CA2530567A1 - Multi-range cross defrosting heat pump system - Google Patents
Multi-range cross defrosting heat pump system Download PDFInfo
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- CA2530567A1 CA2530567A1 CA 2530567 CA2530567A CA2530567A1 CA 2530567 A1 CA2530567 A1 CA 2530567A1 CA 2530567 CA2530567 CA 2530567 CA 2530567 A CA2530567 A CA 2530567A CA 2530567 A1 CA2530567 A1 CA 2530567A1
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- Prior art keywords
- evaporator
- defrosting
- refrigerant
- defrost
- flow
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
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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
- F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
- F25B2341/001—Ejectors not being used as compression device
- F25B2341/0014—Ejectors with a high pressure hot primary flow from a compressor discharge
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention provides an air-condition heat pump system and two-stage defrosting control method for continuous operation under an environment temperature range from 20 degree to negative 40 degree Celsius or lower. The heat pump system employs different defrosting methods under different temperature and humidity conditions. A ventilation and humidity control system is also provided for implementing the cross defrosting heat pump system within an indoor dimension.
Claims (27)
1. A cross reverses defrosting heat pump system comprising:
a) main compressor for pressurizing the refrigerant, b) main condenser following main compressor for heating purpose, c) main expansion valve following main condenser, d) first evaporator and second evaporator receiving the refrigerant through main expansion valve, e) first upper-flow control valve for controlling the refrigerant flow into the intake side of first evaporator, first lower-flow control valve for controlling the refrigerant flow out of the discharge side of first evaporator into the intake side of main compressor, g) second upper-flow control valve for controlling the refrigerant flow into the intake side of second evaporator, second lower-flow control valve for controlling the refrigerant flow out of the discharge side of second evaporator into the intake side of main compressor, h) first reverse-flow control valve for controlling the refrigerant flow from main compressor directly into the intake side of first evaporator, i) second reverse-flow control valve for controlling the refrigerant flow from main compressor directly into the intake side of second evaporator, j) first one-way valve and first expansion valve associated with the refrigerant delivery pipe between the discharge side of first evaporator and intake side of second evaporator, k) second one-way valve and second expansion valve associated with the refrigerant delivery pipe between the discharge side of second evaporator and intake side of first evaporator, 1) separate heat insulation means for first evaporator and second evaporator, m) first venting fan for venting the air out of the heat insulated space associated with first evaporator, n) second venting fan for venting the air out of the heat insulated space associated with second evaporator, o) the logic control circuit for controlling the two stage defrosting operation;
the system is capable of two stage defrosting operation, where first evaporator and second evaporator operate together until the defrosting process is required; when the defrosting process is required and the outdoor temperature is enough for defrosting with ambient air flow, first evaporator and second evaporator takes turn to defrost while the operating evaporator continues to operate and absorb the heat energy require for the heating purpose;
when first evaporator is defrosting with the ambient air flow, first upper-flow control valve is closed and first lower-flow control valve is closed to stop the refrigerant flow from main expansion valve, and first venting fan is operating at full capacity to increase the ambient air flow through first evaporator;
when second evaporator is defrosting with the ambient air flow, second upper-flow control is closed and second lower-flow control valve is closed to stop the refrigerant flow from main expansion valve, and second venting fan is operating at full capacity to increase the ambient air flow through second evaporator;
when first evaporator is defrosting with the second stage defrosting method, first upper-flow control valve is closed and first lower-flow control valve is closed to stop the refrigerant flow from main expansion valve, first reverse-flow control valve is open to provide passage for the pressurized refrigerant from main compressor into first evaporator for melting the frost on first evaporator, and the first venting fan stops operating to prevent the heat from escaping into open air, while the pressurized refrigerant heats up first evaporator and flows into the refrigerant delivery pipe into the intake side of second evaporator;
when second evaporator is defrosting with the second stage defrosting method, second upper-flow control valve is closed and second lower-flow control valve is closed to stop the refrigerant flow from main expansion valve, second reverse-flow control valve is open to provide passage for the pressurized refrigerant from main compressor into second evaporator for melting the frost on second evaporator, and the second venting fan stops operating to prevent the heat from escaping into open air, while the pressurized refrigerant heats up second evaporator and flows into the refrigerant delivery pipe into the intake side of first evaporator.
a) main compressor for pressurizing the refrigerant, b) main condenser following main compressor for heating purpose, c) main expansion valve following main condenser, d) first evaporator and second evaporator receiving the refrigerant through main expansion valve, e) first upper-flow control valve for controlling the refrigerant flow into the intake side of first evaporator, first lower-flow control valve for controlling the refrigerant flow out of the discharge side of first evaporator into the intake side of main compressor, g) second upper-flow control valve for controlling the refrigerant flow into the intake side of second evaporator, second lower-flow control valve for controlling the refrigerant flow out of the discharge side of second evaporator into the intake side of main compressor, h) first reverse-flow control valve for controlling the refrigerant flow from main compressor directly into the intake side of first evaporator, i) second reverse-flow control valve for controlling the refrigerant flow from main compressor directly into the intake side of second evaporator, j) first one-way valve and first expansion valve associated with the refrigerant delivery pipe between the discharge side of first evaporator and intake side of second evaporator, k) second one-way valve and second expansion valve associated with the refrigerant delivery pipe between the discharge side of second evaporator and intake side of first evaporator, 1) separate heat insulation means for first evaporator and second evaporator, m) first venting fan for venting the air out of the heat insulated space associated with first evaporator, n) second venting fan for venting the air out of the heat insulated space associated with second evaporator, o) the logic control circuit for controlling the two stage defrosting operation;
the system is capable of two stage defrosting operation, where first evaporator and second evaporator operate together until the defrosting process is required; when the defrosting process is required and the outdoor temperature is enough for defrosting with ambient air flow, first evaporator and second evaporator takes turn to defrost while the operating evaporator continues to operate and absorb the heat energy require for the heating purpose;
when first evaporator is defrosting with the ambient air flow, first upper-flow control valve is closed and first lower-flow control valve is closed to stop the refrigerant flow from main expansion valve, and first venting fan is operating at full capacity to increase the ambient air flow through first evaporator;
when second evaporator is defrosting with the ambient air flow, second upper-flow control is closed and second lower-flow control valve is closed to stop the refrigerant flow from main expansion valve, and second venting fan is operating at full capacity to increase the ambient air flow through second evaporator;
when first evaporator is defrosting with the second stage defrosting method, first upper-flow control valve is closed and first lower-flow control valve is closed to stop the refrigerant flow from main expansion valve, first reverse-flow control valve is open to provide passage for the pressurized refrigerant from main compressor into first evaporator for melting the frost on first evaporator, and the first venting fan stops operating to prevent the heat from escaping into open air, while the pressurized refrigerant heats up first evaporator and flows into the refrigerant delivery pipe into the intake side of second evaporator;
when second evaporator is defrosting with the second stage defrosting method, second upper-flow control valve is closed and second lower-flow control valve is closed to stop the refrigerant flow from main expansion valve, second reverse-flow control valve is open to provide passage for the pressurized refrigerant from main compressor into second evaporator for melting the frost on second evaporator, and the second venting fan stops operating to prevent the heat from escaping into open air, while the pressurized refrigerant heats up second evaporator and flows into the refrigerant delivery pipe into the intake side of first evaporator.
