Energy-saving primary air return air conditioning system based on combined cooling and heating water supply loop heat pump

Abstract

The utility model discloses an energy-saving primary air return air conditioning system based on a cold and heat combined water supply loop heat pump, which is characterized in that water circulation comprises a four-pipe water loop heat pump unit, a reheating heat exchanger, a first control valve, a heat exchange coil, an air supply heat exchanger, a second control valve, a fresh air heat exchanger, a third control valve, an air supply heat exchanger and a fourth control valve; 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 humidifier and an air supply fan. The air-conditioning system has the advantages that cooling capacity in exhaust air can be recycled in summer to remove heat and humidity of fresh air and supplied air, heat in the fresh air and heat in the supplied air are recycled to conduct secondary heating on the supplied air, the requirement for the cooling capacity of supplied air is reduced, and meanwhile energy loss caused by cold and heat offset of a conventional primary air return air-conditioning system is reduced; fresh air and supplied air are subjected to air cooling heat treatment while cold and heat of exhaust air are recycled, supplied air is subjected to secondary heating, the air treatment process of the primary air return air conditioning system is optimized, and energy consumption of a conventional primary air return air conditioning system is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust full heat recovery air conditioning, in particular to an energy-saving primary return air conditioning system based on a cold and hot supply water ring heat pump. Background Art

[0002] Air conditioning consumes enormous amounts of energy in buildings, accounting for 50% to 70% of total energy consumption. Therefore, energy-saving measures for building air conditioning systems are crucial. This proportion of energy consumption remains high. Traditional central air conditioning systems combine outdoor fresh air with indoor return air, centrally treating its heat and moisture before distributing it to the building to alleviate internal loads. Fresh air, as a component of the air conditioning load, typically accounts for 30% to 50% of the total, exceeding 60% in winter and even exceeding 70% in densely populated public buildings. Exhaust heat recovery devices in air conditioning systems can recycle and utilize the heat and cold contained in exhaust air, pre-treating the fresh air and thus reducing the energy consumption associated with processing it. Research has shown that when a heat recovery device achieves a 70% heat recovery efficiency, it can effectively reduce heating energy consumption by 40% to 50%.

[0003] The most widely used air-conditioning system at present is the single-return air system. The single-return air-conditioning system is an air-conditioning system that fully mixes the indoor return air and the outdoor fresh air during the centralized air processing process. The mixed air is then cooled by the surface cooler and then directly sent into the air-conditioned room or sent into the air-conditioned room after heating.

[0004] To remove water vapor from the air under cooling conditions, the evaporation temperature of the refrigerant in traditional central air conditioning systems needs to be significantly lower than the dew point of the air. This increases the temperature difference between the evaporation and condensation temperatures of the refrigeration unit, and the lower evaporation temperature reduces the refrigerant unit's coefficient of performance to a certain extent. Furthermore, under dew-point air supply conditions, indoor temperature and humidity parameters may deviate from the design operating point, and reheated air supply consumes additional energy. Furthermore, the simultaneous coupled treatment of air temperature and humidity during surface cooling does not truly maximize the energy efficiency of the cooling source, hindering subsequent operational control. In a single-return air handling unit, the mixed air is cooled and dehumidified in the surface cooler before being reheated in the reheater. This cooling followed by reheating process is known as "cold and heat offset," resulting in significant energy waste.

[0005] The secondary return air system, developed to address this drawback of the primary return air system, reduces the extra energy required by the reheater, but does so at the expense of a lower dew point. This reduces refrigeration system efficiency and further limits the use of natural cooling sources. Furthermore, the secondary return air system's poor resistance to moisture disturbances and inconvenient adjustment and control also restrict its use.

[0006] Traditional central air-conditioning systems have numerous loops and are complex. The energy consumption during energy transmission in each loop is huge, almost equivalent to the energy consumption of the cold and heat sources, resulting in a significant reduction in the performance coefficient of the entire air-conditioning system.

[0007] Therefore, in order to solve the above problems, it is necessary to propose an energy-saving primary return air air conditioning system based on a combined cooling and heating water loop heat pump. Utility Model Content

[0008] The purpose of the utility model is to provide an energy-saving primary return air air conditioning system based on a cold and hot supply water ring heat pump to solve the above technical problems.

[0009] To achieve the above objectives, the present invention provides the following technical solutions:

[0010] An energy-saving single-return air conditioning system based on a combined cooling and heating water-loop heat pump comprises a water circulation system and an air circulation system. The water circulation system comprises a four-pipe water-loop heat pump unit, a reheat heat exchanger, a first control valve, a heat exchange coil, a supply air heat exchanger, a second control valve, a fresh air heat exchanger, a third control valve, an exhaust air heat exchanger, and a fourth control valve.

[0011] The air circulation system includes exhaust air regulating valve, return air regulating valve, fresh air regulating valve, exhaust fan, humidifier and supply air fan;

[0012] The first pipe leading out of the cold water supply pipe of the four-pipe water ring heat pump unit is connected to one end of the third cold water supply pipe control valve; the second pipe leading out of the other end of the third cold water supply pipe control valve is connected to one end of the exhaust heat exchanger;

[0013] A third pipe extending from the other end of the exhaust heat exchanger is connected to one end of a fourth control valve; a fourth pipe extending from the other end of the fourth control valve is connected to one end of a third cold water return pipe control valve; a fifth pipe extending from the other end of the third cold water return pipe control valve is connected to the cold water return pipe port of the four-pipe water-loop heat pump unit; a sixth pipe branched from the first pipe is connected to one end of a second cold water supply pipe control valve; a seventh pipe extending from the other end of the second cold water supply pipe control valve is connected to one end of the fresh air heat exchanger;

