Efficient air source heat pump hot water system based on building waste heat phase change recovery

Abstract

The invention relates to an efficient air source heat pump hot water system based on building waste heat phase change recovery, which comprises a chilled water circulation system, a cooling water circulation system, a central air conditioner host, a building waste heat phase change recovery system, an air source heat pump hot water system and a hot water system, wherein the central air conditioner host is respectively connected with the chilled water circulation system, the cooling water circulation system and the building waste heat phase change recovery system, the cooling water circulation system is connected with the cooling water circulation system, and the building waste heat phase change recovery system is respectively connected with the air source heat pump hot water system and the hot water system. Waste heat released by a central air conditioner, air energy outside a building or solar energy and waste heat in the building can be absorbed through the building waste heat phase change recovery system, the building waste heat phase change recovery system is combined with an air source heat pump to heat a hot water system in the building, the energy efficiency of the hot water system can be effectively improved, and the heating effect of the system is improved; and natural gas or electric energy is greatly saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air source heat pumps, and in particular to a high-efficiency air source heat pump hot water system based on phase change recovery of building waste heat. Background Art

[0002] With the development of my country's economy and the increase in economic activities, the demand for urban buildings is becoming more and more vigorous, the volume of new buildings is getting larger and larger, and the area of ​​the inner area of ​​the building is increasing accordingly. Since the inner area is far away from the outer wall of the building, the impact of the outdoor environment on the interior is smaller, and the continuous heat generated by various equipment, lighting, and personnel in the inner area is greater than the heat dissipation of the inner area, and the heat accumulates, causing the indoor temperature to rise. Therefore, in winter, the inner area of ​​the building still needs to be cooled. Such inner areas exist in large buildings such as high-end office buildings, shopping malls, supermarkets, hypermarkets, and hotels.

[0003] As a highly efficient domestic hot water system, air source heat pump hot water system is widely used in various places. However, air source heat pump hot water system also has shortcomings. The most obvious one is that when the outdoor air temperature is low in winter, the system energy efficiency is low and the energy utilization rate decreases; at the same time, the maximum heating capacity of the system decreases, the required water outlet temperature cannot be reached, and the energy supply quality cannot meet the requirements. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and propose a high-efficiency air source heat pump hot water system based on phase change recovery of building waste heat. The building waste heat phase change recovery system can absorb the waste heat released by the central air-conditioning, the air energy or solar energy outside the building, and the waste heat inside the building. It is combined with the air source heat pump to heat the hot water system in the building, which can effectively improve the energy efficiency of the hot water system, improve the heating effect of the system, and greatly save natural gas or electricity.

[0005] The present invention solves the technical problem by adopting the following technical solutions:

[0006] A high-efficiency air-source heat pump hot water system based on phase-change recovery of building waste heat, comprising a chilled water circulation system, a cooling water circulation system, a central air-conditioning main unit, a building waste heat phase-change recovery system, an air-source heat pump hot water system and a hot water system, wherein the central air-conditioning main unit is respectively connected to the chilled water circulation system, the cooling water circulation system and the building waste heat phase-change recovery system, the cooling water circulation system is connected to the cooling water circulation system, and the building waste heat phase-change recovery system is respectively connected to the air-source heat pump hot water system and the hot water system;

[0007] The chilled water circulation system: the low-temperature chilled water flowing out of the air conditioner host evaporator is pressurized by the refrigeration pump and sent into the chilled water pipe, enters the room for heat exchange, takes away the heat in the room, and finally returns to the host evaporator; the indoor fan is used to blow air through the chilled water pipe to reduce the air temperature and accelerate indoor heat exchange;

[0008] Cooling water circulation system: When the chilled water circulation system performs indoor heat exchange, it will inevitably take away a large amount of indoor heat energy. This heat energy is transferred to the cooling water through the refrigerant in the main unit, which increases the cooling water temperature. The cooling pump presses the heated cooling water into the cooling water tower to exchange heat with the atmosphere, and then returns it to the main unit condenser after reducing the temperature.

[0009] Central air conditioner host: low-pressure gaseous refrigerant is pressurized by the host compressor and enters the host condenser and gradually condenses into high-pressure liquid. During the condensation process, the refrigerant will release a large amount of heat energy, which is absorbed by the cooling water in the condenser and sent to the outdoor cooling tower;

[0010] Building waste heat phase change recovery system: multiple small evaporators absorb the heat of the host condenser, the building's external area and the cooling tower, and transfer the heat absorbed by the small evaporator and the heat absorbed by the heat absorber to the hot water system through the cold liquid circulation system to recover the waste heat;

[0011] Air source heat pump hot water system: The air source heat pump compressor absorbs low-temperature and low-pressure medium gas, compresses it into a high-temperature and high-pressure gas state, and enters the condenser. The high-temperature medium in the condenser releases heat, heats the water in the hot water system into a low-temperature medium, passes through the expansion valve and becomes a low-temperature and low-pressure gas, and enters the evaporator for circulation;

[0012] Hot water system: Through circulating water pumps and central heating pipes, the heated water is transported to the indoor fan coil units, heat sinks, floor heating or hot water tanks for heating or water supply.