2. A cross defrosting heat pump system comprising:
a) One compressor 201 for pumping and pressurizing the refrigerant into a main condenser 202, b) First evaporator 203 and second evaporator 204 following said main condenser 202, c) An expansion valve 207 for regulating the pressure drop between said main condenser 202 and said two evaporators 203 204, d) First evaporator control valve 212 associated with said first evaporator 203 for stopping the flow of the refrigerant during defrosting process of said first evaporator 203, e) Second evaporator control valve 211 associated with said second evaporator 204 for stopping the flow of the refrigerant during defrosting process of said second evaporator 204, f) First defrost condenser 205 connecting and receiving the refrigerant from the discharge port of said compressor 201, and the refrigerant exiting into said second evaporator 204, g) First defrost control valve 214 for admitting the refrigerant flow into said first defrost condenser 205 during the defrosting process of said first evaporator 203, i) Second defrost condenser 206 connecting and receiving the refrigerant from the discharge port of said compressor 201, and the refrigerant exiting into said first evaporator 203, j) Second defrost control valve 213 for admitting the refrigerant flow into said defrost condenser 206 during the defrosting process of said second evaporator 204;
k) First flow regulator 221 connected between said first defrost condenser 205 and said second evaporator 204 for controlling the refrigerant flow and the heat energy required for the defrosting process, and second flow regulator 222 connected between second defrost condenser 206 and said first evaporator 203 for controlling the refrigerant flow and the heat energy required for the defrosting process;
1) Heat transferring means for said two defrost condensers 205 206 transferring the heat onto said two evaporators 203 204 respectively during defrosting process;
wherein when the defrosting process is not necessary, both said first control valve 213 and said second control valve 214 remain closed to stop refrigerant flow into first defrost condenser and second defrost condenser;
when first evaporator 203 is defrosting with the first stage defrosting method, first evaporator control valve 212 is closed to stop refrigerant flow into first evaporator 203, and then first venting fan is running at full capacity to defrost first evaporator 203 with the ambient air flow;
when second evaporator 204 is defrosting with the first stage defrosting method, second evaporator control valve 211 is closed to stop refrigerant flow into second evaporator 204, and then second venting fan is running at full capacity to defrost second evaporator 204 with the ambient air flow;
when first evaporator 203 is defrosting with the second stage defrosting method, first evaporator control valve 212 is closed to stop refrigerant flowing into first evaporator 203, first defrost control valve 214 is open to allow pressurized refrigerant into first defrost condenser 205 to provide heat for defrosting first evaporator 203, then the refrigerant in first defrost condenser 205 flows through its associated flow regulator 221 into the intake side of second evaporator 204, first venting fan stops running to prevent heat from escaping out of the heat insulated space of first evaporator 203;
when second evaporator 204 is defrosting with the second stage defrosting method, second evaporator control valve 211 is closed to stop refrigerant flowing into second evaporator 204, second defrost control valve 213 is open to allow pressurized refrigerant into second defrost condenser 206 to provide heat for defrosting second evaporator 204, then the refrigerant in second defrost condenser 206 flows through its associated flow regulator 222 into the intake side of first evaporator 203, second venting fan stops running to prevent heat from escaping out of the heat insulated space of first evaporator 204;
during the second stage defrosting, the defrosting evaporator is heated up by the heat absorbed by the functioning evaporator and generated by the compressor so that the heat pump system does not require additional energy from other source to defrost.
a) One compressor 201 for pumping and pressurizing the refrigerant into a main condenser 202, b) First evaporator 203 and second evaporator 204 following said main condenser 202, c) An expansion valve 207 for regulating the pressure drop between said main condenser 202 and said two evaporators 203 204, d) First evaporator control valve 212 associated with said first evaporator 203 for stopping the flow of the refrigerant during defrosting process of said first evaporator 203, e) Second evaporator control valve 211 associated with said second evaporator 204 for stopping the flow of the refrigerant during defrosting process of said second evaporator 204, f) First defrost condenser 205 connecting and receiving the refrigerant from the discharge port of said compressor 201, and the refrigerant exiting into said second evaporator 204, g) First defrost control valve 214 for admitting the refrigerant flow into said first defrost condenser 205 during the defrosting process of said first evaporator 203, i) Second defrost condenser 206 connecting and receiving the refrigerant from the discharge port of said compressor 201, and the refrigerant exiting into said first evaporator 203, j) Second defrost control valve 213 for admitting the refrigerant flow into said defrost condenser 206 during the defrosting process of said second evaporator 204;
k) First flow regulator 221 connected between said first defrost condenser 205 and said second evaporator 204 for controlling the refrigerant flow and the heat energy required for the defrosting process, and second flow regulator 222 connected between second defrost condenser 206 and said first evaporator 203 for controlling the refrigerant flow and the heat energy required for the defrosting process;
1) Heat transferring means for said two defrost condensers 205 206 transferring the heat onto said two evaporators 203 204 respectively during defrosting process;
wherein when the defrosting process is not necessary, both said first control valve 213 and said second control valve 214 remain closed to stop refrigerant flow into first defrost condenser and second defrost condenser;
when first evaporator 203 is defrosting with the first stage defrosting method, first evaporator control valve 212 is closed to stop refrigerant flow into first evaporator 203, and then first venting fan is running at full capacity to defrost first evaporator 203 with the ambient air flow;
when second evaporator 204 is defrosting with the first stage defrosting method, second evaporator control valve 211 is closed to stop refrigerant flow into second evaporator 204, and then second venting fan is running at full capacity to defrost second evaporator 204 with the ambient air flow;
when first evaporator 203 is defrosting with the second stage defrosting method, first evaporator control valve 212 is closed to stop refrigerant flowing into first evaporator 203, first defrost control valve 214 is open to allow pressurized refrigerant into first defrost condenser 205 to provide heat for defrosting first evaporator 203, then the refrigerant in first defrost condenser 205 flows through its associated flow regulator 221 into the intake side of second evaporator 204, first venting fan stops running to prevent heat from escaping out of the heat insulated space of first evaporator 203;
when second evaporator 204 is defrosting with the second stage defrosting method, second evaporator control valve 211 is closed to stop refrigerant flowing into second evaporator 204, second defrost control valve 213 is open to allow pressurized refrigerant into second defrost condenser 206 to provide heat for defrosting second evaporator 204, then the refrigerant in second defrost condenser 206 flows through its associated flow regulator 222 into the intake side of first evaporator 203, second venting fan stops running to prevent heat from escaping out of the heat insulated space of first evaporator 204;
during the second stage defrosting, the defrosting evaporator is heated up by the heat absorbed by the functioning evaporator and generated by the compressor so that the heat pump system does not require additional energy from other source to defrost.
