaust air heat exchanger respectively;

[0031] A third pipeline, two ends of the third pipeline are connected with the exhaust air heat exchanger and the first thrott valve respectively;

[0032] A fourth pipeline, two ends of the fourth pipeline are connected with the first thrott valve and the second thrott valve respectively;

[0033] A fifth pipeline, two ends of the fifth pipeline are connected with the second thrott valve and the fresh air heat exchanger respectively;

[0034] A sixth pipeline, two ends of the sixth pipeline are connected with the fresh air heat exchanger and the d end of the first four-way valve respectively;

[0035] A seventh pipeline, two ends of the seventh pipeline are connected with the c end of the first four-way valve and one end of the compressor respectively;

[0036] an eighth pipeline, two ends of the eighth pipeline being connected to the compressor and one end of the first check valve, respectively;

[0037] a ninth pipeline, two ends of the ninth pipeline being connected to the h end of the second four-way valve and the reheating heat exchanger, respectively;

[0038] a tenth pipeline, two ends of the tenth pipeline being connected to the e end of the second four-way valve and the other end of the first check valve, respectively;

[0039] an eleventh pipeline, two ends of the eleventh pipeline being connected to the third throttling valve and the reheating heat exchanger, respectively;

[0040] a twelfth pipeline, two ends of the twelfth pipeline being connected to the third throttling valve and the supply air heat exchanger, respectively;

[0041] a thirteenth pipeline, two ends of the thirteenth pipeline being connected to the g end of the second four-way valve and the supply air heat exchanger, respectively;

[0042] a fourteenth pipeline, two ends of the fourteenth pipeline being connected to one end of the compressor and the f end of the second four-way valve, respectively;

[0043] a fifteenth pipeline, two ends of the fifteenth pipeline L being connected to the second check valve and one end of the first throttling valve, respectively;

[0044] a first check valve, a cutoff end of the first check valve being connected to the exhaust port of the compressor, and a through end being connected to the e end of the second four-way valve;

[0045] a second check valve, a cutoff end of the second check valve being connected to one end of the first throttling valve and the second throttling valve, and a through end being connected to the e end of the third throttling valve.

[0046] Preferably, the air circulation system further comprises

[0047] an exhaust air regulating valve, the exhaust air regulating valve being arranged outside the exhaust air heat exchanger, and the exhaust air regulating valve being used to control the passing of a part of the return air at the return air section of the air conditioning cabinet to the exhaust air heat exchanger for heat exchange;

[0048] a return air regulating valve, the return air regulating valve being arranged outside the exhaust air regulating valve, and the return air regulating valve being used to control the passing of another part of the return air at the return air section of the air conditioning cabinet to the mixing section of the air conditioning cabinet;

[0049] a fresh air regulating valve, the fresh air regulating valve being arranged outside the fresh air heat exchanger, and the fresh air regulating valve being used to control the passing of the fresh air at the fresh air section of the air conditioning cabinet to the mixing section of the air conditioning cabinet;

[0050] an exhaust air fan, the exhaust air fan being arranged outside the exhaust air heat exchanger, and the exhaust air fan being used to exhaust a part of the return air to the outdoor environment.

[0051] A heat exchange coil is arranged outside the return air regulating valve and the fresh air regulating valve.

[0052] A humidifier is arranged outside the reheating heat exchanger.

[0053] An air supply fan is arranged outside the humidifier.

[0054] Preferably, when the exhaust air heat exchanger and the reheating heat exchanger are condensers, the fresh air heat exchanger and the air supply heat exchanger are evaporators.

[0055] Preferably, when the fresh air heat exchanger, the reheating heat exchanger and the air supply heat exchanger are condensers, the exhaust air heat exchanger is an evaporator.

[0056] Preferably, the first throttling valve, the second throttling valve and the third throttling valve are solenoid valves when they function as throttling valves.

[0057] Preferably, the exhaust air heat exchanger, the fresh air heat exchanger, the reheating heat exchanger and the air supply heat exchanger are connected to an external cold and hot source circulation coil to exchange heat with air indirectly or are connected to a refrigerant circulation device to exchange heat with air directly, preferably to a refrigerant circulation device to exchange heat with air directly.

[0058] Preferably, the exhaust air fan is a fan for air conditioning equipment in a cabinet or an exhaust air external pipeline, and the air supply fan is a fan for air conditioning equipment in a cabinet or an air supply external pipeline.

[0059] In summary, the present application has the following advantages:

[0060] 1. For the air conditioning process of a conventional primary return air conditioning system, the present application proposes a new primary return air conditioning system which combines a heat pump cold and heat supply circulation system with a primary return air conditioning air treatment.

[0061] 2. In summer conditions, the cold energy in the exhaust air can be recovered to dehumidify and cool the fresh air and the air supply, or the cold energy in the exhaust air can be recovered to dehumidify and cool the fresh air and the air supply while recovering the heat in the fresh air, the air supply and the outdoor air to secondarily heat the air supply. In winter conditions, the heat in the exhaust air can be recovered to heat the fresh air, or the heat in the exhaust air can be recovered to heat the fresh air and the air supply while secondarily heating the air supply, so that sensible heat and latent heat can be recovered.