[0013] Moreover, the chilled water circulation system includes a chilled water pump, an indoor fan and a chilled water pipeline.

[0014] Moreover, an expansion water tank is installed near the water suction port of the freezing pump, and the expansion water tank is used to accommodate and compensate for the expansion and contraction of water in the system.

[0015] Moreover, the cooling water circulation system includes a cooling pump, a cooling water pipeline, a cooling tower and a condenser.

[0016] Moreover, the building waste heat phase change recovery system includes a recovery circulation pump, a heat absorbing plate, a cold liquid circulation system and a small evaporator.

[0017] Moreover, the heat absorbing plate is arranged inside the building to absorb the waste heat inside the building. The small evaporator is arranged at the outer frame of the building, the main condenser or the cooling tower to recover the waste heat from the air energy and solar energy at the outer frame. The recovery circulation pump provides energy for movement for the cold liquid circulation system, so that the cold liquid circulation system can circulate between the heat absorbing plate, the small evaporator and the hot water system.

[0018] Moreover, a cooling circulating liquid is arranged in the cold liquid circulation system, and the cooling circulating liquid is arranged as a mixture of lithium chloride, ethylene glycol and water, wherein the mass fraction ratio of lithium chloride, ethylene glycol and water is (20-30):(5-15):(55-75).

[0019] The advantages and positive effects of the present invention are:

[0020] The present invention includes a chilled water circulation system, a cooling water circulation system, a central air-conditioning main unit, a building waste heat phase change recovery system, an air source heat pump hot water system and a hot water system, wherein the central air-conditioning main unit is respectively connected to the chilled water circulation system, the cooling water circulation system and the building waste heat phase change recovery system, the cooling water circulation system is connected to the cooling water circulation system, and the building waste heat phase change recovery system is respectively connected to the air source heat pump hot water system and the hot water system, wherein the building waste heat phase change recovery system can absorb the waste heat released by the central air-conditioning, the air energy or solar energy outside the building and the waste heat inside the building, and is combined with the air source heat pump to heat the hot water system in the building, which can effectively improve the energy efficiency of the hot water system, improve the heating effect of the system, and greatly save natural gas or electric energy. At the same time, the system of the present invention can effectively reutilize the surplus heat produced in the daily production of the building, give play to its surplus value, convert it into hot water to feed back heat to the building, effectively improve the energy loss of the building during daily use, and reduce the cost of building use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural diagram of the system of Example 1 of the present invention;

[0022] Figure 2 is a structural diagram of the system of embodiment 2 of the present invention;

[0023] Figure 3 This is a structural diagram of the system of Example 3 of the present invention.

[0024] Description of labels:

[0025] 1- central air conditioning main unit; 101- main unit evaporator; 102- main unit condenser; 2- refrigeration pump; 201- indoor fan; 3- expansion water tank; 5- cooling pump; 501- cooling tower; 6- building waste heat phase change recovery system; 602- heat absorption plate; 603- small evaporator; 7- air source heat pump evaporator; 701- air source heat pump condenser; 702- expansion valve; 8- hot water system. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below with reference to the accompanying drawings.

[0027] Embodiment 1:

[0028] like Figure 1As shown, an embodiment of the present invention provides a high-efficiency air source heat pump hot water system based on phase change recovery of building waste heat, including: a chilled water circulation system, a cooling water circulation system, a central air-conditioning main unit, a building waste heat phase change recovery system, an air source heat pump hot water system and a hot water system, wherein the central air-conditioning main unit is respectively connected to the chilled water circulation system, the cooling water circulation system and the building waste heat phase change recovery system, the cooling water circulation system is connected to the cooling water circulation system, and the building waste heat phase change recovery system is respectively connected to the air source heat pump hot water system and the hot water system.