3. A cross defrosting heat pump with separate refrigerant circulation comprising:
a) at least three separate refrigerant circulation system, b) first refrigerant circulation system consists of first compressor for pressurizing the refrigerant, first condenser connecting to the discharge side of first compressor, first expansion valve following first condenser, first evaporator receiving the refrigerant from first condenser through first expansion valve, first defrost condenser connecting its intake side to the discharge side of first compressor and its discharge side to first expansion valve, first defrost control valve for controlling the refrigerant flow into first defrost condenser, first one-way valve for stopping the refrigerant flow from first condenser into first defrost condenser, first venting fan for controlling air flow through first evaporator, c) second refrigerant circulation system consists of second compressor for pressurizing the refrigerant, second condenser connecting to the discharge side of second compressor, second expansion valve following second condenser, second evaporator receiving the refrigerant from second condenser through second expansion valve, second defrost condenser connecting its intake side to the discharge side of second compressor and its discharge side to second expansion valve, second defrost control valve for controlling the refrigerant flow into second defrost condenser, second one-way valve for stopping the refrigerant flow from second condenser into second defrost condenser, second venting fan for controlling air flow through second evaporator, d) third refrigerant circulation system consists of third compressor for pressurizing the refrigerant, third condenser connecting to the discharge side of third compressor, third expansion valve following third condenser, third evaporator receiving the refrigerant from third condenser through third expansion valve, third defrost condenser connecting its intake side to the discharge side of third compressor and its discharge side to third expansion valve, third defrost control valve for controlling the refrigerant flow into third defrost condenser, third one-way valve for stopping the refrigerant flow from third condenser into third defrost condenser, third venting fan for controlling air flow through third evaporator, d) first evaporator is in direct contact with third evaporator, second evaporator is in direct contact with second evaporator, third evaporator is in direct contact with first evaporator, e) separate heat insulation means for each evaporator;
when all three evaporators are operating, all venting fan are operating to provide the ambient air flow through each evaporator, each defrost control valve is closed to stop the refrigerant flow through each defrost condenser;
when the system is defrosting with the first stage defrosting method, the defrosting evaporator stops its refrigerant flow by turning off its associated compressor, and its associated venting fan is running at full capacity to defrost with the ambient air flow;
when fust evaporator is defrosting with the second stage defrosting method, first compressor stops operating, and first venting fan stops operating to prevent the heat from escaping into open air, third defrost control valve is open to allow the refrigerant flowing through third defrost condenser which heats up first evaporator and melts the frost on first evaporator;
when second evaporator is defrosting with the second stage defrosting method, second compressor stops operating, and second venting fan stops operating to prevent the heat from escaping into open air, first defrost control valve is open to allow the refrigerant flowing through first defrost condenser which heats up second evaporator and melts the frost on second evaporator;
when third evaporator is defrosting with the second stage defrosting method, third compressor stops operating, and third venting fan stops operating to prevent the heat from escaping into open air, second defrost control valve is open to allow the refrigerant flowing through second defrost condenser which heats up third evaporator and melts the frost on third evaporator.
a) at least three separate refrigerant circulation system, b) first refrigerant circulation system consists of first compressor for pressurizing the refrigerant, first condenser connecting to the discharge side of first compressor, first expansion valve following first condenser, first evaporator receiving the refrigerant from first condenser through first expansion valve, first defrost condenser connecting its intake side to the discharge side of first compressor and its discharge side to first expansion valve, first defrost control valve for controlling the refrigerant flow into first defrost condenser, first one-way valve for stopping the refrigerant flow from first condenser into first defrost condenser, first venting fan for controlling air flow through first evaporator, c) second refrigerant circulation system consists of second compressor for pressurizing the refrigerant, second condenser connecting to the discharge side of second compressor, second expansion valve following second condenser, second evaporator receiving the refrigerant from second condenser through second expansion valve, second defrost condenser connecting its intake side to the discharge side of second compressor and its discharge side to second expansion valve, second defrost control valve for controlling the refrigerant flow into second defrost condenser, second one-way valve for stopping the refrigerant flow from second condenser into second defrost condenser, second venting fan for controlling air flow through second evaporator, d) third refrigerant circulation system consists of third compressor for pressurizing the refrigerant, third condenser connecting to the discharge side of third compressor, third expansion valve following third condenser, third evaporator receiving the refrigerant from third condenser through third expansion valve, third defrost condenser connecting its intake side to the discharge side of third compressor and its discharge side to third expansion valve, third defrost control valve for controlling the refrigerant flow into third defrost condenser, third one-way valve for stopping the refrigerant flow from third condenser into third defrost condenser, third venting fan for controlling air flow through third evaporator, d) first evaporator is in direct contact with third evaporator, second evaporator is in direct contact with second evaporator, third evaporator is in direct contact with first evaporator, e) separate heat insulation means for each evaporator;
when all three evaporators are operating, all venting fan are operating to provide the ambient air flow through each evaporator, each defrost control valve is closed to stop the refrigerant flow through each defrost condenser;
when the system is defrosting with the first stage defrosting method, the defrosting evaporator stops its refrigerant flow by turning off its associated compressor, and its associated venting fan is running at full capacity to defrost with the ambient air flow;
when fust evaporator is defrosting with the second stage defrosting method, first compressor stops operating, and first venting fan stops operating to prevent the heat from escaping into open air, third defrost control valve is open to allow the refrigerant flowing through third defrost condenser which heats up first evaporator and melts the frost on first evaporator;
when second evaporator is defrosting with the second stage defrosting method, second compressor stops operating, and second venting fan stops operating to prevent the heat from escaping into open air, first defrost control valve is open to allow the refrigerant flowing through first defrost condenser which heats up second evaporator and melts the frost on second evaporator;
when third evaporator is defrosting with the second stage defrosting method, third compressor stops operating, and third venting fan stops operating to prevent the heat from escaping into open air, second defrost control valve is open to allow the refrigerant flowing through second defrost condenser which heats up third evaporator and melts the frost on third evaporator.