[0062] 3. By using the heat in the fresh air and the exhaust air, the conventional primary return air conditioning system can greatly reduce the energy waste caused by cooling and dehumidifying the mixed air through a surface cooler and reheating the mixed air through an electric heater.

[0063] 4. The energy-saving primary return air conditioning system based on heat pump heat recovery realizes heat and moisture removal of fresh air and supply air in summer and preheating of fresh air in winter by using fresh air heat exchanger and supply air heat exchanger, and reduces energy consumption caused by "cold and heat offset" and energy waste caused by electric heating preheating of fresh air in winter in cold regions. BRIEF DESCRIPTION OF DRAWINGS

[0064] Figure 1 It is a schematic diagram of the energy-saving primary return air conditioning system.

[0065] In the figure, 1, compressor; 101, exhaust port of the first compressor; 102, suction port of the second compressor; 2, first four-way valve; 3, second four-way valve; 4, exhaust air heat exchanger; 5, first throttling valve; 6, second throttling valve; 7, fresh air heat exchanger; 8, reheating heat exchanger; 9, third throttling valve; 10, supply air heat exchanger; 11, first check valve; 12, second check valve.

[0066] 13, exhaust air regulating valve; 14, return air regulating valve; 15, fresh air regulating valve; 16, exhaust air fan; 17, heat exchange coil; 18, humidifier; 19, supply air fan.

[0067] L1, first pipeline; L2, second pipeline; L3, third pipeline; L4, fourth pipeline; L5, fifth pipeline; L6, sixth pipeline; L7, seventh pipeline; L8, eighth pipeline; L9, ninth pipeline; L10, tenth pipeline; L11, eleventh pipeline; L12, twelfth pipeline; L13, thirteenth pipeline; L14, fourteenth pipeline; L15, fifteenth pipeline. DETAILED DESCRIPTION

[0068] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0069] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Figure 1 The embodiments of the present application will be further described in detail.

[0070] An energy-saving primary return air conditioning system based on heat pump heat recovery, comprising a cold circulation system and an air circulation system, wherein the cold circulation system comprises a compressor 1, a first four-way valve 2, a second four-way valve 3, an exhaust air heat exchanger 4, a first throttling valve 5, a second throttling valve 6, a fresh air heat exchanger 7, a reheating heat exchanger 8, a third throttling valve 9, and a supply air heat exchanger 10.

[0071] A compressor 1, comprising an exhaust port 101 provided at one end of the compressor 1 and an intake port 102 provided at the other end of the compressor 1;

[0072] A first four-way valve 2, which is arranged outside the compressor 1 and consists of four groups of ports "a", "b", "c" and "d";

[0073] A second four-way valve 3 is provided outside the compressor 1 and is composed of four groups of ports, namely, “e”, “f”, “g” and “h”;

[0074] Exhaust heat exchanger 4, the exhaust heat exchanger 4 is arranged outside the compressor 1, and the exhaust heat exchanger 4 is used for subsequent heat exchange of the exhaust air entering the exhaust port of the air cabinet;

[0075] a first throttle valve 5 , which is arranged outside the exhaust heat exchanger 4 ;

[0076] a second throttle valve 6 , which is arranged outside the first throttle valve 5 ;

[0077] The fresh air heat exchanger 7 is arranged on the outside of the second throttle valve 6 and is used for subsequent heat exchange of the fresh air entering from the fresh air inlet of the air conditioner;

[0078] The reheat heat exchanger 8 is arranged outside the compressor 1 and is used for the air conditioning cabinet reheat section to enter

[0079] Supply air for subsequent reheat exchange;

[0080] The third throttle valve 9 is arranged outside the air supply heat exchanger 10;

[0081] The air supply heat exchanger 10 is used to indirectly exchange heat with the air for the external cold and heat source circulation coil;

[0082] The air circulation system includes an exhaust air regulating valve 13, a return air regulating valve 14, a fresh air regulating valve 15, an exhaust

[0083] air blower 16, heat exchange coil 17, humidifier 18 and air supply blower 19;

[0084] The exhaust regulating valve 13 is arranged outside the exhaust heat exchanger 4 and is used to control the return air from the return air section of the air conditioner to pass through the exhaust heat exchanger 4 for heat exchange;

[0085] The return air regulating valve 14 is arranged outside the exhaust regulating valve 13 and is used to control the return air from the return air section of the air conditioner to pass to the mixing section of the air conditioner;

[0086] The fresh air regulating valve 15 is arranged on the outside of the fresh air heat exchanger 7. The fresh air regulating valve 15 is used to control the fresh air at the fresh air section of the air conditioning cabinet to pass to the mixing section of the air conditioning cabinet.