[0014] The eighth pipe led out from the other end of the fresh air heat exchanger is connected to one end of the third control valve; the ninth pipe led out from the other end of the third control valve is connected to one end of the second cold water return pipe control valve; the tenth pipe led out from the other end of the second cold water return pipe control valve is connected to the fifth pipe; the eleventh pipe branched out from the first pipe is connected to one end of the first cold water supply pipe control valve; the twelfth pipe led out from the other end of the first cold water supply pipe control valve is connected to one end of the supply air heat exchanger; the thirteenth pipe led out from the other end of the supply air heat exchanger is connected to one end of the second control valve; the fourteenth pipe led out from the other end of the second control valve is connected to one end of the first cold water return pipe control valve; the fifteenth pipe led out from the other end of the first cold water return pipe control valve is connected to the fifth pipe; the sixteenth pipe led out from the cold water supply pipe outlet of the four-pipe water ring heat pump unit is connected to one end of the reheat heat exchanger;

[0015] The seventeenth pipe led out from the other end of the reheat heat exchanger is connected to one end of the first control valve; the eighteenth pipe led out from the other end of the first control valve is connected to the hot water return pipe of the four-pipe water ring heat pump unit; the nineteenth pipe branched from the sixteenth pipe is connected to one end of the first cold water supply pipe control valve; the twentieth pipe led out from the other end of the first cold water supply pipe control valve is connected to the twelfth pipe; the twenty-first pipe branched from the fourteenth pipe is connected to one end of the first hot water return pipe control valve; the twenty-second pipe led out from the other end of the first hot water return pipe control valve is connected to the eighteenth pipe; the twenty-third pipe branched from the nineteenth pipe is connected to the second cold water supply pipe control valve one end of the second cold water supply pipe control valve; the twenty-fourth pipe derived from the other end of the second cold water supply pipe control valve is connected to the seventh pipe; the twenty-fifth pipe branched from the eighth pipe is connected to one end of the second hot water return pipe control valve; the twenty-sixth pipe derived from the other end of the second hot water return pipe control valve is connected to the twenty-second pipe; the twenty-seventh pipe branched from the twenty-third pipe is connected to one end of the third hot water supply pipe control valve; the twenty-eighth pipe derived from the other end of the control valve is connected to the second pipe; the twenty-ninth pipe branched from the fourth pipe is connected to one end of the third hot water return pipe control valve; the 30th pipe derived from the other end of the third hot water return pipe control valve is connected to the twenty-sixth pipe.

[0016] After the return air in the air-conditioned room enters through the return air outlet of the air-conditioning cabinet, part of it enters the exhaust duct through the exhaust regulating valve, exchanges heat with the exhaust heat exchanger, and is then discharged to the outdoor environment by the exhaust fan; the other part enters the mixing section of the air-conditioning cabinet through the return air regulating valve and is mixed with the fresh air entering through the fresh air regulating valve. 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; the mixed air passes through the supply air heat exchanger, heat exchange coil, reheat heat exchanger, and humidifier to complete heat and humidity treatment in sequence, and is then sent into the air-conditioned room through the supply air fan.

[0017] Preferably, when the exhaust air heat exchanger and the reheat heat exchanger are hot coils, the fresh air heat exchanger and the supply air heat exchanger are cold coils.

[0018] Preferably, when the fresh air heat exchanger, the reheat heat exchanger and the supply air heat exchanger are hot coils, the exhaust air heat exchanger is a cold coil.

[0019] Preferably, the first control valve, the second control valve, the third control valve and the fourth control valve all control the flow of fluid and are electric valves, solenoid valves or temperature control valves, preferably solenoid valves.

[0020] Preferably, the first cold water supply pipe control valve, the first cold water return pipe control valve, the first hot water supply pipe control valve, the first hot water return pipe control valve, the second cold water supply pipe control valve, the second cold water return pipe control valve, the second hot water supply pipe control valve, the second hot water return pipe control valve, the third cold water supply pipe control valve, the third cold water return pipe control valve, the third hot water supply pipe control valve, and the third hot water return pipe control valve are all manual control valves, electric control valves or electromagnetic control valves, preferably solenoid valves.

[0021] Preferably, the exhaust fan can be an equipment inside the air-conditioning cabinet, or it can be a fan of the exhaust external duct; the supply air fan can be an equipment inside the air-conditioning cabinet, or it can be a fan of the supply air external duct; under winter working conditions, the heat exchange coil can exist as a heat source, or it can not exist as a heat source; the humidifier can be located after the reheat heat exchanger, or it can be located in other positions of the air-conditioning cabinet according to different humidification methods such as isothermal and isenthalpic; the reheat heat exchanger, supply air heat exchanger, fresh air heat exchanger, exhaust air heat exchanger and other heat exchange devices can be used separately, partially, or all at the same time according to the actual single return air air conditioning treatment needs, and preferably all at the same time.

