CN108253662B - Gas heat pump defrosting system - Google Patents
Gas heat pump defrosting system Download PDFInfo
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- CN108253662B CN108253662B CN201810006962.6A CN201810006962A CN108253662B CN 108253662 B CN108253662 B CN 108253662B CN 201810006962 A CN201810006962 A CN 201810006962A CN 108253662 B CN108253662 B CN 108253662B
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- water
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- antifreeze
- heat exchanger
- flue gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/04—Heat pumps of the sorption type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
- F24H4/04—Storage heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/027—Defrosting cycles for defrosting sorption type systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
- F28D21/0005—Recuperative heat exchangers the heat being recuperated from exhaust gases for domestic or space-heating systems
- F28D21/0007—Water heaters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a gas heat pump defrosting system which comprises a gas heat pump unit, an air duct, an air pipe, a defrosting heat exchanger, an antifreeze liquid loop, a water loop for heating antifreeze liquid, a heat storage water tank or a hot water pipe network, a heat pump heating water loop, a flue gas heat recoverer and a flue gas channel, wherein the air duct is communicated with the air duct; the air duct is sequentially provided with a defrosting heat exchanger, an evaporator and an axial flow fan; and a solid dehumidifying material is arranged on the defrosting heat exchanger. The invention does not adopt a method of defrosting after frosting, but reduces the relative humidity of air, thereby fundamentally preventing the evaporator from frosting. Compared with the traditional defrosting method after frosting, the method has the advantage of ensuring the stable operation of the gas heat pump unit, and also achieves the purposes of energy conservation and emission reduction.
Description
Technical Field
The invention relates to the field of gas heat pumps, in particular to a defrosting system of a gas heat pump.
Background
In recent years, with the improvement of living standard of people and the national emphasis on environmental protection, energy conservation and emission reduction, the air source heat pump unit is widely used as an energy-saving device. As one kind of air source heat pump unit, gas heat pump unit, utilizes the heat of gas combustion to drive the heat pump unit to work, and produces hot water or hot wind for heating in winter. The biggest problem of the air source heat pump unit in winter heating operation is frosting on the surface of an evaporator. When the evaporator is operated at a low ambient temperature for a long time, the surface temperature of the evaporator is lower than the dew point temperature of the humid air in the environment where the evaporator is located, and the hot humid air in the environment is changed from an unsaturated state to a saturated state and finally to an oversaturated state. At this time, a part of moisture in the environment condenses into liquid beads on the surface of the evaporator (including the outer surface of the fins and the coil pipe of the evaporator), and condensation occurs. Then, as the evaporator continues to operate, the condensed water droplets on the cold surface of the evaporator turn into a frost layer, which adheres to the surface of the evaporator, i.e., the evaporator frosts. Due to the formation and growth of the frost layer, the heat transfer resistance between the surface of the evaporator and the air is increased, and the flow resistance of the airflow passing through the evaporator is increased, so that the air flow passing through the evaporator is reduced, the heat exchange efficiency is obviously reduced, the heat exchange quantity between the air and the evaporator is reduced, the working condition of the heat pump unit is worsened, and even the heat pump unit cannot work normally. Therefore, air source heat pumps must timely defrost or otherwise prevent frost formation when operated under frosting conditions.
At present, the common defrosting methods of the air source heat pump unit mainly include the following three methods: electric heating defrosting method, reverse circulation defrosting method and hot gas bypass defrosting method. The electric heating defrosting is that an electric heating device with certain proper power is arranged on an evaporator, and when the evaporator needs to be defrosted, the electric heating device is electrified to generate heat for defrosting. The method has large power consumption, so the method is only suitable for small household heat pump air conditioners. The reverse circulation defrosting method is mainly used for defrosting in an air source heat pump unit at present, and the method adopts a four-way reversing valve to switch the heating running state of the air source heat pump unit into the refrigerating running state, and at the moment, the heat pump unit discharges heat absorbed indoors to an outdoor heat exchanger, so that a frost layer is melted, and the defrosting purpose is achieved. However, in the method, heat is absorbed from a room during defrosting, and after heating is recovered, hot air cannot be blown out for a long time, so that the indoor comfort is influenced; in addition, the system has the defects of severe pressure fluctuation, large generated mechanical impact and the like. The hot gas bypass defrosting method leads high-temperature working medium before entering the condenser into the evaporator, and raises the temperature of the evaporator to defrost. However, the air source heat pump unit cannot stably operate by the method, and performance is affected.