[0029] Chilled water circulation system: The chilled water circulation system consists of a chilled pump 2, an indoor fan 201 and a chilled water pipeline. In this system, the low-temperature chilled water flowing out of the air conditioner host evaporator 101 is pressurized by the chilled pump and sent into the chilled water pipeline, enters the room for heat exchange, takes away the heat in the room, and finally returns to the host evaporator. The indoor fan is used to blow air through the chilled water pipeline, reduce the air temperature, and accelerate indoor heat exchange. An expansion water tank 3 is installed near the water inlet of the chilled pump. The expansion water tank is used to accommodate and compensate for the expansion and contraction of water in the system.

[0030] Cooling water circulation system: The cooling water circulation system consists of a cooling pump 5, cooling water pipes, cooling water towers and condensers. While the cooling water circulation system performs indoor heat exchange, it will inevitably take away a large amount of indoor heat energy. This heat energy is transferred to the cooling water through the refrigerant in the host, which increases the temperature of the cooling water. The cooling pump presses the heated cooling water into the cooling water tower to exchange heat with the atmosphere, and then returns it to the host condenser 102 after reducing the temperature;

[0031] Central air conditioner host 1: The low-pressure gaseous refrigerant is pressurized by the host compressor and enters the host condenser and gradually condenses into high-pressure liquid. During the condensation process, the refrigerant releases a large amount of heat energy, which is absorbed by the cooling water in the condenser and sent to the outdoor cooling tower 201;

[0032] Building waste heat phase change recovery system 6: The building waste heat phase change recovery system consists of a recovery circulation pump, a heat absorbing plate 602, a cold liquid circulation system and a small evaporator 603. The heat of the main condenser, the building outer area and the cooling tower is absorbed by multiple small evaporators, and the heat absorbed by the small evaporator and the heat absorbed by the heat absorbing plate are transferred to the hot water system 8 through the cold liquid circulation system to recover the waste heat. The heat absorbing plate is arranged inside the building to absorb the waste heat inside the building. The small evaporator is arranged at the outer frame of the building, the main condenser or the cooling tower to recover the waste heat from the air energy and solar energy at the outer frame. The circulation pump provides energy for the cold liquid circulation system to circulate between the heat absorbing plate, the small evaporator and the hot water system. A cooling circulation liquid is arranged in the cold liquid circulation system, and the cooling circulation liquid is arranged as a mixture of lithium chloride, ethylene glycol and water, wherein the mass fraction ratio of lithium chloride, ethylene glycol and water is 22:5:73.

[0033] Air source heat pump hot water system: The air source heat pump compressor absorbs low-temperature and low-pressure medium gas, compresses it into a high-temperature and high-pressure gas state, and enters the condenser. The high-temperature medium in the condenser releases heat, heats the water in the hot water system into a low-temperature medium, passes through the expansion valve 702 and becomes a low-temperature and low-pressure gas, and enters the evaporator for circulation;

[0034] Hot water system: Through circulating water pumps and central heating pipes, the heated water is transported to the indoor fan coil units, heat sinks, floor heating or hot water tanks for heating or water supply.

[0035] Embodiment 2:

[0036] like Figure 2 The embodiment of the present invention provides a high-efficiency air source heat pump hot water system based on phase change recovery of building waste heat, comprising:

[0037] Chilled water circulation system: The chilled water circulation system consists of a chilled pump, an indoor fan and chilled water pipes. The low-temperature chilled water flowing out of the air conditioner host evaporator is pressurized by the chilled pump and sent to the chilled water pipe, enters the room for heat exchange, takes away the heat in the room, and finally returns to the host evaporator. The indoor fan is used to blow air through the chilled water pipe, reduce the air temperature, and accelerate indoor heat exchange. An expansion water tank is installed near the water inlet of the chilled pump. The expansion water tank is used to accommodate and compensate for the expansion and contraction of water in the system.

[0038] Cooling water circulation system: The cooling water circulation system consists of a cooling pump, cooling water pipes, cooling water towers and condensers. While the chilled water circulation system performs indoor heat exchange, it will inevitably take away a large amount of indoor heat energy. This heat energy is transferred to the cooling water through the refrigerant in the host, causing the cooling water temperature to rise. The cooling pump presses the heated cooling water into the cooling water tower to exchange heat with the atmosphere, and then returns it to the host condenser after the temperature is reduced;

[0039] Central air conditioner host: low-pressure gaseous refrigerant is pressurized by the host compressor and enters the host condenser and gradually condenses into high-pressure liquid. During the condensation process, the refrigerant will release a large amount of heat energy, which is absorbed by the cooling water in the condenser and sent to the outdoor cooling tower;