[0022] The beneficial effects of the utility model are as follows: the water cycle includes a four-pipe water-loop heat pump unit, a reheat heat exchanger, a first control valve, a heat exchange coil, a supply air heat exchanger, a second control valve, a fresh air heat exchanger, a third control valve, a supply air heat exchanger, and a fourth control valve; the air cycle includes an exhaust regulating valve, a return air regulating valve, a fresh air regulating valve, an exhaust fan, a humidifier, and a supply air fan; the system is an energy-saving single-return air air-conditioning system based on a cold and hot combined water-loop heat pump, which can meet the needs of exhaust air heat recovery, fresh air heat treatment, supply air heat treatment, and supply air secondary heating under various working conditions; in summer, the cold energy in the exhaust air can be recovered to remove heat and humidify the fresh air and supply air, and the new air can be recovered. The heat in the exhaust air and the supply air is used to heat the supply air twice, which reduces the demand for supply air cooling and the energy loss caused by the heat and cold offset of the conventional single-return air air-conditioning system. In winter, the heat in the exhaust air can be recovered to heat the fresh air and the supply air. The system can recover the heat of the exhaust air while performing heat treatment on the fresh air and supply air, and heating the supply air twice, under winter and summer working conditions, avoiding the energy consumption of electric heating in the conventional single-return air-conditioning system. The heat recovery amount is well adjustable, which well optimizes the air treatment process of the conventional single-return air-conditioning system and greatly reduces the energy consumption of the conventional single-return air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the air conditioning system principle of the present utility model.

[0024] Reference numerals in the figure: 1, four-pipe water-loop heat pump unit; LG, cold water supply pipe outlet of the four-pipe water-loop heat pump unit; LH, cold water return pipe outlet of the four-pipe water-loop heat pump unit; RG, hot water supply pipe outlet of the four-pipe water-loop heat pump unit; RH, hot water return pipe outlet of the four-pipe water-loop heat pump unit; 2, reheat heat exchanger; 3, first control valve; 4, heat exchange coil; 5, supply air heat exchanger, 6, second control valve; 7, exhaust air heat exchanger; 8, third control valve; 9, exhaust air heat exchanger, 10, fourth control valve;

[0025] LG, cold water supply pipe; RG, hot water supply pipe; RH, hot water return pipe

[0026] LG5, first cold water supply pipe control valve; LH5, first cold water return pipe control valve; RG5, first hot water supply pipe control valve; RH5, first hot water return pipe control valve;

[0027] LG7, second cold water supply pipe control valve; LH7, second cold water return pipe control valve; RG7, second hot water supply pipe control valve; RH7, second hot water return pipe control valve;

[0028] LG9, third cold water supply pipe control valve; LH9, third cold water return pipe control valve; RG9, third hot water supply pipe control valve; RH9, third hot water return pipe control valve;

[0029] F1, exhaust regulating valve; F2, return air regulating valve; F3, fresh air regulating valve; F4, exhaust fan; F5, humidifier; F6, supply air fan.

[0030] 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; L16, sixteenth pipeline; L17, The seventeenth pipeline; L18, the eighteenth pipeline; L19, the nineteenth pipeline; L20, the twentieth pipeline; L21, the twenty-first pipeline; L22, the twenty-second pipeline; L23, the twenty-third pipeline; L24, the twenty-fourth pipeline; L25, the twenty-fifth pipeline; L26, the twenty-sixth pipeline; L27, the twenty-seventh pipeline; L28, the twenty-eighth pipeline; L29, the twenty-ninth pipeline; L30, the thirtieth pipeline. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The following is combined with Figure 1 The embodiments of the present invention are described in further detail.

[0033] like Figure 1 As shown, this embodiment provides a technical solution: an energy-saving primary return air air conditioning system based on a combined cooling and heating water ring heat pump, including a water circulation system and an air circulation system, wherein the water circulation system includes a four-pipe water ring heat pump unit 1, a reheat heat exchanger 2, a first control valve 3, a heat exchange coil 4, a supply air heat exchanger 5, a second control valve 6, a fresh air heat exchanger 7, a third control valve 8, an exhaust air heat exchanger 9, and a fourth control valve 10;

[0034] The air circulation system includes exhaust air regulating valve F1, return air regulating valve F2, fresh air regulating valve F3, exhaust fan F4, humidifier F5, and supply air fan F6;

[0035] The first pipe L1 led out of the cold water supply pipe port LG of the four-pipe water ring heat pump unit 1 is connected to one end of the third cold water supply pipe control valve LG9; the second pipe L2 led out of the other end of the third cold water supply pipe control valve LG9 is connected to one end of the exhaust heat exchanger 9;

[0036] A third pipe L3 extending from the other end of the exhaust heat exchanger 9 is connected to one end of a fourth control valve 10; a fourth pipe L4 extending from the other end of the fourth control valve 10 is connected to one end of a third cold water return pipe control valve LH9; a fifth pipe L5 extending from the other end of the third cold water return pipe control valve LH9 is connected to the cold water return pipe port LH of the four-pipe water ring heat pump unit 1; a sixth pipe L6 branching from the first pipe L1 is connected to one end of a second cold water supply pipe control valve LG7; a seventh pipe L7 extending from the other end of the second cold water supply pipe control valve LG7 is connected to one end of the fresh air heat exchanger 7;

[0037] The eighth pipeline L8 led out from the other end of the fresh air heat exchanger 7 is connected to one end of the third control valve 8; the ninth pipeline L9 led out from the other end of the third control valve 8 is connected to one end of the second cold water return pipe control valve LH7; the tenth pipeline L10 led out from the other end of the second cold water return pipe control valve LH7 is connected to the fifth pipeline L5; the eleventh pipeline L11 branched from the first pipeline L1 is connected to one end of the first cold water supply pipe control valve LG5; the twelfth pipeline L10 led out from the other end of the first cold water supply pipe control valve LG5 is connected to one end of the first cold water supply pipe control valve LG5. L12 is connected to one end of the air supply heat exchanger 5; a thirteenth pipe L13 led from the other end of the air supply heat exchanger 5 is connected to one end of the second control valve 6; a fourteenth pipe L14 led from the other end of the second control valve 6 is connected to one end of the first cold water return pipe control valve LH5; a fifteenth pipe L15 led from the other end of the first cold water return pipe control valve LH5 is connected to the fifth pipe L5; a sixteenth pipe L16 led from the cold water supply pipe port LG of the four-pipe water ring heat pump unit 1 is connected to one end of the reheat heat exchanger 2;