4. An electric cross-defrosting heat pump system comprising:
a) One compressor for pumping and pressurizing the refrigerant into a main condenser, b) First evaporator and second evaporator following said main condenser, c) An expansion valve for regulating the pressure drop between said main condenser and said first evaporator and said second evaporator, d) First control valve associated with said first evaporator for stopping the flow of the refrigerant during defrosting process of said first evaporator, e) Second control valve associated with said second evaporator for stopping the flow of the refrigerant during defrosting process of said second evaporator, f) First electric heating element for defrosting said first evaporator during the defrosting process of said first evaporator, g) Second electric heating element for defrosting said second evaporator during the defrosting process of said second evaporator, h) frost sensor means and the logic control circuit for detecting the frost condition and controlling the defrosting process;
when the defrosting process is not necessary, both said first control valve and said second control valve remain closed;
when first evaporator is defrosting with the first stage defrosting method, first evaporator control valve is closed to stop refrigerant flow into first evaporator, and then first venting fan is running at full capacity to defrost first evaporator with the ambient air flow;
when second evaporator is defrosting with the first stage defrosting method, second evaporator control valve is closed to stop refrigerant flow into second evaporator, and then second venting fan is running at full capacity to defrost second evaporator with the ambient air flow;
when first evaporator is defrosting with the second stage defrosting method, first evaporator control valve is closed to stop refrigerant flowing into first evaporator, first electric heating element is conducted to generate heat to defrost first evaporator, first venting fan stops running to prevent heat from escaping out of the heat insulated space of first evaporator;
when second evaporator is defrosting with the second stage defrosting method, second evaporator control valve is closed to stop refrigerant flowing into second evaporator, second electric heating element is conducted to generate heat to defrost second evaporator, second venting fan stops running to prevent heat from escaping out of the heat insulated space of second evaporator.
a) One compressor for pumping and pressurizing the refrigerant into a main condenser, b) First evaporator and second evaporator following said main condenser, c) An expansion valve for regulating the pressure drop between said main condenser and said first evaporator and said second evaporator, d) First control valve associated with said first evaporator for stopping the flow of the refrigerant during defrosting process of said first evaporator, e) Second control valve associated with said second evaporator for stopping the flow of the refrigerant during defrosting process of said second evaporator, f) First electric heating element for defrosting said first evaporator during the defrosting process of said first evaporator, g) Second electric heating element for defrosting said second evaporator during the defrosting process of said second evaporator, h) frost sensor means and the logic control circuit for detecting the frost condition and controlling the defrosting process;
when the defrosting process is not necessary, both said first control valve and said second control valve remain closed;
when first evaporator is defrosting with the first stage defrosting method, first evaporator control valve is closed to stop refrigerant flow into first evaporator, and then first venting fan is running at full capacity to defrost first evaporator with the ambient air flow;
when second evaporator is defrosting with the first stage defrosting method, second evaporator control valve is closed to stop refrigerant flow into second evaporator, and then second venting fan is running at full capacity to defrost second evaporator with the ambient air flow;
when first evaporator is defrosting with the second stage defrosting method, first evaporator control valve is closed to stop refrigerant flowing into first evaporator, first electric heating element is conducted to generate heat to defrost first evaporator, first venting fan stops running to prevent heat from escaping out of the heat insulated space of first evaporator;
when second evaporator is defrosting with the second stage defrosting method, second evaporator control valve is closed to stop refrigerant flowing into second evaporator, second electric heating element is conducted to generate heat to defrost second evaporator, second venting fan stops running to prevent heat from escaping out of the heat insulated space of second evaporator.
5. A cross defrosting heat pump with self-ventilation and humidity control system comprising:
a) main compressor for pressurizing the refrigerant, b) main condenser following said main compressor, c) main expansion valve following said main condenser, d) first evaporator following said main expansion valve and connecting its discharge side to said main compressor, e) second evaporator following said main expansion valve and connecting its discharge side to said main compressor, f) first control valve associated with said first evaporator for stopping the refrigerant flow when said first evaporator is defrosting, g) second control valve associated with said second evaporator for stopping the refrigerant flow when said second evaporator is defrosting, h) heat insulation means for each said evaporator, i) indoor temperature sensor, j) first temperature sensor associated with the heat insulated space associated with said first evaporator, k) second temperature sensor associated with the heat insulated space associated with said second evaporator, 1) outdoor temperature sensor, m) first indoor-air intake control valve and first indoor-air-intake fan for controlling the indoor air flow into the heat insulated space associated with said first evaporator, n) second indoor-air-intake control valve and second indoor-air-intake fan for controlling the indoor air flow into the heat insulated space associated with said second evaporator, o) outdoor-air-intake duct for providing air flow passage from outdoor into the heat insulated space of each evaporator, p) cold-air-exit duct for providing air flow passage from the heat insulated space of each evaporator to outdoor, p) first venting fan for controlling and venting the air flow from the heat insulated space of said first evaporator to said cold-air-exit duct, q) second venting fan for controlling and venting the air flow from the heat insulated space of said second evaporator to said cold-air-exit duct, r) the control logics circuit;
when first evaporator is defrosting with the first stage defrosting method, first evaporator stops the refrigerant flow by closing first control valve, first outdoor-air-intake control is open and first venting fan is operating at full speed to defrost first evaporator with the ambient air flow;
when second evaporator is defrosting with the second stage defrosting method, second evaporator stops the refrigerant flow by closing second control valve, second outdoor-air-intake is open and second venting fan is operating at full speed to defrost second evaporator with the ambient air flow;
during the first stage defrosting method, the defrosting evaporator stops operating, other evaporator continues to operate for heating and defrosting purpose;
When first evaporator is defrosting with the second stage defrosting method, first evaporator stops the refrigerant flow by closing first control valve, first outdoor-air-intake control valve is closed and first indoor-air-intake control valve is open so that the frost on first evaporator melts by absorbing the heat from the indoor air flow; first indoor-air-intake fan is operating to control the indoor air flow into the heat insulated space of first evaporator; first venting fan is operating at the speed based on the temperature difference measured by outdoor temperature sensor and first temperature sensor;
the control logic circuit compares the outdoor temperature and the temperature within the heat insulated space associated with first evaporator, when the temperature measured by first temperature sensor is higher than the outdoor temperature, first venting fan will run slowly or stop running to prevent the heat from escaping into the open air through cold-air-exit duct;
during the defrosting process of first evaporator, second evaporator continues to operate to absorb heat from the ambient air flow so that main condenser can maintain the temperature within the indoor space;
When second evaporator is defrosting with the second stage defrosting method, second evaporator stops the refrigerant flow by closing second control valve, second outdoor-air-intake control valve is closed and second indoor-air-intake control valve is open so that the frost on second evaporator melts by absorbing the heat from the indoor air flow; second indoor-air-intake fan is operating to control the indoor air flow into the heat insulated space of second evaporator; second venting fan is operating at the speed based on the temperature difference measured by outdoor temperature sensor and second temperature sensor; at the beginning of the defrosting process, second venting fan is running slowly to vent the cold air, allowing the indoor air to flow into the heat insulated space of second evaporator; the control logic circuit compares the outdoor temperature and the temperature within the insulated space associated with second evaporator, when the temperature measured by second temperature sensor is higher than the outdoor temperature, second venting fan will run slowly or stop running to prevent the heat from escaping into the open air through cold-air-exit duct.