[0087] Preferably, the cold circulation system further comprises

[0088] A first pipeline L1, wherein both ends of the first pipeline L1 are connected to the compressor 1 and the end a of the first four-way valve 2 respectively;

[0089] The second pipeline L2, the two ends of the second pipeline L2 are respectively connected to the b end of the first four-way valve 2 and the exhaust heat exchanger 4;

[0090] The third pipeline L3, both ends of which are connected to the exhaust heat exchanger 4 and the first throttle valve 5 respectively;

[0091] a fourth pipeline L4, both ends of which are connected to the first throttle valve 5 and the second throttle valve 6 respectively;

[0092] a fifth pipeline L5, the two ends of which are connected to the second throttle valve 6 and the fresh air heat exchanger 7 respectively;

[0093] The sixth pipeline L6, both ends of which are connected to the fresh air heat exchanger 7 and the end d of the first four-way valve 2 respectively;

[0094] a seventh pipeline L7, the two ends of which are respectively connected to the c-end of the first four-way valve 2 and one end of the compressor 1;

[0095] an eighth pipeline L8, the two ends of which are respectively connected to the compressor 1 and one end of the first one-way valve 11;

[0096] a ninth pipeline L9, the two ends of which are respectively connected to the h end of the second four-way valve 3 and the reheat heat exchanger 8;

[0097] a tenth pipeline L10, the two ends of which are respectively connected to the e end of the second four-way valve 3 and the other end of the first one-way valve 11;

[0098] an eleventh pipeline L11, wherein both ends of the eleventh pipeline L11 are respectively connected to the third throttle valve 9 and the reheat heat exchanger 8;

[0099] A twelfth pipeline L12, both ends of which are connected to the third throttle valve 9 and the air supply heat exchanger 10 respectively;

[0100] The thirteenth pipeline L13, both ends of which are connected to the g end of the second four-way valve 3 and the air supply heat exchanger 10 respectively;

[0101] A fourteenth pipeline L14, two ends of the fourteenth pipeline are connected with one end of the compressor 1 and the f end of the second four-way valve 3 respectively;

[0102] A fifteenth pipeline L15, two ends of the fifteenth pipeline L15 are connected with the second one-way valve 12 and one end of the first throttle valve 5 respectively;

[0103] A first one-way valve 11, the stop end of the first one-way valve 11 is connected to the exhaust port 101 of the compressor 1, and the through end is connected to the e end of the second four-way valve 3;

[0104] A second one-way valve 12, the stop end of the second one-way valve 12 is connected to one end of the first throttle valve 5 and the second throttle valve 6, and the through end is connected to the e end of the third throttle valve 9.

[0105] Preferably, the air circulation system further comprises

[0106] An exhaust air fan 16, the exhaust air fan 16 is arranged outside the exhaust air heat exchanger 4, and the exhaust air fan 16 is used to exhaust part of the return air to the outdoor environment;

[0107] A heat exchange coil 17, the heat exchange coil 17 is arranged outside the return air adjusting valve 14 and the fresh air adjusting valve 15;

[0108] A humidifier 18, the humidifier 18 is arranged outside the reheating heat exchanger 8;

[0109] A supply air fan 19, the supply air fan 19 is arranged outside the humidifier 18.

[0110] Further, when the exhaust air heat exchanger 4 and the reheating heat exchanger 8 are condensers, the fresh air heat exchanger 7 and the supply air heat exchanger 10 are evaporators.

[0111] Further, when the fresh air heat exchanger 7, the reheating heat exchanger 8 and the supply air heat exchanger 10 are condensers, the exhaust air heat exchanger 4 is an evaporator.

[0112] Further, the first throttle valve 5, the second throttle valve 6 and the third throttle valve 9 are solenoid valves when they play a throttling effect.

[0113] Further, the exhaust air heat exchanger 4, the fresh air heat exchanger 7, the reheating heat exchanger 8 and the supply air heat exchanger 10 can be indirectly heat-exchanged with air through external cold and hot source circulation coils or directly heat-exchanged with air through refrigerant circulation equipment, and are preferably directly heat-exchanged with air through refrigerant circulation equipment.

[0114] Further, the exhaust air fan 16 is an air conditioner air cabinet internal equipment or an exhaust air external pipeline partial fan; and the supply air fan 19 is an air conditioner air cabinet internal equipment or a supply air external pipeline partial fan.

[0115] The return air in the air-conditioned room enters through the air-conditioning air cabinet return air inlet, part of which enters the exhaust air passage through the exhaust air regulating valve 13 and exchanges heat with the exhaust air heat exchanger 4, and is then discharged to the outdoor environment by the exhaust air fan 16; the other part enters the air-conditioning air cabinet mixing section through the return air regulating valve 14 and mixes with the fresh air entering through the fresh air regulating valve 15, and the fresh air enters through the air-conditioning air cabinet fresh air inlet and exchanges heat with the fresh air heat exchanger 7 before entering the air-conditioning air cabinet mixing section; after mixing, the air successively completes heat and humidity treatment through the supply air heat exchanger 10, the heat exchange coil 17, the reheating heat exchanger 8 and the humidifier 18, and is then sent into the air-conditioned room through the supply air fan 19.

[0116] In the utility model, under the summer condition, the exhaust air heat exchanger 4 and the reheating heat exchanger 8 are condensers, the fresh air heat exchanger 7 and the supply air heat exchanger 10 are evaporators.