[0040] Building waste heat phase change recovery system: The building waste heat phase change recovery system consists of a recovery circulation pump, a heat absorbing plate, a cold liquid circulation system and a small evaporator. The heat of the main condenser, the building's outer area and the cooling tower is absorbed by multiple small evaporators. The heat absorbed by the small evaporator and the heat absorbed by the heat absorbing plate are absorbed by the cold liquid circulation system, and the cooling circulation liquid is introduced into the air source heat pump condenser 701 for waste heat recovery. The heat absorbing plate is arranged inside the building to absorb the waste heat inside the building. The small evaporator is arranged at the outer frame of the building, the main condenser or the cooling tower to recover the waste heat from the air energy and solar energy at the outer frame. The circulation pump provides energy for movement for the cold liquid circulation system, so that the cold liquid circulation system can circulate between the heat absorbing plate, the small evaporator and the hot water system. The cold liquid circulation system is provided with a cooling circulation liquid, which is set as a mixture of lithium chloride, ethylene glycol and water, wherein the mass fraction ratio of lithium chloride, ethylene glycol and water is 22:5:73.

[0041] Air source heat pump hot water system: The air source heat pump compressor absorbs low-temperature and low-pressure medium gas, compresses it into a high-temperature and high-pressure gas state, and enters the condenser. The high-temperature medium in the condenser releases heat, heats the water in the hot water system into a low-temperature medium, passes through the expansion valve and becomes a low-temperature and low-pressure gas, and enters the evaporator for circulation;

[0042] Hot water system: Through circulating water pumps and central heating pipes, the heated water is transported to the indoor fan coil units, heat sinks, floor heating or hot water tanks for heating or water supply.

[0043] Embodiment three:

[0044] like Figure 3 The embodiment of the present invention provides a high-efficiency air source heat pump hot water system based on phase change recovery of building waste heat, comprising:

[0045] Chilled water circulation system: The chilled water circulation system consists of a chilled pump, an indoor fan and chilled water pipes. The low-temperature chilled water flowing out of the air conditioner host evaporator is pressurized by the chilled pump and sent to the chilled water pipe, enters the room for heat exchange, takes away the heat in the room, and finally returns to the host evaporator. The indoor fan is used to blow air through the chilled water pipe, reduce the air temperature, and accelerate indoor heat exchange. An expansion water tank is installed near the water inlet of the chilled pump. The expansion water tank is used to accommodate and compensate for the expansion and contraction of water in the system.

[0046] Cooling water circulation system: The cooling water circulation system consists of a cooling pump, cooling water pipes, cooling water towers and condensers. While the chilled water circulation system performs indoor heat exchange, it will inevitably take away a large amount of indoor heat energy. This heat energy is transferred to the cooling water through the refrigerant in the host, causing the cooling water temperature to rise. The cooling pump presses the heated cooling water into the cooling water tower to exchange heat with the atmosphere, and then returns it to the host condenser after the temperature is reduced;

[0047] Central air conditioner host: low-pressure gaseous refrigerant is pressurized by the host compressor and enters the host condenser and gradually condenses into high-pressure liquid. During the condensation process, the refrigerant will release a large amount of heat energy, which is absorbed by the cooling water in the condenser and sent to the outdoor cooling tower;

[0048] Building waste heat phase change recovery system: The building waste heat phase change recovery system consists of a recovery circulation pump, a heat absorbing plate, a cold liquid circulation system and a small evaporator. The heat of the main condenser, the outer area of ​​the building and the cooling tower is absorbed by multiple small evaporators. The heat absorbed by the small evaporator and the heat absorbed by the heat absorbing plate are transferred to the air near the air source heat pump evaporator 7 through the cold liquid circulation system to recover the waste heat. The heat absorbing plate is arranged inside the building to absorb the waste heat inside the building. The small evaporator is arranged at the outer frame of the building, the main condenser or the cooling tower to recover the waste heat from the air energy and solar energy at the outer frame. The circulation pump provides energy for the cold liquid circulation system to circulate between the heat absorbing plate, the small evaporator and the hot water system. A cooling circulation liquid is arranged in the cold liquid circulation system, and the cooling circulation liquid is arranged as a mixture of lithium chloride, ethylene glycol and water, wherein the mass fraction ratio of lithium chloride, ethylene glycol and water is 22:5:73.

[0049] Air source heat pump hot water system: The air source heat pump compressor absorbs low-temperature and low-pressure medium gas, compresses it into a high-temperature and high-pressure gas state, and enters the condenser. The high-temperature medium in the condenser releases heat, heats the water in the hot water system into a low-temperature medium, passes through the expansion valve and becomes a low-temperature and low-pressure gas, and enters the evaporator for circulation;

[0050] Hot water system: Through circulating water pumps and central heating pipes, the heated water is transported to the indoor fan coil units, heat sinks, floor heating or hot water tanks for heating or water supply.

