Energy-saving primary air return air conditioning system based on combined cooling and heating water supply loop heat pump
Through the energy-saving primary return air conditioning system based on the hot and cold water supply ring heat pump, the four-controlled water ring heat pump unit and heat exchanger are used to solve the problem of poor cold and heat offset and anti-humidity capabilities in traditional air conditioning systems, and realizes the realization of the problem of cold and heat offset and anti-humidity capabilities. Efficient hot and cold recovery and secondary heating reduce energy consumption.
Patent Information
- Application Number
- CN202411529132.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2024-12-13
AI Technical Summary
The traditional central air conditioning system has the ability to offset the heat and heat in the primary return air conditioning system, resulting in waste of energy, reduced efficiency of the refrigeration system, poor anti-humidity capability, inconvenient regulation and control, resulting in high energy consumption.
Adopt energy-saving primary return air conditioning system based on hot and cold water supply ring heat pump, including water circulation system and air circulation system, and use four-controlled water circulation heat pump unit, reheat heat exchanger, heat exchange coil, air supply heat exchanger and other components , realizes hot and cold recovery and secondary heating, and meets the air treatment needs under various working conditions.
It reduces the energy consumption of conventional primary return air conditioning systems, avoids the energy consumption of electric heating, optimizes the air treatment process, improves the adjustability of hot and cold recovery, and reduces the energy consumption loss caused by hot and cold offset.
Smart Images
Figure CN119123539A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of exhaust air full heat recovery air conditioning, and in particular to an energy-saving primary return air conditioning system based on a cold and hot combined supply water ring heat pump. Background Art
[0002] Air conditioning consumes a lot of energy in buildings, accounting for 50% to 70% of the total energy consumption. Therefore, it is very necessary to take energy-saving measures for the air conditioning system of the building. The proportion of air conditioning energy consumption in building energy consumption has always been high. The traditional central air conditioning system mixes outdoor fresh air and indoor return air for heat and humidity treatment, and then supplies air to the building to eliminate the load in the building. Among them, the fresh air load, as one of the components of the air conditioning load, generally accounts for 30% to 50% of the air conditioning load, and even exceeds 60% in winter, and even exceeds 70% in public buildings with a large population density. The use of exhaust heat recovery devices in the air conditioning system can recover and utilize the cold / heat contained in the exhaust air, pre-treat the fresh air, and thus reduce the energy consumption generated by processing the fresh air. Studies have shown that when the heat recovery efficiency of the heat recovery device reaches 70%, it can effectively reduce the heating energy consumption by 40% to 50%.
[0003] The most widely used air-conditioning system at present is the single-return air-conditioning 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 to the air-conditioned room or sent to the return air of the air-conditioned room after heating.
[0004] Under refrigeration conditions, in order to remove water vapor from the air, the evaporation temperature of the refrigerant in the traditional central air-conditioning system needs to be much lower than the dew point temperature of the air, which increases the temperature difference between the evaporation temperature and the condensation temperature of the refrigeration unit. The lower evaporation temperature reduces the performance coefficient of the refrigerant group to a certain extent. At the same time, under the dew point air supply state, the indoor temperature and humidity parameters may deviate from the design operating point, and the reheat air supply will consume more energy; and the temperature and humidity of the air are coupled in the surface cooling treatment, which does not really bring into play the energy efficiency of the cold source, which is not conducive to the subsequent operation and regulation. In the single return air handling unit, the mixed air is cooled and dehumidified by the surface cooler and then reheated by the reheater. This process of cooling and reheating is called "cold and hot offset", which causes a lot of energy waste.
[0005] The secondary return air system, which was created to address the drawback of the primary return air system, saves the extra energy applied by the reheater, but at the cost of lowering the dew point of the machine. As a result, on the one hand, the operating efficiency of the refrigeration system is reduced, and on the other hand, the use of natural cooling sources is further restricted. At the same time, the secondary return air system is also restricted in its use due to its poor anti-humidity ability and the inconvenience of adjustment and control.
[0006] Traditional central air-conditioning systems have numerous loops and complex systems. The energy consumption during the energy transmission process of 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 single return air air conditioning system based on a combined cooling and heating water ring heat pump. Summary of the invention
[0008] The object of the present invention is to provide an energy-saving single-return air conditioning system based on a cold and hot water-loop heat pump to solve the above-mentioned technical problems.