[0038] The seventeenth pipeline L17 led out from the other end of the reheat heat exchanger 2 is connected to one end of the first control valve 3; the eighteenth pipeline L18 led out from the other end of the first control valve 3 is connected to the hot water return pipe RH of the four-pipe water ring heat pump unit 1; the nineteenth pipeline L19 branched off from the sixteenth pipeline L16 is connected to one end of the first cold water supply pipe control valve LG5; the twentieth pipeline L20 led out from the other end of the first cold water supply pipe control valve LG5 is connected to the twelfth pipeline L12; the twenty-first pipeline L21 branched off from the fourteenth pipeline L14 is connected to one end of the first hot water return pipe control valve RH5; the twenty-second pipeline L22 led out from the other end of the first hot water return pipe control valve RH5 is connected to the eighteenth pipeline L18; the twenty-third pipeline L23 branched off from the nineteenth pipeline L19 is connected to the second cold water supply pipe control valve RG7 one end; the twenty-fourth pipeline L24 led out from the other end of the second cold water supply pipe control valve LG7 is connected to the seventh pipeline L7; the twenty-fifth pipeline L25 branched off from the eighth pipeline L8 is connected to one end of the second hot water return pipe control valve RH7; the twenty-sixth pipeline L26 led out from the other end of the second hot water return pipe control valve RH7 is connected to the twenty-second pipeline L22; the twenty-seventh pipeline L27 branched off from the twenty-third pipeline L23 is connected to one end of the third hot water supply pipe control valve RG9; the twenty-eighth pipeline L28 led out from the other end of the control valve RG9 is connected to the second pipeline L2; the twenty-ninth pipeline L29 branched off from the fourth pipeline L4 is connected to one end of the third hot water return pipe control valve RH9; the thirtieth pipeline L30 led out from the other end of the third hot water return pipe control valve RH9 is connected to the twenty-sixth pipeline L26.

[0039] After the return air in the air-conditioned room enters through the return air outlet of the air-conditioning cabinet, part of it enters the exhaust duct through the exhaust regulating valve F1, exchanges heat with the exhaust heat exchanger 9, and is then discharged to the outdoor environment by the exhaust fan F4; the other part enters the mixing section of the air-conditioning cabinet through the return air regulating valve F2 and mixes with the fresh air entering through the fresh air regulating valve F3. 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 7; the mixed air passes through the supply air heat exchanger 5, the heat exchange coil 4, the reheat heat exchanger 2, and the humidifier F5 to complete heat and humidity treatment in sequence, and is then sent into the air-conditioned room through the supply air fan F6.

[0040] Preferably, when the exhaust air heat exchanger 9 and the reheat heat exchanger 2 are hot coils, the fresh air heat exchanger 7 and the supply air heat exchanger 5 are cold coils.

[0041] Preferably, when the fresh air heat exchanger 7, the reheat heat exchanger 2, and the supply air heat exchanger 5 are hot coils, the exhaust air heat exchanger 9 is a cold coil.

[0042] Preferably, the first control valve 3, the second control valve 6, the third control valve 8, and the fourth control valve 10 all control the flow of fluid, and are all electric valves, solenoid valves, or temperature control valves, preferably solenoid valves.

[0043] Preferably, the first cold water supply pipe control valve LG5, the first cold water return pipe control valve LH5, the first hot water supply pipe control valve RG5, the first hot water return pipe control valve RH5, the second cold water supply pipe control valve LG7, the second cold water return pipe control valve LH7, the second hot water supply pipe control valve RG7, the second hot water return pipe control valve RH7, the third cold water supply pipe control valve LG9, the third cold water return pipe control valve LH9, the third hot water supply pipe control valve RG9, and the third hot water return pipe control valve RH9 are all manual control valves, electric control valves or electromagnetic control valves, preferably solenoid valves.

[0044] Preferably, the exhaust fan F4 can be an internal device of the air conditioning cabinet, or it can be a fan of the exhaust external duct; the supply air fan F6 can be an internal device of the air conditioning cabinet, or it can be a fan of the supply external duct; under winter working conditions, the heat exchange coil 4 can exist as a heat source, or it can not exist as a heat source; the humidifier F5 can be located after the reheat heat exchanger 8, or it can be located at other positions of the air conditioning cabinet according to different humidification methods such as isothermal and isenthalpic; the reheat heat exchanger 2, the supply air heat exchanger 5, the fresh air heat exchanger 7, the exhaust air heat exchanger 9 and other heat exchange devices can be used separately, partially, or all at the same time according to the actual single return air air conditioning processing requirements, and preferably all at the same time.

[0045] The beneficial effects of the utility model are as follows: the water cycle includes a four-pipe water-loop heat pump unit 1, a reheat heat exchanger 2, a first control valve 3, a heat exchange coil 4, a supply air heat exchanger 5, a second control valve 6, a fresh air heat exchanger 7, a third control valve 8, a supply air heat exchanger 9, and a fourth control valve 10; the air cycle includes an exhaust regulating valve F1, a return air regulating valve F2, a fresh air regulating valve F3, an exhaust fan F4, a humidifier F5, and a supply air fan F6; the system is an energy-saving primary return air air-conditioning system based on a cold and hot combined water-loop heat pump, which can meet the needs of exhaust heat recovery, fresh air heat treatment, supply air heat treatment, and supply air secondary heating under various working conditions; in summer, the cooling capacity in the exhaust air can be recovered to treat the fresh air and supply air; The system removes heat and moisture from the exhaust air, recovers heat from the fresh air and supply air, and reheats the supply air, which reduces the demand for supply air cooling and the energy loss caused by the heat and cold offset of the conventional single-return air conditioning system. In winter, the heat in the exhaust air can be recovered to heat the fresh air and the supply air. The system can recover the heat of the exhaust air and treat the heat of the fresh air and supply air, and reheat the supply air in both winter and summer working conditions, thus avoiding the energy consumption of electric heating in the conventional single-return air conditioning system. The heat recovery amount is highly adjustable, which greatly optimizes the air treatment process of the conventional single-return air conditioning system and greatly reduces the energy consumption of the conventional single-return air conditioning system.