Therefore, those skilled in the art have devoted themselves to develop a gas heat pump defrosting system, which enables the gas heat pump unit to operate stably and the evaporator to be free from frost.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is the problem of evaporator frosting.
In order to achieve the purpose, the invention provides a gas heat pump defrosting system which comprises a gas heat pump unit, an air channel, an air pipe, a defrosting heat exchanger, an antifreeze liquid loop, a water loop for heating antifreeze liquid, a heat storage water tank or a hot water pipe network, a heat pump water heating loop, a flue gas heat recoverer and a flue gas channel; the gas heat pump unit comprises an axial flow fan, an evaporator, a generator, an absorber and a condenser; the air duct is sequentially provided with a defrosting heat exchanger, an evaporator and an axial flow fan; the anti-freezing liquid loop is sequentially provided with a defrosting heat exchanger, an anti-freezing liquid valve and an anti-freezing liquid pump; a heat storage water tank or a hot water pipe network, a valve A, a water pump A and an antifreeze heat exchanger are sequentially arranged on a water loop for heating antifreeze; a heat storage water tank or a hot water pipe network, a valve B, a water pump B, an absorber and a condenser are sequentially arranged on the heat pump heating water loop; a heat storage water tank or a hot water pipe network, a valve C, a water pump C and a flue gas heat recoverer are sequentially arranged on the flue gas heating water loop; the flue gas passage is sequentially provided with a flue gas heat recoverer and a waste gas outlet; and a solid dehumidifying material is arranged on the defrosting heat exchanger.
Furthermore, the water loops connected with the heat storage water tank or the hot water pipe network comprise a flue gas heating water loop, a heat pump heating water loop and a water loop for heating the antifreeze.
Further, the flue gas heating water loop heats the loop water by heat exchange between the flue gas and the flue gas heat recoverer.
Further, the heat pump heating water circuit heats the water in the circuit by exchanging heat with the condenser.
Further, the water circuit for heating the antifreeze solution exchanges heat with the antifreeze solution by the heat exchanger to raise the temperature of the antifreeze solution.
Further, the antifreeze fluid heat exchanger is a double-pipe heat exchanger.
Further, the defrosting heat exchanger is a tube-fin heat exchanger.
Further, the flue gas heat recoverer is a plate heat exchanger.
Further, after the axial flow fan is started, when air enters the air channel and passes through the defrosting heat exchanger, the dehumidifying material arranged on the defrosting heat exchanger absorbs moisture to form dry air and enters the evaporator in the dehumidifying mode, and in the regenerating mode, the air is heated, the relative humidity is reduced, and the dry air enters the evaporator.
Furthermore, air ducts are wrapped around the air duct between the defrosting heat exchanger and the evaporator.
Further, the water pump A, the water pump B and the water pump C are all hot water pumps.
Further, air in the air duct can leave the gas heat pump unit after passing through the defrosting heat exchanger, the evaporator and the axial flow fan.
Further, the antifreeze in the antifreeze circuit can flow through the antifreeze heat exchanger, the antifreeze valve, the antifreeze circulating pump, the defrosting heat exchanger, and then flow back to the antifreeze heat exchanger.
Further, water in the water loop for heating the antifreeze can flow through the heat storage water tank or the hot water pipe network, the valve A, the water pump A and the antifreeze heat exchanger and then flow back to the heat storage water tank or the hot water pipe network.
Further, the water in the heat pump heating water loop can flow through the heat storage water tank or the hot water pipe network, the valve B, the water pump B, the absorber and the condenser and then flow back to the heat storage water tank or the hot water pipe network.
Further, water in the water loop heated by the flue gas can flow through the heat storage water tank or the hot water pipe network, the valve C, the water pump C and the flue gas heat recoverer and then flow back to the heat storage water tank or the hot water pipe network.
Further 7, the flue gas in the flue gas channel can flow through the flue gas heat recovery device and the waste gas outlet and then leave the system.