During the defrosting process of the second evaporator, first evaporator continues to operate to absorb heat from the ambient air flow so that main condenser can maintain the temperature within the indoor space;
During the second stage defrosting of each evaporator, each indoor-air-intake fan is drawing the indoor air into its associated evaporator, and the outdoor air is drawing into the indoor space through other ventilation duct for ventilation purpose, or an indoor ventilation fan can co-work with this system and draws outdoor air into the indoor area during the second stage defrosting of each evaporator.
a) main compressor for pressurizing the refrigerant, b) main condenser following said main compressor, c) main expansion valve following said main condenser, d) first evaporator following said main expansion valve and connecting its discharge side to said main compressor, e) second evaporator following said main expansion valve and connecting its discharge side to said main compressor, f) first control valve associated with said first evaporator for stopping the refrigerant flow when said first evaporator is defrosting, g) second control valve associated with said second evaporator for stopping the refrigerant flow when said second evaporator is defrosting, h) heat insulation means for each said evaporator, i) indoor temperature sensor, j) first temperature sensor associated with the heat insulated space associated with said first evaporator, k) second temperature sensor associated with the heat insulated space associated with said second evaporator, 1) outdoor temperature sensor, m) first indoor-air intake control valve and first indoor-air-intake fan for controlling the indoor air flow into the heat insulated space associated with said first evaporator, n) second indoor-air-intake control valve and second indoor-air-intake fan for controlling the indoor air flow into the heat insulated space associated with said second evaporator, o) outdoor-air-intake duct for providing air flow passage from outdoor into the heat insulated space of each evaporator, p) cold-air-exit duct for providing air flow passage from the heat insulated space of each evaporator to outdoor, p) first venting fan for controlling and venting the air flow from the heat insulated space of said first evaporator to said cold-air-exit duct, q) second venting fan for controlling and venting the air flow from the heat insulated space of said second evaporator to said cold-air-exit duct, r) the control logics circuit;
when first evaporator is defrosting with the first stage defrosting method, first evaporator stops the refrigerant flow by closing first control valve, first outdoor-air-intake control is open and first venting fan is operating at full speed to defrost first evaporator with the ambient air flow;
when second evaporator is defrosting with the second stage defrosting method, second evaporator stops the refrigerant flow by closing second control valve, second outdoor-air-intake is open and second venting fan is operating at full speed to defrost second evaporator with the ambient air flow;
during the first stage defrosting method, the defrosting evaporator stops operating, other evaporator continues to operate for heating and defrosting purpose;
When first evaporator is defrosting with the second stage defrosting method, first evaporator stops the refrigerant flow by closing first control valve, first outdoor-air-intake control valve is closed and first indoor-air-intake control valve is open so that the frost on first evaporator melts by absorbing the heat from the indoor air flow; first indoor-air-intake fan is operating to control the indoor air flow into the heat insulated space of first evaporator; first venting fan is operating at the speed based on the temperature difference measured by outdoor temperature sensor and first temperature sensor;
the control logic circuit compares the outdoor temperature and the temperature within the heat insulated space associated with first evaporator, when the temperature measured by first temperature sensor is higher than the outdoor temperature, first venting fan will run slowly or stop running to prevent the heat from escaping into the open air through cold-air-exit duct;
during the defrosting process of first evaporator, second evaporator continues to operate to absorb heat from the ambient air flow so that main condenser can maintain the temperature within the indoor space;
When second evaporator is defrosting with the second stage defrosting method, second evaporator stops the refrigerant flow by closing second control valve, second outdoor-air-intake control valve is closed and second indoor-air-intake control valve is open so that the frost on second evaporator melts by absorbing the heat from the indoor air flow; second indoor-air-intake fan is operating to control the indoor air flow into the heat insulated space of second evaporator; second venting fan is operating at the speed based on the temperature difference measured by outdoor temperature sensor and second temperature sensor; at the beginning of the defrosting process, second venting fan is running slowly to vent the cold air, allowing the indoor air to flow into the heat insulated space of second evaporator; the control logic circuit compares the outdoor temperature and the temperature within the insulated space associated with second evaporator, when the temperature measured by second temperature sensor is higher than the outdoor temperature, second venting fan will run slowly or stop running to prevent the heat from escaping into the open air through cold-air-exit duct.
During the defrosting process of the second evaporator, first evaporator continues to operate to absorb heat from the ambient air flow so that main condenser can maintain the temperature within the indoor space;
During the second stage defrosting of each evaporator, each indoor-air-intake fan is drawing the indoor air into its associated evaporator, and the outdoor air is drawing into the indoor space through other ventilation duct for ventilation purpose, or an indoor ventilation fan can co-work with this system and draws outdoor air into the indoor area during the second stage defrosting of each evaporator.
6. A cross anti-freeze-fluid-defrosting heat pump system comprising:
a) Main compressor for pumping and pressurizing the refrigerant into main condenser, b) Refrigerant-to-fluid heat exchanger for transferring the heat energy into the anti-freeze fluid flow circulation, c) First anti-freeze-fluid-defrost evaporator consisting of one refrigerant flow passage and one anti-freeze-fluid passage, d) Second anti-freeze-fluid-defrost evaporator consisting of one refrigerant flow passage and one anti-freeze-fluid passage, e) One expansion valve for regulating the refrigerant pressure drop between main condenser and the refrigerant flow passage of both said anti-freeze-fluid-defrost evaporators, f) First control valve for controlling the refrigerant flow in the refrigerant flow passage of first anti-freeze-fluid-defrost evaporator, g) Second control valve for controlling the refrigerant flow in the refrigerant flow passage of second anti-freeze-fluid-defrost evaporator, h) First fluid pump for controlling and generating the anti-freeze fluid flow through the anti-freeze fluid passage of first anti-freeze-fluid-defrost evaporator, i) Second fluid pump for controlling and generating the anti-freeze fluid flow through the anti-freeze fluid passage of second anti-freeze-fluid-defrost evaporator, j) First venting fan for controlling the air flow through the separated space of first anti-freeze-fluid-defrost evaporator, k) Second venting fan for controlling the air flow through the separated space of second anti-freeze-fluid-defrost evaporator, j) the logic control circuit and the environment temperature sensor for detecting the frost condition and controlling the defrosting process;
When the system is working under the environment temperature that does not require defrosting, first fluid pump and second fluid pump are not operating so that refrigerant-to-fluid heat exchanger does not dissipate any heat energy, the refrigerant is pressurized in main compressor and flows through main condenser to release heat, then the refrigerant flows through expansion valve into first anti-freeze-fluid-defrost evaporator and second anti-freeze-fluid-defrost evaporator, then the refrigerant is evaporated and drawn back to compressor;
When first anti-freeze-fluid-defrost evaporator is defrosting with the first stage defrosting method, first control valve is closed to stop refrigerant flow in first anti-freeze-fluid-defrost evaporator, and then first venting fan is running at full capacity to defrost first evaporator with the ambient air flow;
When second anti-freeze-fluid-defrost evaporator is defrosting with the first stage defrosting method, second control valve is closed to stop refrigerant flow in second anti-freeze-fluid-defrost evaporator, and then second venting fan is running at full capacity to defrost second anti-freeze-fluid- defrost evaporator with the ambient air flow;
When first anti-freeze-fluid-defrost evaporator is defrosting with the second stage defrosting method, first control valve is closed to stop refrigerant flow in first anti-freeze-fluid-defrost evaporator, first fluid pump is pumping to generate the anti-freeze fluid flow which transfers the heat from refrigerant-to-fluid heat exchanger to first anti-freeze-fluid-defrost evaporator, therefore, the system can defrost with the heat energy generated from main compressor and the heat energy absorbed by the other operating anti-freeze-fluid-defrost evaporator; first venting fan decreases speed or stops running to prevent heat from escaping out of the separated space of first anti-freeze-fluid-defrost evaporator;
When second anti-freeze-fluid-defrost evaporator is defrosting with the second stage defrosting method, second control valve is closed to stop refrigerant flow in second anti-freeze-fluid-defrost evaporator, second fluid pump is pumping to generate the anti-freeze fluid flow which transfers the heat from refrigerant-to-fluid heat exchanger to second anti-freeze-fluid-defrost evaporator, therefore, the system can defrost with the heat energy generated from main compressor and the heat energy absorbed by the other operating anti-freeze-fluid-defrost evaporator, second venting fan decreases speed or stops running to prevent heat from escaping out of the separated space of second anti-freeze-fluid-defrost evaporator;
During the second stage defrosting, each defrosting anti-freeze-fluid-defrost evaporator is heated up by the heat energy absorbed by the functioning anti-freeze-fluid-defrost evaporator and the heat energy generated by main compressor.