[0051] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive. Therefore, the present invention includes but is not limited to the embodiments described in the specific implementation manner. Any other implementation manners derived by those skilled in the art based on the technical solution of the present invention also fall within the scope of protection of the present invention.

Claims

1. A high-efficiency air source heat pump hot water system based on phase change recovery of building waste heat, characterized by: It includes a chilled water circulation system, a cooling water circulation system, a central air-conditioning main unit, a building waste heat phase change recovery system, an air source heat pump hot water system and a hot water system, wherein the central air-conditioning main unit is respectively connected to the chilled water circulation system, the cooling water circulation system and the building waste heat phase change recovery system, the cooling water circulation system is connected to the cooling water circulation system, and the building waste heat phase change recovery system is respectively connected to the air source heat pump hot water system and the hot water system; The chilled water circulation system: the low-temperature chilled water flowing out of the air conditioner host evaporator is pressurized by the refrigeration pump and sent into the chilled water pipe, enters the room for heat exchange, takes away the heat in the room, and finally returns to the host evaporator; the indoor fan is used to blow air through the chilled water pipe to reduce the air temperature and accelerate indoor heat exchange; Cooling water circulation system: When the chilled water circulation system performs indoor heat exchange, it will inevitably take away a large amount of indoor heat energy. This heat energy is transferred to the cooling water through the refrigerant in the main unit, which increases the cooling water temperature. The cooling pump presses the heated cooling water into the cooling water tower to exchange heat with the atmosphere, and then returns it to the main unit condenser after reducing the temperature. Central air conditioner host: low-pressure gaseous refrigerant is pressurized by the host compressor and enters the host condenser and gradually condenses into high-pressure liquid. During the condensation process, the refrigerant will release a large amount of heat energy, which is absorbed by the cooling water in the condenser and sent to the outdoor cooling tower; Building waste heat phase change recovery system: multiple small evaporators absorb the heat of the host condenser, the building's external area and the cooling tower, and transfer the heat absorbed by the small evaporator and the heat absorbed by the heat absorber to the hot water system through the cold liquid circulation system to recover the waste heat; Air source heat pump hot water system: The air source heat pump compressor absorbs low-temperature and low-pressure medium gas, compresses it into a high-temperature and high-pressure gas state, and enters the condenser. The high-temperature medium in the condenser releases heat, heats the water in the hot water system into a low-temperature medium, passes through the expansion valve and becomes a low-temperature and low-pressure gas, and enters the evaporator for circulation; Hot water system: Through circulating water pumps and central heating pipes, the heated water is transported to the indoor fan coil units, heat sinks, floor heating or hot water tanks for heating or water supply.

2. According to claim 1, a high-efficiency air source heat pump hot water system based on phase change recovery of building waste heat is characterized by: The chilled water circulation system comprises a chilled water pump, an indoor fan and a chilled water pipeline.

3. According to claim 2, a high-efficiency air source heat pump hot water system based on phase change recovery of building waste heat is characterized by: An expansion water tank is installed near the water suction port of the freezing pump, and the expansion water tank is used to accommodate and compensate for the expansion and contraction of water in the system.

4. According to claim 1, a high-efficiency air source heat pump hot water system based on phase change recovery of building waste heat is characterized by: The cooling water circulation system includes a cooling pump, a cooling water pipeline, a cooling tower and a condenser.

5. According to claim 1, a high-efficiency air source heat pump hot water system based on phase change recovery of building waste heat is characterized by: The building waste heat phase change recovery system comprises a recovery circulation pump, a heat absorbing plate, a cold liquid circulation system and a small evaporator.

6. A high-efficiency air source heat pump hot water system based on phase change recovery of building waste heat according to claim 5, characterized in that: The heat absorbing sheet is arranged inside the building to absorb the waste heat inside the building. The small evaporator is arranged at the outer frame of the building, the main unit condenser or the cooling tower to recover the waste heat from the air energy and solar energy at the outer frame. The recovery circulation pump provides the energy for movement of the cold liquid circulation system, so that the cold liquid circulation system can circulate between the heat absorbing sheet, the small evaporator and the hot water system.

7. The high-efficiency air source heat pump hot water system based on phase change recovery of building waste heat according to claim 5 is characterized by: The cooling liquid circulation system is provided with a cooling circulating liquid, and the cooling circulating liquid is set as a mixture of lithium chloride, ethylene glycol and water, wherein the mass fraction ratio of lithium chloride, ethylene glycol and water is (20-30): (5-15): (55-75).

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