Compared with the prior art, the invention has the following advantages:
in the invention, in the dehumidification mode operation, the solid dehumidification material arranged on the surface of the defrosting heat exchanger adsorbs moisture in the air, so that the relative humidity of the air entering the evaporator is reduced, and the frosting phenomenon of the evaporator caused by overlarge relative humidity of the air is prevented. Instead of defrosting after frosting, the relative humidity of the air is reduced, and the evaporator is prevented from frosting fundamentally. Compared with the traditional defrosting method after frosting, the method has the advantage of ensuring the stable operation of the gas heat pump unit.
In the present invention, in the regeneration mode of operation, the heated antifreeze is introduced into the tubes of the defrost heat exchanger to regenerate the solid desiccant material on the surface of the defrost heat exchanger and simultaneously raise the temperature of the air entering the evaporator to reduce the relative humidity. Similarly, under the operation of the regeneration mode, the relative humidity of air is reduced, the evaporator is fundamentally prevented from frosting, and the advantage of ensuring the stable operation of the gas heat pump unit is achieved.
In the invention, a flue gas heat recoverer is arranged to recover the heat of high-temperature flue gas discharged by a gas heat pump unit, heated circulating water is introduced into a heat storage water tank or a hot water pipe network, and the flue gas heat recovery amount in the whole heating season is enough to regenerate a defrosting heat exchanger. Meanwhile, the energy for heating the antifreeze comes from a heat storage water tank or a hot water pipe network, so that the stable source of heat required by the regeneration of the defrosting heat exchanger is ensured. The invention not only achieves the purposes of energy conservation and emission reduction, but also ensures the stable regeneration of the defrosting heat exchanger.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic flow diagram of the dehumidification mode operation of a gas heat pump defrost system in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic flow diagram of the regeneration mode operation of a gas heat pump defrost system in accordance with a preferred embodiment of the present invention;
wherein, 1-a gas heat pump unit, 2-an axial flow fan, 3-an evaporator and 4-a generator, 5-absorber, 6-condenser, 7-other part, 8-air pipe, 9-defrosting heat exchanger, 10-air channel, 11-antifreeze liquid loop, 12-antifreeze liquid pump, 13-antifreeze liquid valve, 14-antifreeze liquid heat exchanger, 15-water pump A, 16-valve A, 17-antifreeze liquid heating water loop, 18-heat storage water tank or hot water pipe network, 19-heat pump heating water loop, 20-water pump B, 21-valve B, 22-valve C, 23-flue gas heating water loop, 24-water pump C, 25-flue gas heat recoverer, 26-flue gas channel, 27-waste gas outlet, 28-fuel gas inlet.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
The present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1 and 2, a preferred embodiment of the present invention provides a gas heat pump defrosting system, which includes a gas heat pump unit 1, an air duct 10, an air duct 8, a defrosting heat exchanger 9 with solid dehumidifying material disposed thereon, an antifreeze solution circuit 11, a water circuit 17 for heating antifreeze solution, a hot water storage tank or hot water pipe network 18, a heat pump heating water circuit 19, a flue gas heating water circuit 23, a flue gas heat recovery unit 25, and a flue gas passage 26. The gas heat pump unit 1 comprises an axial flow fan 2, an evaporator 3, a generator 4, an absorber 5, a condenser 6, a gas inlet 28 and other parts 7; the air duct 10 is sequentially provided with a defrosting heat exchanger 9, an evaporator 3 and an axial flow fan 2; an air duct 8 is coated around an air duct 10 between the defrosting heat exchanger 9 and the evaporator 3; the anti-freezing liquid loop 11 is sequentially provided with a defrosting heat exchanger 9, an anti-freezing liquid heat exchanger 14, an anti-freezing liquid valve 13 and an anti-freezing liquid pump 12; a heat storage water tank or hot water pipe network 18, a valve A16, a water pump A15 and an antifreeze heat exchanger 14 are sequentially arranged on the water loop 17 for heating antifreeze; a heat storage water tank or hot water pipe network 18, a valve B21, a water pump B20, an absorber 5 and a condenser 6 are sequentially arranged on the heat pump heating water loop 19; the flue gas heating water loop 23 is sequentially provided with a heat storage water tank or hot water pipe network 18, a valve C22, a water pump C24 and a flue gas heat recoverer 25; the flue gas passage 26 is provided with a flue gas heat recovery device 25 and a waste gas outlet 27 in sequence. The surface of the defrosting heat exchanger 9 is provided with a solid dehumidifying material.