a) Main compressor for pumping and pressurizing the refrigerant into main condenser, b) Refrigerant-to-fluid heat exchanger for transferring the heat energy into the anti-freeze fluid flow circulation, c) First anti-freeze-fluid-defrost evaporator consisting of one refrigerant flow passage and one anti-freeze-fluid passage, d) Second anti-freeze-fluid-defrost evaporator consisting of one refrigerant flow passage and one anti-freeze-fluid passage, e) One expansion valve for regulating the refrigerant pressure drop between main condenser and the refrigerant flow passage of both said anti-freeze-fluid-defrost evaporators, f) First control valve for controlling the refrigerant flow in the refrigerant flow passage of first anti-freeze-fluid-defrost evaporator, g) Second control valve for controlling the refrigerant flow in the refrigerant flow passage of second anti-freeze-fluid-defrost evaporator, h) First fluid pump for controlling and generating the anti-freeze fluid flow through the anti-freeze fluid passage of first anti-freeze-fluid-defrost evaporator, i) Second fluid pump for controlling and generating the anti-freeze fluid flow through the anti-freeze fluid passage of second anti-freeze-fluid-defrost evaporator, j) First venting fan for controlling the air flow through the separated space of first anti-freeze-fluid-defrost evaporator, k) Second venting fan for controlling the air flow through the separated space of second anti-freeze-fluid-defrost evaporator, j) the logic control circuit and the environment temperature sensor for detecting the frost condition and controlling the defrosting process;
When the system is working under the environment temperature that does not require defrosting, first fluid pump and second fluid pump are not operating so that refrigerant-to-fluid heat exchanger does not dissipate any heat energy, the refrigerant is pressurized in main compressor and flows through main condenser to release heat, then the refrigerant flows through expansion valve into first anti-freeze-fluid-defrost evaporator and second anti-freeze-fluid-defrost evaporator, then the refrigerant is evaporated and drawn back to compressor;
When first anti-freeze-fluid-defrost evaporator is defrosting with the first stage defrosting method, first control valve is closed to stop refrigerant flow in first anti-freeze-fluid-defrost evaporator, and then first venting fan is running at full capacity to defrost first evaporator with the ambient air flow;
When second anti-freeze-fluid-defrost evaporator is defrosting with the first stage defrosting method, second control valve is closed to stop refrigerant flow in second anti-freeze-fluid-defrost evaporator, and then second venting fan is running at full capacity to defrost second anti-freeze-fluid- defrost evaporator with the ambient air flow;
When first anti-freeze-fluid-defrost evaporator is defrosting with the second stage defrosting method, first control valve is closed to stop refrigerant flow in first anti-freeze-fluid-defrost evaporator, first fluid pump is pumping to generate the anti-freeze fluid flow which transfers the heat from refrigerant-to-fluid heat exchanger to first anti-freeze-fluid-defrost evaporator, therefore, the system can defrost with the heat energy generated from main compressor and the heat energy absorbed by the other operating anti-freeze-fluid-defrost evaporator; first venting fan decreases speed or stops running to prevent heat from escaping out of the separated space of first anti-freeze-fluid-defrost evaporator;
When second anti-freeze-fluid-defrost evaporator is defrosting with the second stage defrosting method, second control valve is closed to stop refrigerant flow in second anti-freeze-fluid-defrost evaporator, second fluid pump is pumping to generate the anti-freeze fluid flow which transfers the heat from refrigerant-to-fluid heat exchanger to second anti-freeze-fluid-defrost evaporator, therefore, the system can defrost with the heat energy generated from main compressor and the heat energy absorbed by the other operating anti-freeze-fluid-defrost evaporator, second venting fan decreases speed or stops running to prevent heat from escaping out of the separated space of second anti-freeze-fluid-defrost evaporator;
During the second stage defrosting, each defrosting anti-freeze-fluid-defrost evaporator is heated up by the heat energy absorbed by the functioning anti-freeze-fluid-defrost evaporator and the heat energy generated by main compressor.
7. A cross defrosting heat pump with self-ventilation and humidity control system as defined in Claim 5, wherein the control logic further comprises a forced-ventilation operation control method, wherein each indoor-air-intake control valve is open and its associated indoor-air-intake fan is running to draw in the indoor air for ventilation purpose during the operation of its associated evaporator; under this operation mode, the outdoor air flow is mixed with the indoor air flow through each indoor-air-intake control valve; by controlling the temperature of this mixed air flow, the time required for each defrosting process can be greatly reduced, or under some conditions, the system can continue to operate without defrosting; in the case when the outdoor temperature is between 5 to 12 degree Celsius, the temperature of the mixed air flow can be raised to 12 degree so that the system can greatly increase the operation time of both first evaporator and second evaporator before the first stage defrosting is required; if the temperature of the mixed air flow is raised to above12 degree, the system can operate without defrosting. If the outdoor temperature is below 5 degree, raising the temperature of the mixed air flow can also greatly increase the operation time of both first evaporator and second evaporator before the second stage defrosting is required;
the temperature of the mixed air flow can be controlled by each indoor-air-intake control valve, the operation speed of each venting fan and indoor-air-intake fan; under this operation mode, the venting fans are operating at the speed based on the ventilation rate required or the temperature of the mixed air flow required.
the temperature of the mixed air flow can be controlled by each indoor-air-intake control valve, the operation speed of each venting fan and indoor-air-intake fan; under this operation mode, the venting fans are operating at the speed based on the ventilation rate required or the temperature of the mixed air flow required.