[0046] Preferably, the four-pipe water ring heat pump unit 1 in the present invention has integrated the circulating water pump, water replenishment device and other auxiliary equipment into the unit module, and can also be deployed separately according to actual needs.

[0047] Use Example 1

[0048] In summer, the energy-saving single-return air conditioning system based on the combined cooling and heating water-loop heat pump of the present invention is used as a summer refrigeration cycle to realize the operation mode of only recovering the exhaust cooling energy and treating the fresh air:

[0049] The water circulation of the system is as follows: the first control valve 3 is closed, the second throttle valve 6 is closed, the third control valve 8 is opened, and the fourth control valve 10 is opened. The cold water flowing out of the evaporator water supply port of the four-pipe water ring heat pump unit 1 absorbs heat in the fresh air heat exchanger 7, and the cold water with temperature rise flows through the third control valve 8 and returns to the evaporator return water port of the four-pipe water ring heat pump unit 1; the hot water flowing out of the condenser water supply port of the four-pipe water ring heat pump unit 1 releases heat in the exhaust air heat exchanger 9, and the hot water with temperature drop flows through the fourth control valve 10 and returns to the condenser return water port of the four-pipe water ring heat pump unit 1.

[0050] The air circulation of this system is as follows: after the return air in the air-conditioned room enters through the return air inlet of the air-conditioning cabinet, a part of it enters the exhaust duct through the exhaust air regulating valve F1, exchanges heat with the exhaust air heat exchanger 9, and is then discharged to the outdoor environment by the exhaust fan F4; the other part enters the mixing section of the air-conditioning cabinet through the return air regulating valve F2 and is mixed with the fresh air entering through the fresh air regulating valve F3. Before entering the mixing section of the air-conditioning cabinet, the fresh air first enters through the fresh air inlet of the air-conditioning cabinet and completes heat exchange with the fresh air heat exchanger 7; the mixed air passes through the supply air heat exchanger 5, the heat exchange coil 4, the reheat heat exchanger 2, and the humidifier F5 to complete heat and humidity treatment in sequence, and is then sent into the air-conditioned room through the supply air fan F6.

[0051] Use Example 2

[0052] In summer, the energy-saving single-return air conditioning system based on the combined cooling and heating water-loop heat pump of the utility model is used as a summer refrigeration cycle to realize heat extraction from the supply air and perform secondary heating on the supply air:

[0053] The water circulation of the system is as follows: the first control valve 3 is opened, the second throttle valve 6 is opened, the third control valve 8 is closed, and the fourth control valve 10 is closed. The cold water flowing out of the evaporator water supply port of the four-pipe water ring heat pump unit 1 absorbs heat in the air supply heat exchanger 5, and the cold water with temperature rise flows through the second control valve 6 and returns to the evaporator return water port of the four-pipe water ring heat pump unit 1; the hot water flowing out of the condenser water supply port of the four-pipe water ring heat pump unit 1 releases heat in the reheat heat exchanger 2, and the hot water with temperature drop flows through the first control valve 3 and returns to the condenser return water port of the four-pipe water ring heat pump unit 1.

[0054] The air circulation of this system is as follows: after the return air in the air-conditioned room enters through the return air inlet of the air-conditioning cabinet, a part of it enters the exhaust duct through the exhaust air regulating valve F1, exchanges heat with the exhaust air heat exchanger 9, and is then discharged to the outdoor environment by the exhaust fan F4; the other part enters the mixing section of the air-conditioning cabinet through the return air regulating valve F2 and is mixed with the fresh air entering through the fresh air regulating valve F3. Before entering the mixing section of the air-conditioning cabinet, the fresh air first enters through the fresh air inlet of the air-conditioning cabinet and completes heat exchange with the fresh air heat exchanger 7; the mixed air passes through the supply air heat exchanger 5, the heat exchange coil 4, the reheat heat exchanger 2, and the humidifier F5 to complete heat and humidity treatment in sequence, and is then sent into the air-conditioned room through the supply air fan F6.

[0055] Use Example 3

[0056] In summer, the energy-saving single-return air conditioning system based on the combined cooling and heating water-loop heat pump of the present invention is used as a summer refrigeration cycle to simultaneously recover exhaust air cooling, recover fresh air heat, and extract heat from supply air, thereby performing secondary heating on the supply air.

[0057] The water circulation of the system is as follows: the first control valve 3 is opened, the second throttle valve 6 is opened, the third control valve 8 is opened, and the fourth control valve 10 is opened. The cold water flowing out of the evaporator water supply port of the four-pipe water ring heat pump unit 1 absorbs heat in the supply air heat exchanger 5 and the fresh air heat exchanger 7. The cold water after temperature rise flows through the second control valve 6 and the third control valve 8 and then returns to the evaporator return water port of the four-pipe water ring heat pump unit 1; the hot water flowing out of the condenser water supply port of the four-pipe water ring heat pump unit 1 releases heat in the reheat heat exchanger 2 and the exhaust air heat exchanger 9. The hot water after temperature drop flows through the first control valve 3 and the fourth control valve 10 and then returns to the condenser return water port of the four-pipe water ring heat pump unit 1.