[0009] To achieve the above object, the present invention provides the following technical solutions:
[0010] An energy-saving single-return air conditioning system based on a cold and hot water-loop heat pump comprises a water circulation system and an air circulation system, wherein 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 led out of the cold water supply pipe outlet 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 led 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] The third pipeline led out from the other end of the exhaust heat exchanger is connected to one end of the fourth control valve; the fourth pipeline led out from the other end of the fourth control valve is connected to one end of the third cold water return pipe control valve; the fifth pipeline led out 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 ring heat pump unit; the sixth pipeline branched from the first pipeline is connected to one end of the second cold water supply pipe control valve; the seventh pipeline led out 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 pipeline led out from the other end of the fresh air heat exchanger is connected to one end of the third control valve; the ninth pipeline 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 pipeline led out from the other end of the second cold water return pipe control valve is connected to the fifth pipeline; the eleventh pipeline branched from the first pipeline is connected to one end of the first cold water supply pipe control valve; the twelfth pipeline 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 pipeline led out from the other end of the supply air heat exchanger is connected to one end of the second control valve; the fourteenth pipeline 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 pipeline led out from the other end of the first cold water return pipe control valve is connected to the fifth pipeline; the sixteenth pipeline 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 pipeline led out from the other end of the reheat heat exchanger is connected to one end of the first control valve; the eighteenth pipeline 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 pipeline branched from the sixteenth pipeline is connected to one end of the first cold water supply pipe control valve; the twentieth pipeline led out from the other end of the first cold water supply pipe control valve is connected to the twelfth pipeline; the twenty-first pipeline branched from the fourteenth pipeline is connected to one end of the first hot water return pipe control valve; the twenty-second pipeline led out from the other end of the first hot water return pipe control valve is connected to the eighteenth pipeline; the twenty-third pipeline branched from the nineteenth pipeline 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 led out 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 led out 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 led out 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 led out 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, a 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 mixes 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 a part 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 a part 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 at other positions in the air conditioning cabinet according to different humidification methods such as isothermal and isenthalpic; heat exchange devices such as the reheat heat exchanger, supply air heat exchanger, fresh air heat exchanger, and exhaust air heat exchanger can be used separately, partially, or all at the same time according to the actual single return air air conditioning treatment needs, and it is preferred that all of them be used at the same time.
[0022] Beneficial effects of the present invention: the water cycle includes a four-pipe water ring 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 air 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 based on an energy-saving single-return air conditioning system of a cold and hot combined water ring heat pump and 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 fresh air can be recovered The heat in the exhaust air is used to heat the supply air for secondary heating, which reduces the demand for supply air cooling and the energy loss caused by the cold and heat 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 cold and heat of the exhaust air and perform cold and heat treatment of the fresh air and supply air and secondary heating of the supply air 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 It is a schematic diagram of the principle of the air conditioning system of the present invention.
[0024] Reference numerals in the figure: 1, four-pipe water ring heat pump unit; LG, cold water supply pipe port of four-pipe water ring heat pump unit; LH, cold water return pipe port of four-pipe water ring heat pump unit; RG, hot water supply pipe port of four-pipe water ring heat pump unit; RH, hot water return pipe port of four-pipe water ring 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 outlet; RG, hot water supply outlet; RH, hot water return outlet
[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, the third cold water supply pipe control valve; LH9, the third cold water return pipe control valve; RG9, the third hot water supply pipe control valve; RH9, the third hot water return pipe control valve;
[0029] F1, exhaust air regulating valve; F2, return air regulating valve; F3, fresh air regulating valve; F4, exhaust fan; F5, humidifier; F6, supply air fan.
[0030] L1, the first pipeline; L2, the second pipeline; L3, the third pipeline; L4, the fourth pipeline; L5, the fifth pipeline; L6, the sixth pipeline; L7, the seventh pipeline; L8, the eighth pipeline; L9, the ninth pipeline; L10, the tenth pipeline; L11, the eleventh pipeline; L12, the twelfth pipeline; L13, the thirteenth pipeline; L14, the fourteenth pipeline; L15, the fifteenth pipeline; L16, the 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 described embodiments 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 creative work 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 conditioning system based on a cold and hot 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 air 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] The third pipeline 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 pipeline 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 pipeline 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 port LH of the four-pipe water ring heat pump unit 1; 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 out 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; the thirteenth pipeline 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 pipeline 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 pipeline L15 led out from the other end of the first cold water return pipe control valve LH5 is connected to the fifth pipeline L5; the sixteenth pipeline L16 led out from the cold water supply pipe port RG 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 port RH of the four-pipe water ring heat pump unit 1; the nineteenth pipeline L19 branched from the sixteenth pipeline L16 is connected to one end of the first cold water supply pipe control valve RG5; the twentieth pipeline L20 led out from the other end of the first cold water supply pipe control valve RG5 is connected to the twelfth pipeline L12; the 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 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 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 RG7 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, a part of it enters the exhaust passage 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 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 via 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 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 solenoid control valves, preferably solenoid valves.
[0044] Preferably, the exhaust fan F4 can be an equipment inside the air conditioning cabinet, or it can be a fan of a part of the exhaust external duct; the supply fan F7 can be an equipment inside the air conditioning cabinet, or it can be a fan of a part of the supply external duct; under winter 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 in 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 treatment requirements, and it is preferred that all of them are used at the same time.