Fig. 1 is a schematic diagram of the working flow of the dehumidification mode of the present invention. The working process is as follows:
flue gas heating water flow: the gas enters the generator 4 of the gas heat pump unit 1 through the gas inlet 28 to be combusted, heat energy is provided for the heat pump unit, the generated flue gas leaves the generator 4 and sequentially passes through the flue gas heat recovery device 25 and the waste gas outlet 27 through the flue gas passage 26, and then is discharged out of the gas heat pump unit 1, so that an open loop is formed. In this process, the high temperature flue gas heats the flue gas heat recovery unit 25, so that the water in the pipe is heated. In the flue gas heating water loop 23, circulating water from the heat storage water tank or the hot water pipe network 18 sequentially passes through the valve C22, the water pump C24 and the flue gas heat recoverer 25 and then returns to the heat storage water tank or the hot water pipe network 18, so that a closed loop is formed. Wherein the water is heated up at the flue gas heat recovery device 25.
The heat pump water heating process comprises the following steps: in the heat pump water heating circuit 19, water from the hot water storage tank or the hot water pipe network 18 passes through the valve B21, the water pump B20, the absorber 5 and the condenser 6 in sequence, and then returns to the hot water storage tank or the hot water pipe network 18 to form a closed circuit. The water absorbs heat at the absorber 5 and the condenser 6. The condenser pipe adopts a sleeve pipe, the condenser needs to radiate heat, and water in the water pipe absorbs heat. Forming a process in which the water is heated.
The heating process of the antifreeze: in the water circuit 17 for heating the antifreeze, both the valve a16 and the water pump a15 are closed, so that the water in the antifreeze heating circuit 17 is not running. Likewise, the antifreeze valve 13 and the antifreeze pump 12 on the antifreeze circuit 11 are both closed and the antifreeze is not running. At this point the antifreeze heat exchanger is also not heated, but because of the previous heating there is still a certain temperature.
Defrosting process: the defrosting heat exchanger is in a dehumidification mode, and air enters from the air duct 10 and flows through the defrosting heat exchanger 9, the evaporator 3 and the axial flow fan 2 in sequence. The working process is as follows: due to the air suction effect of the axial flow fan 2, ambient air passes through the surface of the fins of the defrosting heat exchanger 9, is absorbed by the solid dehumidifying material arranged on the fins, reduces the relative humidity of the air, then enters the evaporator 3 of the gas heat pump unit 1 through the air channel surrounded by the air pipe 8 to be absorbed by heat, and then leaves the gas heat pump unit 1 through the axial flow fan 2 to form an open loop. This process ensures that the air flowing through the evaporator is dry air. Thereby preventing the evaporator from frosting.
Fig. 2 is a schematic diagram of the operation flow of the regeneration mode of the present invention. The working process is as follows:
flue gas heating water flow: the gas enters the generator 4 of the gas heat pump unit 1 through the gas inlet 28 to be combusted, heat energy is provided for the heat pump unit, the generated flue gas leaves the generator 4 and sequentially passes through the flue gas heat recovery device 25 and the waste gas outlet 27 through the flue gas passage 26, and then is discharged out of the gas heat pump unit 1, so that an open loop is formed. In this process, the high temperature flue gas heats the flue gas heat recovery unit 25, so that the water in the pipe is heated. In the flue gas heating water loop 23, circulating water from the heat storage water tank or the hot water pipe network 18 sequentially passes through the valve C22, the water pump C24 and the flue gas heat recoverer 25 and then returns to the heat storage water tank or the hot water pipe network 18, so that a closed loop is formed. Wherein the water is heated up at the flue gas heat recovery device 25.
The heat pump water heating process comprises the following steps: in the water loop 19 heated by the heat pump, circulating water from the heat storage water tank or the hot water pipe network 18 passes through the valve B21, the water pump B20, the absorber 5 and the condenser 6 in turn and then returns to the heat storage water tank or the hot water pipe network 18 to form a closed loop. The water absorbs heat at the absorber 5 and the condenser 6. The condenser pipe adopts a sleeve pipe, the condenser needs to radiate heat, and water in the water pipe absorbs heat. Forming a process in which the water is heated.