[0117] In the utility model, under the winter condition, the fresh air heat exchanger 7, the reheating heat exchanger 8 and the supply air heat exchanger 10 are condensers, and the exhaust air heat exchanger 4 is an evaporator.

[0118] The exhaust air heat exchanger 4, the fresh air heat exchanger 7, the reheating heat exchanger 8 and the supply air heat exchanger 10 can be indirectly heat-exchanged with air through the external cold and hot source (water, heat pipe working medium, heat conducting oil, etc.) circulating coil, or directly heat-exchanged with air through the refrigerant circulating device, and the refrigerant circulating device is preferably directly heat-exchanged with air.

[0119] The exhaust air fan 16 can be the air-conditioning air cabinet equipment or the exhaust air external pipeline fan; the supply air fan 19 can be the air-conditioning air cabinet equipment or the supply air external pipeline fan; the heat exchange coil can exist as a heat source under the winter condition or not; and the humidifier 18 can be located behind the reheating heat exchanger 8 or at other positions of the air-conditioning air cabinet according to different humidification modes (such as isothermal or isenthalpic).

[0120] Use example 1:

[0121] Under the summer condition, the energy-saving primary return air air-conditioning system based on heat pump heat recovery of the utility model is used as the summer refrigeration cycle to realize only fresh air heat recovery and secondary heating of the supply air.

[0122] The refrigerant cycle of the system is that the first throttling valve 5 is closed, the third throttling valve 9 is closed, the exhaust gas of the compressor 1 is condensed and heat is released in the reheating heat exchanger 8, the liquid working medium is throttled through the second throttling valve 6 and evaporated and absorbs heat in the fresh air heat exchanger 7, and the gaseous working medium flows through the d end of the first four-way valve 2 and the c end of the first four-way valve 2 and then returns to the compressor 1.

[0123] The air circulation of the system is as follows: the return air in the air-conditioned room enters through the air return port of the air conditioner cabinet, part of which enters the exhaust air passage and exchanges heat with the exhaust air heat exchanger 3 through the exhaust air regulating valve 13, and is then discharged to the outdoor environment by the exhaust air fan 16; the other part enters the air conditioner cabinet mixing section and mixes with the fresh air entering through the fresh air regulating valve 15, and the fresh air enters the air conditioner cabinet mixing section through the fresh air port and exchanges heat with the fresh air heat exchanger 6; after mixing, the air completes heat and humidity treatment in sequence through the heat exchange coil 17, the reheating heat exchanger 7 and the humidifier 18, and is then sent into the air-conditioned room through the supply air fan 19.

[0124] Use Example 2:

[0125] In the summer working condition, the energy-saving primary return air conditioning system based on heat pump heat recovery of the utility model realizes the secondary heating of the supply air while recycling the exhaust air cold energy and recycling the fresh air heat energy.

[0126] The refrigerant circulation of the system is as follows: the first throttling valve 5 is closed, the second throttling valve 6 is closed, the exhaust gas of the compressor 1 is condensed and releases heat in the reheating heat exchanger 8, the liquid working medium is throttled by the third throttling valve 9 and evaporates and absorbs heat in the supply air heat exchanger 10, and the gaseous working medium flows through the g end of the second four-way valve 3, the f end of the second four-way valve 3 and then returns to the compressor 1.

[0127] The air circulation of the system is as follows: the return air in the air-conditioned room enters through the air return port of the air conditioner cabinet, part of which enters the exhaust air passage and exchanges heat with the exhaust air heat exchanger 3 through the exhaust air regulating valve 13, and is then discharged to the outdoor environment by the exhaust air fan 16; the other part enters the air conditioner cabinet mixing section and mixes with the fresh air entering through the fresh air regulating valve 15, and the fresh air enters the air conditioner cabinet mixing section through the fresh air port and exchanges heat with the fresh air heat exchanger 6; after mixing, the air completes heat and humidity treatment in sequence through the heat exchange coil 17, the reheating heat exchanger 7 and the humidifier 18, and is then sent into the air-conditioned room through the supply air fan 19.

[0128] Use Example 3

[0129] In the summer working condition, the energy-saving primary return air conditioning system based on heat pump heat recovery of the utility model realizes the secondary heating of the supply air while recycling the exhaust air cold energy and recycling the fresh air heat energy.

[0130] The system refrigerant cycle is: the first throttling valve 5 is opened, the third throttilling valve 9 is closed, the exhaust of the compressor 1 flows through the a end of the first four-way valve 2, the b end of the first four-way valve 2 to the exhaust heat exchanger 4 to condense and release heat, another way to the reheating heat exchanger 8 to condense and release heat, the liquid state working medium flowing out of the exhaust heat exchanger 4 mixes with the liquid state working medium flowing out of the reheating heat exchanger 8 after the first throttling valve 5, then throttles through the second throttling valve 6 to evaporate and absorb heat in the fresh air heat exchanger 7, and the gaseous working medium flows through the d end of the first four-way valve 2, the c end of the first four-way valve 2 and then returns to the compressor 1.