[0045] Beneficial effects of the present invention: the water cycle 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, a supply air heat exchanger 9, and a fourth control valve 10; the air cycle includes an exhaust air regulating valve F1, a return air regulating valve F2, a fresh air regulating valve F3, an exhaust air fan F4, a humidifier F5, and a supply air fan F6; the system is based on an energy-saving single-return air conditioning system of a cold and hot combined water ring heat pump, which can meet the requirements of exhaust air cold and heat recovery, fresh air cold and heat treatment, supply air cold and heat treatment, and supply air secondary heating under various working conditions; in summer, the coldness in the exhaust air can be recovered to treat the fresh air and supply air It removes heat and humidifies, recovers heat in the fresh air and supply air for secondary heating of the supply air, reduces the demand for supply air cooling, and at the same time reduces the energy loss caused by the cold and heat 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 cold and heat of the exhaust air, perform cold and heat treatment of the fresh air and supply air, and perform secondary heating of the supply air under winter and summer working conditions, avoiding the energy consumption of electric heating in the conventional single-return air conditioning system, and 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.
[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] Under summer conditions, 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 condition of only exhaust air cooling recovery and processing of 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 water supply port of the evaporator of the four-pipe water ring heat pump unit 1 absorbs heat in the fresh air heat exchanger 7, and the cold water after the 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 water supply port of the condenser of the four-pipe water ring heat pump unit 1 releases heat in the exhaust air heat exchanger 9, and the hot water after the 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 the system is as follows: after the return air in the air-conditioned room enters through the return air port of the air-conditioning cabinet, a part of it enters the exhaust passage 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 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 port 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 via the supply air fan F6.
[0051] Use Example 2
[0052] Under summer working conditions, 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 heat extraction by supplying air only 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 water supply port of the evaporator of the four-pipe water ring heat pump unit 1 absorbs heat in the air supply heat exchanger 5, and the cold water after the 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 water supply port of the condenser of the four-pipe water ring heat pump unit 1 releases heat in the reheat heat exchanger 2, and the hot water after the 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 the system is as follows: after the return air in the air-conditioned room enters through the return air port of the air-conditioning cabinet, a part of it enters the exhaust passage 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 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 port 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 via the supply air fan F6.
[0055] Use Example 3
[0056] Under summer conditions, the energy-saving single-return air conditioning system based on the combined cold and hot water ring heat pump of the present invention is used as a summer refrigeration cycle to realize simultaneous exhaust air cooling recovery, fresh air heat recovery, and supply air heat extraction, and secondary heating of 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 water supply port of the evaporator 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 the 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 the 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 the system is as follows: after the return air in the air-conditioned room enters through the return air port of the air-conditioning cabinet, a part of it enters the exhaust passage 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 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 port 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 via the supply air fan F6.
[0059] Use Example 4
[0060] Under winter conditions, 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 winter heating cycle to realize the condition of only exhaust air heat recovery to heat the fresh air:
[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 air heat exchanger 9, and the cold water after the 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 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 after the temperature drop flows through the third control valve 8 and returns to the condenser return water port of the four-pipe water ring heat pump unit 1.
[0062] The air circulation of the system is as follows: after the return air in the air-conditioned room enters through the return air port of the air-conditioning cabinet, a part of it enters the exhaust passage 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 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 port 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 via the supply air fan F6.
[0063] Use Example 5
[0064] Under winter conditions, the energy-saving single-return air conditioning system based on the combined cold and hot water ring heat pump of the present invention is used as a winter heating cycle to realize simultaneous exhaust air heat recovery, fresh air heating, and supply air heating without secondary heating of the supply air:
[0065] The water cycle 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 water supply port of the evaporator of the four-pipe water ring heat pump unit 1 absorbs heat in the exhaust air 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 water supply port of the condenser of the four-pipe water ring heat pump unit 1 releases heat in the air supply 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 the system is as follows: after the return air in the air-conditioned room enters through the return air port of the air-conditioning cabinet, a part of it enters the exhaust passage 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 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 port 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 via the supply air fan F6.
[0067] Use Example 6
[0068] Under winter conditions, the energy-saving single-return air conditioning system based on the combined cold and hot water ring heat pump of the present invention is used as a winter heating cycle to realize simultaneous exhaust air heat recovery, fresh air heating, and non-heating of supply air, and secondary heating of the supply air:
[0069] The water circulation of the system is as follows: the first control valve 3 is opened, 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 air 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 water supply port of the condenser of the four-pipe water ring heat pump unit 1 releases heat in the reheat heat exchanger 2 and the fresh air heat exchanger 7, and the hot water after temperature drop flows through the third control valve 8 and the first control valve 3 and returns to the condenser return water port of the four-pipe water ring heat pump unit 1.