The heating process of the antifreeze: in the water circuit 17 for heating the antifreeze, water from the hot water storage tank or the hot water pipe network 18 passes through the valve a16, the water pump a15 and the antifreeze heat exchanger 14 in sequence and then returns to the hot water storage tank or the hot water pipe network 18. In the water circuit 17 for heating the antifreeze, when the hot water from the hot water storage tank or the hot water pipe network 18 enters the antifreeze heat exchanger 14, the hot water exchanges heat with the antifreeze passing through the antifreeze heat exchanger, releases heat, reduces the temperature, and flows back to the hot water storage tank or the hot water pipe network 18. The antifreeze in the antifreeze circuit 11 passes through an antifreeze heat exchanger 14, absorbs heat released by hot water, then the temperature rises, then the antifreeze flows through an antifreeze valve 13 and an antifreeze liquid pump 12, enters the defrosting heat exchanger 9, releases the heat to heat the solid dehumidifying material arranged on the fin surface of the defrosting heat exchanger 9, so that the solid dehumidifying material is regenerated, the dehumidifying capacity is recovered, and simultaneously the air entering the evaporator is heated, so that the relative humidity of the air is reduced, and the evaporator is prevented from frosting. The antifreeze then flows back to the antifreeze heat exchanger 14. Forming a closed circulation loop.
The purposes of reducing the relative humidity of air and preventing the surface of the evaporator 3 of the gas heat pump unit 1 from frosting can be continuously achieved through the mutual automatic switching of the dehumidification mode and the regeneration mode.
In the present invention, in the dehumidification mode operation, the relative humidity of the air entering the evaporator 3 is reduced by adsorbing moisture in the air through the solid dehumidifying material disposed on the surface of the defrosting heat exchanger 9, so as to prevent the occurrence of the frosting phenomenon of the evaporator 3 due to the excessive relative humidity of the air. In the regeneration mode of operation, the heated antifreeze fluid is introduced into the tubes of the defrost heat exchanger 9 to regenerate the solid desiccant material on the surface of the defrost heat exchanger 9 and simultaneously raise the temperature of the air entering the evaporator 3 to reduce the relative humidity. The effect of reducing the relative humidity of the air can be achieved in both modes. Compared with other defrosting modes, the invention does not adopt a method of defrosting after frosting, but reduces the relative humidity of air, and fundamentally prevents the evaporator 3 from frosting. Compared with the traditional defrosting method after frosting, the method has the advantage of ensuring the stable operation of the gas heat pump unit 1.
In the invention, a flue gas heat recovery device 25 is arranged to recover the heat of high-temperature flue gas discharged by the gas heat pump unit 1, heated circulating water is introduced into the heat storage water tank or the hot water pipe network 18, and the flue gas heat recovery amount in the whole heating season is enough to regenerate dehumidifying materials. Meanwhile, the energy for heating the antifreeze comes from the hot water storage tank or the hot water pipe network 18, so that the stable source of heat required by the regeneration of the dehumidifying material is ensured. The invention not only achieves the purposes of energy conservation and emission reduction, but also ensures the stable regeneration of the dehumidifying material.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (4)
1. A gas heat pump defrosting system is characterized by comprising a gas heat pump unit, an air duct, a defrosting heat exchanger, an antifreeze liquid loop, a water loop for heating antifreeze liquid, a heat storage water tank or a hot water pipe network, a heat pump water heating loop, a flue gas heat recoverer and a flue gas channel; the gas heat pump unit comprises an axial flow fan, an evaporator, a generator, an absorber and a condenser; the defrosting heat exchanger, the evaporator and the axial flow fan are sequentially arranged on the air duct; the defrosting heat exchanger, the antifreeze valve and the antifreeze pump are sequentially arranged on the antifreeze loop; the heat storage water tank or the hot water pipe network, a valve A, a water pump A and the antifreeze heat exchanger are sequentially arranged on the water loop for heating antifreeze; the heat pump heating water loop is sequentially provided with the heat storage water tank or the hot water pipe network, a valve B, a water pump B, the absorber and the condenser; the flue gas heating water loop is sequentially provided with the heat storage water tank or the hot water pipe network, a valve C, a water pump C and the flue gas heat recoverer; the smoke passage is sequentially provided with the smoke heat recoverer and a waste gas outlet; a solid dehumidifying material is arranged on the defrosting heat exchanger;