[0131] The system air cycle is: the return air in the air-conditioned room enters through the air-conditioning air cabinet return air inlet, part of which enters the exhaust air passage and exchanges heat with the exhaust air heat exchanger 3 through the exhaust air regulating valve 13, and is then exhausted to the outdoor environment by the exhaust air fan 16; another part enters the air-conditioning air cabinet mixing section and mixes with the fresh air entering through the fresh air regulating valve 15, and the fresh air enters the air-conditioning air cabinet fresh air inlet and completes heat exchange with the fresh air heat exchanger 6 before entering the air-conditioning air cabinet mixing section; after mixing, the air completes heat and humidity treatment in turn through the heat exchange coil 17, the reheating heat exchanger 7 and the humidifier 18, and is then sent into the air-conditioned room through the supply air fan 19.

[0132] Use example 4

[0133] Under the summer working condition, the energy-saving primary return air air conditioning system based on heat pump heat recovery of the utility model realizes the working condition of simultaneously exhausting cold energy without recycling, recycling fresh air heat, taking heat from the supply air, and twice heating the supply air as a summer refrigeration cycle:

[0134] The system refrigerant cycle is: the first throttling valve 5 is closed, the exhaust of the compressor 1 condenses and releases heat in the reheating heat exchanger 8, the liquid state working medium flowing out of the reheating heat exchanger 8, part of the liquid state working medium throttles through the second throttling valve 6 to evaporate and absorb heat in the fresh air heat exchanger 7, the gaseous working medium flows through the d end of the first four-way valve 2, the c end of the first four-way valve 2 and then returns to the compressor 1, and another part of the liquid state working medium throttles through the third throttling valve 9 to evaporate and absorb heat in the supply air heat exchanger 10, the gaseous working medium flows through the g end of the second four-way valve 3, the f end of the second four-way valve 3 and then returns to the compressor 1.

[0135] The system air cycle is: the return air in the air-conditioned room enters through the air-conditioning air cabinet return air inlet, part of which enters the exhaust air passage and exchanges heat with the exhaust air heat exchanger 3 through the exhaust air regulating valve 13, and is then exhausted to the outdoor environment by the exhaust air fan 16; another part enters the air-conditioning air cabinet mixing section and mixes with the fresh air entering through the fresh air regulating valve 15, and the fresh air enters the air-conditioning air cabinet fresh air inlet and completes heat exchange with the fresh air heat exchanger 6 before entering the air-conditioning air cabinet mixing section; after mixing, the air completes heat and humidity treatment in turn through the heat exchange coil 17, the reheating heat exchanger 7 and the humidifier 18, and is then sent into the air-conditioned room through the supply air fan 19.

[0136] Use Example 5

[0137] In summer, the energy-saving primary return air conditioning system based on heat pump heat recovery of the utility model as summer refrigeration cycle realizes simultaneous exhaust air cooling recovery, fresh air heat recovery, air supply heat extraction, and secondary heating of air supply:

[0138] The refrigerant cycle of the system is as follows: the first throttling valve 5 is opened, the exhaust of the compressor 1 flows through the a end of the first four-way valve 2 and the b end of the first four-way valve 2 to the exhaust heat exchanger 4 to condense and release heat, and the other way to the reheating heat exchanger 8 to condense and release heat; the liquid state working medium flowing out of the exhaust heat exchanger 8 is mixed with the liquid state working medium flowing out of the reheating heat exchanger 8 after passing through the first throttling valve 5; a part of the liquid state working medium evaporates and absorbs heat in the fresh air heat exchanger 7 after throttling by the second throttling valve 6; the gaseous working medium flows through the d end of the first four-way valve 2 and the c end of the first four-way valve 2 and then returns to the compressor 1; and the other part of the liquid state working medium evaporates and absorbs heat in the air supply heat exchanger 10 after throttling by the third throttling valve 9; the gaseous working medium flows through the g end of the second four-way valve 3 and the f end of the second four-way valve 3 and then returns to the compressor 1.

[0139] The air cycle of the system is as follows: the return air in the air conditioning room enters through the air conditioning air cabinet return air inlet, a part of which enters the exhaust air passage and exchanges heat with the exhaust heat exchanger 3 through the exhaust air regulating valve 13 and is then exhausted to the outdoor environment by the exhaust air fan 16; the other part enters the air conditioning air cabinet mixing section and mixes with the fresh air entering through the fresh air regulating valve 15, and the fresh air enters through the air conditioning air cabinet fresh air inlet and completes heat exchange with the fresh air heat exchanger 6 before entering the air conditioning air cabinet mixing section; after mixing, the air completes heat and humidity treatment in sequence through the heat exchange coil 17, the reheating heat exchanger 7 and the humidifier 18 and is then sent into the air conditioning room through the air supply fan 19.

