70results about How to "Effective defrosting" patented technology

Provided is a heat-pump-type vehicle air conditioning system that flows hot gas to both an vehicle-cabin-exterior condenser and a vehicle-cabin-exterior vaporizer during a defrosting operation, and that, even during times of low outside air temperatures, can efficiently defrost in a short period of time and can use in a commoditized manner the cooling cycle of an existing system as-is. In the heat-pump-type vehicle air conditioning system (1): a vehicle-cabin-interior condenser (8) disposed downstream of a vehicle-cabin-interior vaporizer (7) within an HVAC unit (2) is connected, with a coolant switching means (16) therebetween, to a cycle (23) for cooling comprising an electric compressor (15), a vehicle-cabin-exterior condenser (17), a first decompression means (19) to which an on-off valve functionality is provided, the vehicle-cabin-interior vaporizer (7), and an accumulator (21); the vehicle-cabin-exterior vaporizer (27) disposed at the outside of the vehicle cabin is connected, with a second decompression means (26) to which an on-off valve functionality is provided therebetwen, to the exit-side liquid coolant tubing (22B) of the vehicle-cabin-exterior condenser (17); and furthermore a bypass circuit (32) having a third decompression means (30) to which an on-off functionality is provided is connected between the accumulator (21) and the exit exit-side liquid coolant tubing (22B) of the vehicle-cabin-exterior condenser (17).

A method for controlling a refrigerator, according to an embodiment of the present invention, comprises: a step in which it is determined whether a period of defrosting (POD) for defrosting a freezing compartment and a deep-freezing compartment has elapsed; a step in which, when it is determined that the period of defrosting has elapsed, a deep cooling operation for cooling at least one from among the temperature of the deep-freezing compartment and the temperature of the freezing compartment to be lower than a control temperature is performed; and a step in which, when the deep cooling operation finishes, a defrosting operation for defrosting the freezing compartment and the deep-freezing compartment is performed. When the defrosting operation starts, a freezing compartment valve is closed so as to prevent cold air from flowing to a freezing compartment evaporator and a heat sink, and at least a portion of a freezing compartment defrosting section and at least a portion of a deep-freezing compartment defrosting section overlap with each other.

A method for controlling a refrigerator according to an embodiment of the present invention is characterized by comprising: a step for determining whether a defrosting period (POD) for defrosting a freezing chamber and a deep freezing chamber has elapsed; a step for, when it is determined that the defrosting period has elapsed, performing a deep cooling operation for bringing at least one among the temperature of the deep freezing chamber and the temperature of the freezing chamber down to a temperature lower than a control temperature; and a step for defrosting the deep freezing chamber when the deep cooling operation is terminated, wherein, when the defrosting of the deep freezing chamber is started, a freezing chamber valve is closed to block cold air flow to a heat sink, the defrosting of the deep freezing chamber includes cold sink defrosting and heat sink defrosting performed after the cold sink defrosting is completed, and while the heat sink defrosting is being performed, a deep freezing chamber fan is driven to remove water vapor generated during the cold sink defrosting.