the water loops connected with the heat storage water tank or the hot water pipe network comprise the flue gas heating water loop, the heat pump heating water loop and the water loop for heating the antifreeze solution;
the flue gas passage is configured such that the flue gas flows through the flue gas recuperator, exiting the system through the exhaust gas outlet; the water in the flue gas heating water loop, which is configured to be in the loop, flows through the heat storage water tank or the hot water pipe network, the valve C, the water pump C and the flue gas heat recoverer and then flows back to the heat storage water tank or the hot water pipe network; the flue gas heat recoverer is configured to exchange heat between the flue gas heating water circuit and the flue gas passage, so that water in the flue gas heating water circuit is heated;
the heat pump heating water circuit is configured to enable water in the circuit to flow through the hot water storage tank or the hot water pipe network, the valve B, the water pump B, the absorber and the condenser and then flow back to the hot water storage tank or the hot water pipe network; the heat pump heating water circuit is configured to enable the heat pump heating water circuit to exchange heat with the condenser, so that the water of the heat pump heating water circuit is heated;
the water loop for heating the antifreeze is configured in such a way that water in the loop flows through the hot water storage tank or the hot water pipe network, the valve A, the water pump A and the antifreeze heat exchanger and then flows back to the hot water storage tank or the hot water pipe network; the antifreeze circuit is configured such that the antifreeze in the circuit flows through the antifreeze heat exchanger, the antifreeze valve, the antifreeze pump, the defrost heat exchanger, and back to the antifreeze heat exchanger; the antifreeze heat exchanger is configured to exchange heat between the water circuit for heating antifreeze and the antifreeze circuit, so as to raise the temperature of the antifreeze in the antifreeze circuit;
after the axial flow fan is started, in a dehumidification mode, when air enters the air channel and passes through the defrosting heat exchanger, a dehumidification material arranged on the defrosting heat exchanger absorbs moisture to form dry air, and the dry air enters the evaporator; in a regeneration mode, the warmed antifreeze solution heats the dehumidifying material on the surface of the defrosting heat exchanger and the air passing through the defrosting heat exchanger, so that the dehumidifying material is regenerated and the relative humidity of the air entering the evaporator is reduced;
air pipes are coated on the periphery of the air channel between the defrosting heat exchanger and the evaporator;
the air in the air channel can leave the gas heat pump unit after passing through the defrosting heat exchanger, the evaporator and the axial flow fan.
2. The gas heat pump defrost system of claim 1 wherein said antifreeze heat exchanger is a double pipe heat exchanger.
3. A gas heat pump defrost system as in claim 1 wherein said defrost heat exchanger is a tube and fin heat exchanger.
4. The gas heat pump defrost system of claim 1 wherein said flue gas recuperator is a plate heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810006962.6A CN108253662B (en) | 2018-01-04 | 2018-01-04 | Gas heat pump defrosting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN109654766A (en) * | 2018-12-05 | 2019-04-19 | 河南优备冷暖设备有限公司 | Frostless absorption heat pump and its working principle |
| CN110319616B (en) * | 2019-06-26 | 2021-03-05 | 上海理工大学 | Frostless type gas heat pump system |
| CN116642277B (en) * | 2023-07-27 | 2023-09-15 | 南京师范大学 | Energy storage defrosting device for heat recovery of gas boiler |
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| JP2001133073A (en) * | 1999-11-01 | 2001-05-18 | Osaka Gas Co Ltd | Absorption refrigerating device |
| CN203907811U (en) * | 2013-08-28 | 2014-10-29 | 广东美的制冷设备有限公司 | Air conditioning system reducing frosting speed and outdoor unit thereof |
| CN106257160A (en) * | 2016-07-27 | 2016-12-28 | 江苏大学 | A kind of Frostless air-source heat pump system based on solid absorption technology |
| CN107314571A (en) * | 2017-07-11 | 2017-11-03 | 新奥（中国）燃气投资有限公司 | Heat pump and its heat recovery method |
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| JP2001133073A (en) * | 1999-11-01 | 2001-05-18 | Osaka Gas Co Ltd | Absorption refrigerating device |
| CN203907811U (en) * | 2013-08-28 | 2014-10-29 | 广东美的制冷设备有限公司 | Air conditioning system reducing frosting speed and outdoor unit thereof |
| CN106257160A (en) * | 2016-07-27 | 2016-12-28 | 江苏大学 | A kind of Frostless air-source heat pump system based on solid absorption technology |
| CN107314571A (en) * | 2017-07-11 | 2017-11-03 | 新奥（中国）燃气投资有限公司 | Heat pump and its heat recovery method |
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