[0140] Use Example 6

[0141] In winter, the energy-saving primary return air conditioning system based on heat pump heat recovery of the utility model as winter heating cycle realizes simultaneous exhaust air heat recovery, fresh air heating, air supply without heating, and secondary heating of air supply:

[0142] The refrigerant cycle of the system is as follows: the second throttling valve 6 is opened and the third throttling valve 9 is closed, the exhaust of the compressor 1 flows through the a end of the first four-way valve 2 and the d end of the first four-way valve 2 to the fresh air heat exchanger 7 to condense and release heat, and the other way to the reheating heat exchanger 8 to condense and release heat; the liquid state working medium mixes with the liquid state working medium flowing out of the reheating heat exchanger 8 after passing through the second throttling valve 6, and then evaporates and absorbs heat in the exhaust heat exchanger 4 after passing through the first throttling valve 5; the gaseous working medium flows through the b end of the first four-way valve 2 and the c end of the first four-way valve 2 and then returns to the compressor 1.

[0143] The air circulation of the system is as follows: the return air in the air-conditioned room enters through the return air inlet of the air-conditioning air cabinet, part of which enters the exhaust air passage and exchanges heat with the exhaust air heat exchanger 3 through the exhaust air regulating valve 13, and is then discharged to the outdoor environment by the exhaust air fan 16; the other part enters the mixing section of the air-conditioning air cabinet and mixes with the fresh air entering through the fresh air regulating valve 15, and the fresh air enters the mixing section of the air-conditioning air cabinet through the fresh air inlet of the air-conditioning air cabinet and exchanges heat with the fresh air heat exchanger 6; after mixing, the air completes heat and humidity treatment in sequence through the heat exchange coil 17, the reheating heat exchanger 7 and the humidifier 18, and is then sent into the air-conditioned room through the supply air fan 19.

[0144] Use example 7

[0145] In winter working condition, the energy-saving primary return air conditioning system based on heat pump heat recovery of the utility model realizes the working condition of simultaneous exhaust air heat recovery, unheated fresh air and unheated supply air for heating in winter, and performs secondary heating on the supply air.

[0146] The refrigerant circulation of the system is as follows: the second throttling valve 6 is closed, the third throttling valve 9 is closed, the exhaust gas of the compressor 1 is condensed and releases heat in the reheating heat exchanger 8, the liquid working medium flowing out of the reheating heat exchanger 8 is evaporated and absorbs heat in the exhaust air heat exchanger 4 after passing through the first throttling valve 5, and the gaseous working medium flows through the b end of the first four-way valve 2 and the c end of the first four-way valve 2 and then returns to the compressor 1.

[0147] The air circulation of the system is as follows: the return air in the air-conditioned room enters through the return air inlet of the air-conditioning air cabinet, part of which enters the exhaust air passage and exchanges heat with the exhaust air heat exchanger 3 through the exhaust air regulating valve 13, and is then discharged to the outdoor environment by the exhaust air fan 16; the other part enters the mixing section of the air-conditioning air cabinet and mixes with the fresh air entering through the fresh air regulating valve 15, and the fresh air enters the mixing section of the air-conditioning air cabinet through the fresh air inlet of the air-conditioning air cabinet and exchanges heat with the fresh air heat exchanger 6; after mixing, the air completes heat and humidity treatment in sequence through the heat exchange coil 17, the reheating heat exchanger 7 and the humidifier 18, and is then sent into the air-conditioned room through the supply air fan 19.

[0148] Use example 8

[0149] In winter working condition, the energy-saving primary return air conditioning system based on heat pump heat recovery of the utility model realizes the working condition of simultaneous exhaust air heat recovery, unheated fresh air and heated supply air for heating in winter, and performs secondary heating on the supply air.

[0150] The refrigerant cycle of this system is as follows: the second throttle valve 6 is closed and the third throttle valve 9 is opened. The exhaust gas of the compressor 1 goes to the reheat heat exchanger 8 for condensation and heat release in one way, and flows through the h end of the second four-way valve 3 and the g end of the second four-way valve 3 to the supply air heat exchanger 10 for condensation and heat release in the other way. The liquid working medium passes through the third throttle valve 9 and is mixed with the liquid working medium flowing out of the reheat heat exchanger 8. Then, it passes through the first throttle valve 5 and evaporates in the exhaust air heat exchanger 4 to absorb heat. The gaseous working medium flows through the b end of the first four-way valve 2 and the c end of the first four-way valve 2 and then returns to the compressor 1.

[0151] The air circulation of the system is as follows: after the return air in the air-conditioned room enters through the return air outlet of the air-conditioning cabinet, a part of it enters the exhaust duct through the exhaust regulating valve 13 and exchanges heat with the exhaust heat exchanger 3, and is then discharged to the outdoor environment by the exhaust fan 16; the other part enters the mixing section of the air-conditioning cabinet through the return air regulating valve 14 and is mixed with the fresh air entering through the fresh air regulating valve 15. Before the fresh air enters the mixing section of the air-conditioning cabinet, it first enters through the fresh air outlet of the air-conditioning cabinet and completes heat exchange with the fresh air heat exchanger 6; the mixed air passes through the heat exchange coil 17, the reheat heat exchanger 7, and the humidifier 18 to complete heat and humidity treatment in sequence, and is then sent into the air-conditioned room through the supply air fan 19.