8. A cross reverses defrosting heat pump system as defined in Claim 1, wherein each reverse-flow control valve and its associated upper-flow control valve can be substituted with a rotary upper-flow control valve capable of same functions; each lower-flow control valve and its associated one-way valve can be substituted with a rotary lower-flow control valve capable of same functions.
9. A cross reverses defrosting heat pump system as defined in Claim 1 further comprising:
a) a pressure-boost jet pump connecting its input side from the refrigerant outlet of said main compressor and its output side to the inlet of said main compressor, b) a pressure-boost control valve for controlling the amount of the refrigerant flow through said pressure-boost jet pump;
The pressure-boost jet pump utilizes the high refrigerant pressure from the outlet of said main compressor to adjust the intake refrigerant pressure of the said main compressor for optimum load.
a) a pressure-boost jet pump connecting its input side from the refrigerant outlet of said main compressor and its output side to the inlet of said main compressor, b) a pressure-boost control valve for controlling the amount of the refrigerant flow through said pressure-boost jet pump;
The pressure-boost jet pump utilizes the high refrigerant pressure from the outlet of said main compressor to adjust the intake refrigerant pressure of the said main compressor for optimum load.
10. A cross reverses defrosting heat pump system as defined in Claim 9, wherein the said pressure-boost jet pump can be other mechanical turbo intake devices or a rotary pump.
11. A cross defrosting heat pump system as defined in Claim 2 further comprising:
a) a pressure-boost jet pump connecting its input side from the refrigerant outlet of said main compressor and its output side to the inlet of said main compressor, b) a pressure-boost control valve for controlling the amount of the refrigerant flow through said pressure-boost jet pump;
The pressure-boost jet pump utilizes the high refrigerant pressure from the outlet of said main compressor to adjust the intake refrigerant pressure of the said main compressor for optimum load.
a) a pressure-boost jet pump connecting its input side from the refrigerant outlet of said main compressor and its output side to the inlet of said main compressor, b) a pressure-boost control valve for controlling the amount of the refrigerant flow through said pressure-boost jet pump;
The pressure-boost jet pump utilizes the high refrigerant pressure from the outlet of said main compressor to adjust the intake refrigerant pressure of the said main compressor for optimum load.
12. A cross reverses defrosting heat pump system as defined in Claim 11, wherein the said pressure--boost jet pump can be other mechanical turbo intake devices or a rotary pump.
13. A cross defrosting heat pump with separate refrigerant circulation as defined in Claim 3 further comprising:
a) a pressure-boost jet pump connecting its input side from the refrigerant outlet of each compressor and its output side to the inlet of each compressor, b) a pressure-boost control valve for controlling the amount of the refrigerant flow through said pressure-boost jet pump;
The pressure-boost jet pump utilizes the high refrigerant pressure from the outlet of each compressor to adjust the intake refrigerant pressure of each compressor for optimum load.
a) a pressure-boost jet pump connecting its input side from the refrigerant outlet of each compressor and its output side to the inlet of each compressor, b) a pressure-boost control valve for controlling the amount of the refrigerant flow through said pressure-boost jet pump;
The pressure-boost jet pump utilizes the high refrigerant pressure from the outlet of each compressor to adjust the intake refrigerant pressure of each compressor for optimum load.
14. A cross defrosting heat pump with separate refrigerant circulation Claim 13, wherein the said pressure-boost jet pump can be other mechanical turbo intake devices or a rotary pump.
15. A cross defrosting heat pump with self-ventilation and humidity control system as defined in Claim 5 further comprising:
a) one pressure-boost jet pump connecting its input side from the refrigerant outlet of said main compressor and its output side to the inlet of said main compressor, b) a pressure-boost control valve for controlling the amount of the refrigerant flow through said pressure-boost jet pump;
The pressure-boost jet pump utilizes the high refrigerant pressure from the outlet of said main compressor to adjust the intake refrigerant pressure of said main compressor for optimum load.
a) one pressure-boost jet pump connecting its input side from the refrigerant outlet of said main compressor and its output side to the inlet of said main compressor, b) a pressure-boost control valve for controlling the amount of the refrigerant flow through said pressure-boost jet pump;
The pressure-boost jet pump utilizes the high refrigerant pressure from the outlet of said main compressor to adjust the intake refrigerant pressure of said main compressor for optimum load.
16 A cross defrosting heat pump with separate refrigerant circulation as defined in Claim 5, wherein the said pressure-boost jet pump can be other mechanical turbo intake devices or a rotary pump.
17. A cross anti-freeze-fluid-defrosting heat pump system as defined in Claim 6 further comprising:
a) one pressure-boost jet pump connecting its input side from the refrigerant outlet of said main compressor and its output side to the inlet of said main compressor, b) a pressure-boost control valve for controlling the amount of the refrigerant flow through said pressure-boost jet pump;
The pressure-boost jet pump utilizes the high refrigerant pressure from the outlet of said main compressor to adjust the intake refrigerant pressure of said main compressor for optimum load.
a) one pressure-boost jet pump connecting its input side from the refrigerant outlet of said main compressor and its output side to the inlet of said main compressor, b) a pressure-boost control valve for controlling the amount of the refrigerant flow through said pressure-boost jet pump;
The pressure-boost jet pump utilizes the high refrigerant pressure from the outlet of said main compressor to adjust the intake refrigerant pressure of said main compressor for optimum load.
18. A cross anti-freeze-fluid-defrosting heat pump system as defined in Claim 17, wherein the said pressure-boost jet pump can be other mechanical turbo intake devices or a rotary pump.
19. A cross reverses defrosting heat pump system as defined in Claim 1 further comprising:
at least one additional set of evaporator and the control valves required for cross reverse defrosting;
when a evaporator is defrosting with the second stage defrosting method, all other operating evaporators continues to absorb heat from the environment to provide the energy for heating and defrosting purpose.
at least one additional set of evaporator and the control valves required for cross reverse defrosting;
when a evaporator is defrosting with the second stage defrosting method, all other operating evaporators continues to absorb heat from the environment to provide the energy for heating and defrosting purpose.
20. A cross defrosting heat pump system as defined in Claim 2 further comprising:
at least one additional set of evaporator and defrost condenser and the control valves required for cross defrosting;
when a evaporator is defrosting with the second stage defrosting method, all other operating evaporators continues to absorb heat from the environment to provide the energy for heating and defrosting purpose.
at least one additional set of evaporator and defrost condenser and the control valves required for cross defrosting;
when a evaporator is defrosting with the second stage defrosting method, all other operating evaporators continues to absorb heat from the environment to provide the energy for heating and defrosting purpose.