[0070] The air circulation of the system is as follows: after the return air in the air-conditioned room enters through the return air port of the air-conditioning cabinet, a part of it enters the exhaust passage 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 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 port 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 via the supply air fan F6.
[0071] Use Example 7
[0072] Under winter conditions, the energy-saving single-return air conditioning system based on the combined cold and hot water ring heat pump of the present invention is used as a winter heating cycle to realize simultaneous exhaust air heat recovery, fresh air heating, and supply air heating, and performs secondary heating of the supply air:
[0073] 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 water supply port of the evaporator of the four-pipe water ring heat pump unit 1 absorbs heat in the exhaust air heat exchanger 9, and the cold water after the 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 water supply port of the condenser of the four-pipe water ring heat pump unit 1 releases heat in the reheat heat exchanger 2, the supply air heat exchanger 5, and the fresh air heat exchanger 7, and the hot water after the temperature drop flows through the third control valve 8, the second control valve 6, and the first control valve 3 and returns to the condenser return water port of the four-pipe water ring heat pump unit 1.
[0074] The air circulation of the system is as follows: after the return air in the air-conditioned room enters through the return air port of the air-conditioning cabinet, a part of it enters the exhaust passage 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 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 port 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 via the supply air fan F6.
[0075] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.
Claims
1. An energy-saving single-return air conditioning system based on a cold and hot water-loop heat pump, comprising a water circulation system and an air circulation system, Features: 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), an air supply 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 an exhaust air regulating valve (F1), a return air regulating valve (F2), a fresh air regulating valve (F3), an exhaust air fan (F4), a humidifier (F5), and an air supply fan (F6); The first pipeline (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 pipeline (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 pipeline (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 pipeline (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 pipeline (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 (LH) of the four-pipe water ring heat pump unit (1); 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 second cold water supply pipe control valve ( The seventh pipeline (L7) led out from the other end of the fresh air heat exchanger (LG7) is connected to one end of the fresh air heat exchanger (7); 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 (L12) led out from the other end of the first cold water supply pipe control valve (LG5) is connected to one end of the supply air heat exchanger (5); the thirteenth pipeline (L13) led out from the other end of the supply air heat exchanger (5) is connected to one end of the second control valve (6); the second control valve ( 6 ) is connected to the first cold water return pipe control valve ( LH5 ); a fifteenth pipeline (L15) led out from the other end of the first cold water return pipe control valve (LH5) is connected to the fifth pipeline (L5); a sixteenth pipeline (L16) led out from the cold water supply pipe port (RG) of the four-pipe water ring heat pump unit (1) is connected to 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 port of the four-pipe water ring heat pump unit (1) (RH); a nineteenth pipeline (L19) branched from the sixteenth pipeline (L16) is connected to one end of the first cold water supply pipe control valve (RG5); a twentieth pipeline (L20) led out from the other end of the first cold water supply pipe control valve (RG5) 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); a 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 ( The twenty-third pipeline (L23) branched from the nineteenth pipeline (L19) is connected to one end of the second cold water supply pipe control valve (RG7); the twenty-fourth pipeline (L24) led out from the other end of the second cold water supply pipe control valve (RG7) is connected to the seventh pipeline (L7); the twenty-fifth pipeline (L25) branched 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 (L24) (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 out 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 out from the other end of the third hot water return pipe control valve (RH9) is connected to the twenty-sixth pipeline (L26).
2. An energy-saving primary return air conditioning system based on a combined cooling and heating water-loop heat pump as claimed in claim 1, Features: 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 passage through the exhaust air regulating valve (F1) and performs heat exchange 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 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 performs 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 to the air-conditioned room through the supply air fan (F6).
3. An energy-saving primary return air conditioning system based on a combined cooling and heating water ring heat pump as described in any one of claims 1-2, Features: 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. An energy-saving primary return air conditioning system based on a combined cooling and heating water ring heat pump according to any one of claims 1-2, Features: 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. An energy-saving primary return air conditioning system based on a combined cooling and heating water ring heat pump according to any one of claims 1 to 4, Features: 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 rate of the fluid passing through, and are all electric valves, solenoid valves or temperature control valves, preferably solenoid valves.
6. An energy-saving primary return air conditioning system based on a combined cooling and heating water ring heat pump according to any one of claims 1 to 5, Features: 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, preferably solenoid valves.
7. An energy-saving primary return air conditioning system based on a combined cooling and heating water ring heat pump according to any one of claims 1 to 6, Features: The exhaust fan (F4) can be a device inside the air conditioning cabinet, or it can be a fan of a part of the exhaust external duct; the supply air fan (F7) can be a device inside the air conditioning cabinet, or it can be a fan of a part of the supply air 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 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), 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, preferably all at the same time.