[0058] The air circulation of this system is as follows: after the return air in the air-conditioned room enters through the return air inlet of the air-conditioning cabinet, a part of it enters the exhaust duct through the exhaust air regulating valve F1, exchanges heat with the exhaust air heat exchanger 9, and is then discharged to the outdoor environment by the exhaust fan F4; the other part enters the mixing section of the air-conditioning cabinet through the return air regulating valve F2 and is mixed with the fresh air entering through the fresh air regulating valve F3. Before entering the mixing section of the air-conditioning cabinet, the fresh air first enters through the fresh air inlet of the air-conditioning cabinet and completes heat exchange with the fresh air heat exchanger 7; the mixed air passes through the supply air heat exchanger 5, the heat exchange coil 4, the reheat heat exchanger 2, and the humidifier F5 to complete heat and humidity treatment in sequence, and is then sent into the air-conditioned room through the supply air fan F6.

[0059] Use Example 4

[0060] Under winter conditions, the utility model is an energy-saving single-return air conditioning system based on a combined cooling and heating water-loop heat pump as a winter heating cycle to achieve only exhaust heat recovery to heat the fresh air condition:

[0061] The water circulation of the system is as follows: the first control valve 3 is closed, the second throttle valve 6 is closed, the third control valve 8 is opened, and the fourth control valve 10 is opened. The cold water flowing out of the water supply port of the evaporator of the four-pipe water ring heat pump unit 1 absorbs heat in the exhaust heat exchanger 9, and the cold water with temperature rise flows through the fourth control valve 10 and returns to the evaporator return port of the four-pipe water ring heat pump unit 1; the hot water flowing out of the water supply port of the condenser of the four-pipe water ring heat pump unit 1 releases heat in the fresh air heat exchanger 7, and the hot water with temperature drop flows through the third control valve 8 and returns to the condenser return port of the four-pipe water ring heat pump unit 1.

[0062] The air circulation of this system is as follows: after the return air in the air-conditioned room enters through the return air inlet of the air-conditioning cabinet, a part of it enters the exhaust duct through the exhaust air regulating valve F1, exchanges heat with the exhaust air heat exchanger 9, and is then discharged to the outdoor environment by the exhaust fan F4; the other part enters the mixing section of the air-conditioning cabinet through the return air regulating valve F2 and is mixed with the fresh air entering through the fresh air regulating valve F3. Before entering the mixing section of the air-conditioning cabinet, the fresh air first enters through the fresh air inlet of the air-conditioning cabinet and completes heat exchange with the fresh air heat exchanger 7; the mixed air passes through the supply air heat exchanger 5, the heat exchange coil 4, the reheat heat exchanger 2, and the humidifier F5 to complete heat and humidity treatment in sequence, and is then sent into the air-conditioned room through the supply air fan F6.

[0063] Use Example 5

[0064] Under winter conditions, this utility model's energy-saving single-return air conditioning system based on a combined cooling and heating water-loop heat pump serves as a winter heating cycle to simultaneously recover exhaust heat, heat fresh air, and heat supply air, without secondary heating of the supply air:

[0065] The water circulation of the system is as follows: the first control valve 3 is closed, the second throttle valve 6 is opened, the third control valve 8 is opened, and the fourth control valve 10 is opened. The cold water flowing out of the evaporator water supply port of the four-pipe water ring heat pump unit 1 absorbs heat in the exhaust heat exchanger 9, and the cold water after temperature rise flows through the fourth control valve 10 and returns to the evaporator return water port of the four-pipe water ring heat pump unit 1; the hot water flowing out of the condenser water supply port of the four-pipe water ring heat pump unit 1 releases heat in the supply air heat exchanger 5 and the fresh air heat exchanger 7, and the hot water after temperature drop flows through the third control valve 8 and the second control valve 6 and returns to the condenser return water port of the four-pipe water ring heat pump unit 1.

[0066] The air circulation of this system is as follows: after the return air in the air-conditioned room enters through the return air inlet of the air-conditioning cabinet, a part of it enters the exhaust duct through the exhaust air regulating valve F1, exchanges heat with the exhaust air heat exchanger 9, and is then discharged to the outdoor environment by the exhaust fan F4; the other part enters the mixing section of the air-conditioning cabinet through the return air regulating valve F2 and is mixed with the fresh air entering through the fresh air regulating valve F3. Before entering the mixing section of the air-conditioning cabinet, the fresh air first enters through the fresh air inlet of the air-conditioning cabinet and completes heat exchange with the fresh air heat exchanger 7; the mixed air passes through the supply air heat exchanger 5, the heat exchange coil 4, the reheat heat exchanger 2, and the humidifier F5 to complete heat and humidity treatment in sequence, and is then sent into the air-conditioned room through the supply air fan F6.

[0067] Use Example 6

[0068] Under winter conditions, this utility model uses an energy-saving single-return air conditioning system based on a combined cooling and heating water-loop heat pump as a winter heating cycle to simultaneously recover exhaust heat, heat fresh air, and not heat the supply air, thereby performing secondary heating on the supply air:

[0069] The water circulation of the system is: the first control valve 3 is opened, the second throttling valve 6 is closed, the third control valve 8 is opened, and the fourth control valve 10 is opened, the cold water flowing out of the water supply port of the evaporator of the four-pipe water loop heat pump unit 1 absorbs heat in the exhaust heat exchanger 9, the temperature of the cold water is raised, and the cold water flows through the fourth control valve 10 and returns to the water return port of the evaporator of the four-pipe water loop heat pump unit 1; the hot water flowing out of the water supply port of the condenser of the four-pipe water loop heat pump unit 1 releases heat in the reheating heat exchanger 2 and the fresh air heat exchanger 7, and the temperature of the hot water is lowered, and the hot water flows through the third control valve 8 and the first control valve 3 and returns to the water return port of the condenser of the four-pipe water loop heat pump unit 1.

