Patent ID: 7614249
Filing Date: 2009-11-10
Classification: F25B

Abstract:
1. A multi-range cross-reverse air-conditioning system comprising: a) a main refrigeration circuit for the air-conditioning, said main refrigeration circuit consisting a main compressor for pressurizing refrigerant, a main condenser for condensing refrigerant and releasing heat, at least two evaporators for evaporating refrigerant and absorbing heat energy, a main expansion valve for regulating the refrigerant pressure difference between said main condenser and said two evaporators; b) each of said two evaporators including flow control means for disabling the evaporation process individually by blocking the refrigerant passage from said main expansion valve; c) each of said two evaporators including flow control means for providing a refrigerant passage from said main compressor to said two evaporators individually; d) each of said two evaporators including a heat insulated space, and said heat insulated space including individual outdoor-air-intake means and indoor-air-intake means; e) a control system for selecting defrosting methods and controlling all said flow control means and outdoor-air-intake means and indoor-air-intake means; f) during the full capacity heating operation, all said evaporators will operate with the evaporation process by receiving the refrigerant-flow from said main expansion valve, while all refrigerant passages from said main compressor to each evaporator will be blocked to disable the refrigerant-flow associated with the high speed cross-reverse defrosting process, a controlled flow of outdoor air is admitted into the heat insulated space of each evaporator by its associated outdoor-air-intake means, meanwhile all said indoor-air-intake means are disabled to block the air passage between the indoor space and the heat insulated space of each evaporator; g) said multi-range cross-reverse air-conditioning system is capable of defrosting each evaporator by a defrost-cycle of the high speed cross-reverse defrosting process, wherein each of said evaporator will alternately operate with the high speed cross-reverse defrosting process and the refrigerant evaporation process; h) during the high speed cross-reverse defrosting process of each evaporator, said outdoor-air-intake means will stop inhaling outdoor air into the heat insulated space of the evaporator that is defrosting, a controlled flow of indoor air will be transferred into the heat insulated space of the evaporator that is defrosting, and at the same time a controlled amount of the pressurized refrigerant will be distributed into the evaporator that is defrosting, the accumulated frost on said evaporator will be melted by the heat generated from the condensation process therein and the heat energy of the indoor air, therefore the indoor air will be ventilated during this process, the other evaporator will continue the evaporation process with a flow of outdoor air, the main compressor and the main condenser will continue their operation to generate the heat energy for the air-conditioning; i) during the high speed cross-reverse defrosting process of each evaporator, the evaporator that is defrosting with the high speed cross-reverse defrosting process will receive a flow of pressurized refrigerant from said main compressor, and said flow of pressurized refrigerant will condense in said defrosting evaporator and exit via its associated pressure regulating means into the other evaporator that is operating with the evaporation process.