[0152] Use Example 9

[0153] Under winter conditions, this utility model's energy-saving single-return air conditioning system based on heat pump heat recovery is used as a winter heating cycle to simultaneously recover exhaust heat, heat fresh air, and heat supply air, performing secondary heating of the supply air:

[0154] The refrigerant cycle of this system is as follows: the second throttle valve 5 is opened, the exhaust gas of the compressor 1 first flows through the a end of the first four-way valve 2 and the d end of the first four-way valve 2 to the fresh air heat exchanger 7 for condensation and heat release, the second flow flows through the reheat heat exchanger 8 for condensation and heat release, the third flow flows through the h end of the second four-way valve 3 and the g end of the second four-way valve 3 to the supply air heat exchanger 10 for condensation and heat release, the liquid working medium passes through the third throttle valve 9 and is mixed with the liquid working medium flowing out of the reheat heat exchanger 8 and the liquid working medium after passing through the second throttle valve 6, and then evaporates and absorbs heat in the exhaust air heat exchanger 4 after passing through the first throttle valve 5, and the gaseous working medium flows through the b end of the first four-way valve 2 and the c end of the first four-way valve 2 and then returns to the compressor 1.

[0155] The air circulation of the system is as follows: the return air in the air-conditioned room enters through the return air inlet of the air-conditioning air cabinet, part of which enters the exhaust air passage and exchanges heat with the exhaust air heat exchanger 3, and is then discharged to the outdoor environment by the exhaust air fan 16; the other part enters the mixing section of the air-conditioning air cabinet and mixes with the fresh air entering through the fresh air regulating valve 15, the fresh air entering the mixing section of the air-conditioning air cabinet first enters through the fresh air inlet of the air-conditioning air cabinet and exchanges heat with the fresh air heat exchanger 6; after mixing, the air successively completes heat and humidity treatment through the heat exchange coil 17, the reheating heat exchanger 7 and the humidifier 18, and is then sent into the air-conditioned room by the supply air fan 19.

[0156] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalents of the essential elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be considered as limiting the claims involved.

Claims

1. An energy-saving primary return air conditioning system based on heat pump heat recovery, comprising a cold circulation system and an air circulation system, characterized in that: The cold circulation system comprises a compressor (1), a first four-way valve (2), a second four-way valve (3), an exhaust air heat exchanger (4), a first throttle valve (5), a second throttle valve (6), a fresh air heat exchanger (7), a reheat heat exchanger (8), a third throttle valve (9), and a supply air heat exchanger (10); A compressor (1), the compressor (1) comprising an exhaust port (101) provided at one end of the compressor (1) and an intake port (102) provided at the other end of the compressor (1); A first four-way valve (2), the first four-way valve (2) being arranged outside the compressor (1), the first four-way valve (2) being composed of four groups of ports, namely "a", "b", "c" and "d"; A second four-way valve (3), the second four-way valve (3) being arranged outside the compressor (1), the second four-way valve (3) being composed of four groups of ports, namely, "e", "f", "g" and "h"; An exhaust heat exchanger (4), the exhaust heat exchanger (4) being arranged outside the first four-way valve (2) and the second four-way valve (3), and the exhaust heat exchanger (4) being used for subsequent heat exchange of exhaust air entering from the exhaust port of the air conditioner; a first throttle valve (5), the first throttle valve (5) being arranged outside the exhaust heat exchanger (4); a second throttle valve (6), the second throttle valve (6) being arranged outside the first throttle valve (5); The fresh air heat exchanger (7) is arranged outside the second throttle valve (6) and is used for subsequent heat exchange of the fresh air entering from the fresh air inlet of the air conditioner; The reheat heat exchanger (8) is arranged outside the compressor (1) and is used for subsequent reheat exchange of the supply air entering the reheat section of the air conditioner; a third throttle valve (9) disposed outside the air supply heat exchanger (10); An air supply heat exchanger (10) is used to indirectly exchange heat between the external cold and hot source circulation coil and the air; The air circulation system includes an exhaust air regulating valve (13), a return air regulating valve (14), a fresh air regulating valve (15), an exhaust air fan (16), a heat exchange coil (17), a humidifier (18) and an air supply fan (19); an exhaust fan (16), the exhaust fan (16) being arranged outside the exhaust heat exchanger (4), and the exhaust fan (16) being used to discharge part of the return air into the outdoor environment; a heat exchange coil (17), wherein the heat exchange coil (17) is arranged outside the return air regulating valve (14) and the fresh air regulating valve (15); a humidifier (18), the humidifier (18) being arranged outside the reheat heat exchanger (8); An air supply fan (19), wherein the air supply fan (19) is arranged outside the humidifier (18).