21. A cross anti-freeze-fluid-defrosting heat pump system as defined in Claim 6 further comprising:
at least one additional set of anti-freeze-fluid-defrost evaporator and the control valves required for anti-freeze-fluid defrosting method, when an anti-freeze-fluid-defrost evaporator is defrosting, all other operating evaporators continue heating and provide the heat energy to defrost that defrosting anti-freeze-fluid-defrost evaporator with the anti-freeze-fluid flow through said refrigerant-to-fluid heat exchanger.
at least one additional set of anti-freeze-fluid-defrost evaporator and the control valves required for anti-freeze-fluid defrosting method, when an anti-freeze-fluid-defrost evaporator is defrosting, all other operating evaporators continue heating and provide the heat energy to defrost that defrosting anti-freeze-fluid-defrost evaporator with the anti-freeze-fluid flow through said refrigerant-to-fluid heat exchanger.
22. A cross defrosting heat pump with self-ventilation and humidity control system as defined in Claim 5 can further combine the cross reverse defrosting heat pump as defined in Claim 1 to increase the efficiency of the second stage defrosting method; when the system is defrosting with the second stage defrosting method, the defrosting evaporator is defrosting with the indoor air flow and the hot refrigerant flow directly from said main compressor.
23. A cross defrosting heat pump with self-ventilation and humidity control system as defined in Claim 5 can further combine with the cross defrosting heat pump as defined in Claim 2 to increase the efficiency of the second stage defrosting method; when the system is defrosting with the second stage defrosting method, the defrosting evaporator is defrosting with the indoor air flow and the heat dissipated from its associated defrost condenser.
24. A cross defrosting heat pump with self-ventilation and humidity control system as defined in Claim 5 can further combine with the cross anti-freeze-fluid-defrosting heat pump system as defined in Claim 6 to increase the efficiency of the second stage defrosting method;
when the system is defrosting the second stage defrosting method, the defrosting anti-freeze-fluid-defrost evaporator is defrosting with the indoor air flow and said anti-freeze-fluid flow.
when the system is defrosting the second stage defrosting method, the defrosting anti-freeze-fluid-defrost evaporator is defrosting with the indoor air flow and said anti-freeze-fluid flow.
25. A cross defrosting heat pump with self-ventilation and humidity control system as defined in Claim 5 can further combine with the cross defrosting heat pump with separate refrigerant circulation as defined in Claim 3 to increase the efficiency of the second stage defrosting method;
when the system is defrosting with the second stage defrosting method, the defrosting evaporator is defrosting with the indoor air flow and the heat dissipated from its associated defrost condenser in contact.
when the system is defrosting with the second stage defrosting method, the defrosting evaporator is defrosting with the indoor air flow and the heat dissipated from its associated defrost condenser in contact.
26. The cross reverse defrosting heat pump system as defined in Claim 1, and the cross defrosting heat pump system as defined in Claim 2, and the cross defrosting heat pump with self-ventilation and humidity control system as defined in Claim 6, and the cross defrosting heat pump with separate refrigerant circulation as defined in Claim 3, and the cross anti-freeze-fluid-defrosting heat pump system as defined in Claim 6 comprises a control logic which employs the first stage defrosting method under the environment temperature ranged from 12 degree to 5 degree Celsius.
27. The cross reverse defrosting heat pump system as defined in Claim 1, and the cross defrosting heat pump system as defined in Claim 2, and the cross defrosting heat pump with self-ventilation and humidity control system as defined in Claim6, and the cross defrosting heat pump with separate refrigerant circulation as defined in Claim 3, and the cross anti-freeze-fluid-defrosting heat pump system as defined in Claim 6 comprises a control logic which employs the second stage defrosting method under the environment temperature of 5 degree Celsius and lower.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2530567 CA2530567C (en) | 2005-12-16 | 2005-12-16 | Multi-range cross defrosting heat pump system |
| CA2672747A CA2672747C (en) | 2005-12-16 | 2005-12-16 | Forced-air cross-defrost type air-conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2530567 CA2530567C (en) | 2005-12-16 | 2005-12-16 | Multi-range cross defrosting heat pump system |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2672747A Division CA2672747C (en) | 2005-12-16 | 2005-12-16 | Forced-air cross-defrost type air-conditioning system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2530567A1 true CA2530567A1 (en) | 2007-06-16 |
| CA2530567C CA2530567C (en) | 2011-10-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2672747A Expired - Fee Related CA2672747C (en) | 2005-12-16 | 2005-12-16 | Forced-air cross-defrost type air-conditioning system |
| CA 2530567 Expired - Fee Related CA2530567C (en) | 2005-12-16 | 2005-12-16 | Multi-range cross defrosting heat pump system |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2672747A Expired - Fee Related CA2672747C (en) | 2005-12-16 | 2005-12-16 | Forced-air cross-defrost type air-conditioning system |
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| CA (2) | CA2672747C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2677252A1 (en) * | 2012-06-22 | 2013-12-25 | LG Electronics, Inc. | Refrigerator |
| EP3124899B1 (en) * | 2015-07-28 | 2019-05-08 | Lg Electronics Inc. | Refrigerator |
| EP3584513A1 (en) * | 2018-06-06 | 2019-12-25 | Heatcraft Refrigeration Products LLC | Cooling system |
| CN111121352A (en) * | 2020-01-16 | 2020-05-08 | 天津商业大学 | Continuous defrosting refrigeration control system capable of reducing heat leakage |
| CN112984595A (en) * | 2021-03-10 | 2021-06-18 | 青岛海信日立空调***有限公司 | Ground heating unit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766332B (en) * | 2016-12-20 | 2023-05-30 | 珠海格力电器股份有限公司 | Air conditioning system unit and air conditioning system |
-
2005
- 2005-12-16 CA CA2672747A patent/CA2672747C/en not_active Expired - Fee Related
- 2005-12-16 CA CA 2530567 patent/CA2530567C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2677252A1 (en) * | 2012-06-22 | 2013-12-25 | LG Electronics, Inc. | Refrigerator |
| EP3124899B1 (en) * | 2015-07-28 | 2019-05-08 | Lg Electronics Inc. | Refrigerator |
| US10746444B2 (en) | 2015-07-28 | 2020-08-18 | Lg Electronics Inc. | Refrigerator |
| US11578903B2 (en) | 2015-07-28 | 2023-02-14 | Lg Electronics Inc. | Refrigerator |
| EP3584513A1 (en) * | 2018-06-06 | 2019-12-25 | Heatcraft Refrigeration Products LLC | Cooling system |
| US10808975B2 (en) | 2018-06-06 | 2020-10-20 | Heatcraft Refrigeration Products Llc | Cooling system |
| CN111121352A (en) * | 2020-01-16 | 2020-05-08 | 天津商业大学 | Continuous defrosting refrigeration control system capable of reducing heat leakage |
| CN112984595A (en) * | 2021-03-10 | 2021-06-18 | 青岛海信日立空调***有限公司 | Ground heating unit |
| CN112984595B (en) * | 2021-03-10 | 2022-04-19 | 青岛海信日立空调***有限公司 | Ground heating unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2672747C (en) | 2012-05-15 |
| CA2530567C (en) | 2011-10-18 |
| CA2672747A1 (en) | 2007-06-16 |
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