[0070] The air circulation of the system is: the return air in the air-conditioned room enters through the return air inlet of the air conditioner air cabinet, part of the return air enters the exhaust air passage and exchanges heat with the exhaust heat exchanger 9 through the exhaust air regulating valve F1, and is discharged to the outdoor environment by the exhaust air fan F4; the other part of the return air enters the air conditioner air cabinet mixing section and mixes with the fresh air entering through the fresh air regulating valve F3, and the fresh air enters the air conditioner air cabinet mixing section through the fresh air inlet and exchanges heat with the fresh air heat exchanger 7 before entering the air conditioner air cabinet mixing section; after mixing, the air completes heat and humidity treatment in sequence through the supply air heat exchanger 5, the heat exchange coil 4, the reheating heat exchanger 2 and the humidifier F5, and is sent into the air-conditioned room through the supply air fan F6.

[0071] Use example 7

[0072] In winter working condition, the energy-saving primary return air conditioner system based on the cold and heat combined water loop heat pump of the utility model realizes the simultaneous exhaust air heat recovery, fresh air heating and supply air heating, and performs secondary heating on the supply air:

[0073] The water circulation of the system is: the first control valve 3 is opened, the second throttling valve 6 is opened, the third control valve 8 is opened, and the fourth control valve 10 is opened, the cold water flowing out of the water supply port of the evaporator of the four-pipe water loop heat pump unit 1 absorbs heat in the exhaust heat exchanger 9, the temperature of the cold water is raised, and the cold water flows through the fourth control valve 10 and returns to the water return port of the evaporator of the four-pipe water loop heat pump unit 1; the hot water flowing out of the water supply port of the condenser of the four-pipe water loop heat pump unit 1 releases heat in the reheating heat exchanger 2, the supply air heat exchanger 5 and the fresh air heat exchanger 7, and the temperature of the hot water is lowered, and the hot water flows through the third control valve 8, the second control valve 6 and the first control valve 3 and returns to the water return port of the condenser of the four-pipe water loop heat pump unit 1.

[0074] The air circulation of this system is as follows: after the return air in the air-conditioned room enters through the return air inlet of the air-conditioning cabinet, a part of it enters the exhaust duct through the exhaust air regulating valve F1, exchanges heat with the exhaust air heat exchanger 9, and is then discharged to the outdoor environment by the exhaust fan F4; the other part enters the mixing section of the air-conditioning cabinet through the return air regulating valve F2 and is mixed with the fresh air entering through the fresh air regulating valve F3. Before entering the mixing section of the air-conditioning cabinet, the fresh air first enters through the fresh air inlet of the air-conditioning cabinet and completes heat exchange with the fresh air heat exchanger 7; the mixed air passes through the supply air heat exchanger 5, the heat exchange coil 4, the reheat heat exchanger 2, and the humidifier F5 to complete heat and humidity treatment in sequence, and is then sent into the air-conditioned room through the supply air fan F6.