2. The energy-saving primary return air air conditioning system based on heat pump heat recovery according to claim 1, characterized in that: The cooling system also includes A first pipeline (L1), wherein both ends of the first pipeline (L1) are respectively connected to the compressor (1) and the end a of the first four-way valve (2); a second pipeline (L2), wherein both ends of the second pipeline (L2) are respectively connected to the b end of the first four-way valve (2) and the exhaust heat exchanger (4); A third pipeline (L3), wherein both ends of the third pipeline (L3) are respectively connected to the exhaust heat exchanger (4) and the first throttle valve (5); a fourth pipeline (L4), wherein both ends of the fourth pipeline (L4) are respectively connected to the first throttle valve (5) and the second throttle valve (6); a fifth pipeline (L5), wherein both ends of the fifth pipeline (L5) are respectively connected to the second throttle valve (6) and the fresh air heat exchanger (7); a sixth pipeline (L6), wherein both ends of the sixth pipeline (L6) are respectively connected to the fresh air heat exchanger (7) and the d end of the first four-way valve (2); a seventh pipeline (L7), wherein both ends of the seventh pipeline (L7) are respectively connected to the C end of the first four-way valve (2) and one end of the compressor (1); an eighth pipeline (L8), wherein two ends of the eighth pipeline (L8) are respectively connected to the compressor (1) and one end of the first one-way valve (11); a ninth pipeline (L9), the two ends of the ninth pipeline (L9) being respectively connected to the h end of the second four-way valve (3) and the reheat heat exchanger (8); a tenth pipeline (L10), wherein both ends of the tenth pipeline (L10) are respectively connected to the e end of the second four-way valve (3) and the other end of the first one-way valve (11); an eleventh pipeline (L11), wherein both ends of the eleventh pipeline (L11) are respectively connected to the third throttle valve (9) and the reheat heat exchanger (8); a twelfth pipeline (L12), wherein both ends of the twelfth pipeline (L12) are respectively connected to the third throttle valve (9) and the air supply heat exchanger (10); a thirteenth pipeline (L13), wherein both ends of the thirteenth pipeline (L13) are respectively connected to the g end of the second four-way valve (3) and the air supply heat exchanger (10); A fourteenth pipeline (L14), the two ends of which are respectively connected to one end of the compressor (1) and the f end of the second four-way valve (3); a fifteenth pipeline (L15), wherein both ends of the fifteenth pipeline (L15) are respectively connected to one end of the second one-way valve (12) and one end of the first throttle valve (5); a first one-way valve (11), wherein a cut-off end of the first one-way valve (11) is connected to an exhaust port (101) of the compressor (1), and a pass end is connected to an end e of the second four-way valve (3); A second one-way valve (12), wherein the cut-off end of the second one-way valve (12) is connected to one end of the first throttle valve (5) and the second throttle valve (6), and the through end is connected to the e end of the third throttle valve (9).

3. The energy-saving primary return air air conditioning system based on heat pump heat recovery according to claim 1, characterized in that: The air circulation system also includes An exhaust regulating valve (13), the exhaust regulating valve (13) being arranged outside the exhaust heat exchanger (4), and the exhaust regulating valve (13) being used to control the return air from a portion of the air conditioner return air section to pass through the exhaust heat exchanger (4) for heat exchange; A return air regulating valve (14), the return air regulating valve (14) being arranged outside the exhaust air regulating valve (13), and the return air regulating valve (14) being used to control the return air from another part of the air conditioning cabinet return air section to pass to the air conditioning cabinet mixing section; A fresh air regulating valve (15), the fresh air regulating valve (15) being arranged outside the fresh air heat exchanger (7), the fresh air regulating valve (15) being used to control the fresh air at the fresh air section of the air conditioner to pass to the mixing section of the air conditioner; an exhaust fan (16), the exhaust fan (16) being arranged outside the exhaust heat exchanger (4), and the exhaust fan (16) being used to discharge part of the return air into the outdoor environment; a heat exchange coil (17), wherein the heat exchange coil (17) is arranged outside the return air regulating valve (14) and the fresh air regulating valve (15); a humidifier (18), the humidifier (18) being arranged outside the reheat heat exchanger (8); An air supply fan (19), wherein the air supply fan (19) is arranged outside the humidifier (18).

4. The energy-saving primary return air air conditioning system based on heat pump heat recovery according to claim 3, characterized in that: When the exhaust air heat exchanger (4) and the reheat heat exchanger (8) are condensers, the fresh air heat exchanger (7) and the supply air heat exchanger (10) are evaporators.

5. The energy-saving primary return air air conditioning system based on heat pump heat recovery according to claim 4, characterized in that: When the fresh air heat exchanger (7), the reheat heat exchanger (8), and the supply air heat exchanger (10) are condensers, the exhaust air heat exchanger (4) is an evaporator.

6. The energy-saving primary return air air conditioning system based on heat pump heat recovery according to claim 5, characterized in that: The first throttle valve (5), the second throttle valve (6), and the third throttle valve (9) are electromagnetic valves when they have a throttling effect.

7. The energy-saving primary return air air conditioning system based on heat pump heat recovery according to claim 6, characterized in that: The exhaust air heat exchanger (4), the fresh air heat exchanger (7), the reheat heat exchanger (8) and the supply air heat exchanger (10) can be external cold and heat source circulation coils for indirect heat exchange with the air or refrigerant circulation equipment for direct heat exchange with the air.

8. The energy-saving primary return air air conditioning system based on heat pump heat recovery according to claim 3, characterized in that: The exhaust fan (16) is a device inside the air conditioning cabinet or a fan in an external exhaust pipe; the supply fan (19) is a device inside the air conditioning cabinet or a fan in an external supply pipe.

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