[0075] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. An energy-saving primary return air conditioning system based on a combined cooling and heating water-loop heat pump, comprising a water circulation system and an air circulation system, characterized in that: The water circulation system comprises a four-pipe water ring heat pump unit (1), a reheat heat exchanger (2), a first control valve (3), a heat exchange coil (4), a supply air heat exchanger (5), a second control valve (6), a fresh air heat exchanger (7), a third control valve (8), an exhaust air heat exchanger (9), and a fourth control valve (10); The air circulation system includes exhaust air regulating valve (F1), return air regulating valve (F2), fresh air regulating valve (F3), exhaust fan (F4), humidifier (F5), and supply air fan (F6); The first pipe (L1) led out from the cold water supply pipe outlet (LG) of the four-pipe water ring heat pump unit (1) is connected to one end of the third cold water supply pipe control valve (LG9); the second pipe (L2) led out from the other end of the third cold water supply pipe control valve (LG9) is connected to one end of the exhaust heat exchanger (9); the third pipe (L3) led out from the other end of the exhaust heat exchanger (9) is connected to one end of the fourth control valve (10); the fourth pipe (L4) led out from the other end of the fourth control valve (10) is connected to one end of the third cold water return pipe control valve (LH9); the fifth pipe (L5) led out from the other end of the third cold water return pipe control valve (LH9) is connected to the cold water return pipe outlet (LH9) of the four-pipe water ring heat pump unit (1). H); the sixth pipeline (L6) branched from the first pipeline (L1) is connected to one end of the second cold water supply pipe control valve (LG7); the seventh pipeline (L7) led from the other end of the second cold water supply pipe control valve (LG7) is connected to one end of the fresh air heat exchanger (7); the eighth pipeline (L8) led from the other end of the fresh air heat exchanger (7) is connected to one end of the third control valve (8); the ninth pipeline (L9) led from the other end of the third control valve (8) is connected to one end of the second cold water return pipe control valve (LH7); the tenth pipeline (L10) led from the other end of the second cold water return pipe control valve (LH7) is connected to the fifth pipeline (L5); the eleventh pipeline (L11) branched from the first pipeline (L1) is connected to the The first cold water supply pipe is connected to one end of the control valve (LG5); the twelfth pipe (L12) led out from the other end of the first cold water supply pipe control valve (LG5) is connected to one end of the air supply heat exchanger (5); the thirteenth pipe (L13) led out from the other end of the air supply heat exchanger (5) is connected to one end of the second control valve (6); the fourteenth pipe (L14) led out from the other end of the second control valve (6) is connected to one end of the first cold water return pipe control valve (LH5); the fifteenth pipe (L15) led out from the other end of the first cold water return pipe control valve (LH5) is connected to the fifth pipe (L5); the sixteenth pipe (L16) led out from the cold water supply pipe port (LG) of the four-pipe water ring heat pump unit (1) is connected to the reheat exchanger (6). one end of the reheat heat exchanger (2); a seventeenth pipeline (L17) led out from the other end of the reheat heat exchanger (2) is connected to one end of the first control valve (3); an eighteenth pipeline (L18) led out from the other end of the first control valve (3) is connected to the hot water return pipe (RH) of the four-pipe water ring heat pump unit (1); a nineteenth pipeline (L19) branched from the sixteenth pipeline (L16) is connected to one end of the first cold water supply pipe control valve (LG5); a twentieth pipeline (L20) led out from the other end of the first cold water supply pipe control valve (LG5) is connected to the twelfth pipeline (L12); a twenty-first pipeline (L21) branched from the fourteenth pipeline (L14) is connected to one end of the first hot water return pipe control valve (RH5);The twenty-second pipe (L22) led out from the other end of the first hot water return pipe control valve (RH5) is connected to the eighteenth pipe (L18); the twenty-third pipe (L23) branched from the nineteenth pipe (L19) is connected to one end of the second cold water supply pipe control valve (LG7); the twenty-fourth pipe (L24) led out from the other end of the second cold water supply pipe control valve (LG7) is connected to the seventh pipe (L7); the twenty-fifth pipe (L25) branched from the eighth pipe (L8) is connected to one end of the second hot water return pipe control valve (RH7); the other end of the second hot water return pipe control valve (RH7) is led out The twenty-sixth pipeline (L26) is connected to the twenty-second pipeline (L22); the twenty-seventh pipeline (L27) branched from the twenty-third pipeline (L23) is connected to one end of the third hot water supply pipe control valve (RG9); the twenty-eighth pipeline (L28) led from the other end of the control valve (RG9) is connected to the second pipeline (L2); the twenty-ninth pipeline (L29) branched from the fourth pipeline (L4) is connected to one end of the third hot water return pipe control valve (RH9); the thirtieth pipeline (L30) led from the other end of the third hot water return pipe control valve (RH9) is connected to the twenty-sixth pipeline (L26).

2. The energy-saving primary return air conditioning system based on a combined cooling and heating water loop heat pump according to claim 1, characterized in that: 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 (F1) and exchanges heat with the exhaust heat exchanger (9), and is then discharged to the outdoor environment by the exhaust fan (F4); the other part enters the mixing section of the air-conditioning cabinet through the return air regulating valve (F2) and is mixed with the fresh air entering through the fresh air regulating valve (F3). 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 (7); the mixed air passes through the supply air heat exchanger (5), the heat exchange coil (4), the reheat heat exchanger (2), and the humidifier (F5) to complete heat and humidity treatment in sequence, and is then sent into the air-conditioned room through the supply air fan (F6).

3. The energy-saving primary return air air conditioning system based on a combined cooling and heating water loop heat pump according to claim 2, characterized in that: When the exhaust air heat exchanger (9) and the reheat heat exchanger (2) are hot coils, the fresh air heat exchanger (7) and the supply air heat exchanger (5) are cold coils.

4. The energy-saving primary return air conditioning system based on a combined cooling and heating water loop heat pump according to claim 3 is characterized in that: When the fresh air heat exchanger (7), the reheat heat exchanger (2), and the supply air heat exchanger (5) are hot coils, the exhaust air heat exchanger (9) is a cold coil.

5. The energy-saving primary return air conditioning system based on a combined cooling and heating water loop heat pump according to claim 4 is characterized in that: The first control valve (3), the second control valve (6), the third control valve (8), and the fourth control valve (10) all have the function of controlling the flow of fluid passing therethrough, and are all electric valves, solenoid valves, or temperature control valves.

6. The energy-saving primary return air conditioning system based on a combined cooling and heating water loop heat pump according to claim 5, characterized in that: The first cold water supply pipe control valve (LG5), the first cold water return pipe control valve (LH5), the first hot water supply pipe control valve (RG5), the first hot water return pipe control valve (RH5), the second cold water supply pipe control valve (LG7), the second cold water return pipe control valve (LH7), the second hot water supply pipe control valve (RG7), the second hot water return pipe control valve (RH7), the third cold water supply pipe control valve (LG9), the third cold water return pipe control valve (LH9), the third hot water supply pipe control valve (RG9), and the third hot water return pipe control valve (RH9) are all manual control valves, electric control valves, or solenoid control valves.

7. The energy-saving primary return air conditioning system based on a combined cooling and heating water loop heat pump according to claim 1, characterized in that: The exhaust fan (F4) can be a device inside the air conditioning cabinet, or it can be a fan for the exhaust external duct; the supply air fan (F6) can be a device inside the air conditioning cabinet, or it can be a fan for the supply external duct; under winter working conditions, the heat exchange coil (4) can exist as a heat source, or it can not exist as a heat source; the humidifier (F5) can be located after the reheat heat exchanger (2), or it can be located at other positions in the air conditioning cabinet according to different humidification methods; the reheat heat exchanger (2), the supply air heat exchanger (5), the fresh air heat exchanger (7), and the exhaust air heat exchanger (9) heat exchange devices can be used separately, partially, or all at the same time according to the actual primary return air air conditioning processing requirements.

Images