Patent ID: 8209991

Claim:
A method of operating a cooling storage, comprising: a compressor, a condenser, a valve device, a first and a second evaporators, and a throttle device for throttling the refrigerant flowing into each the evaporator, wherein the refrigerant that has been compressed by the compressor and liquified by the condenser is selectively supplied to the first and the second evaporators by the valve device, so that each of a first and a second storage rooms of varied thermal loads is cooled by the first and the second evaporators, and said method is characterized by calculating and integrating a deviation between a target temperature set for each the first and the second storage room and an actual storage temperature measured in each storage room at every predetermined time, and changing a ratio of refrigerant supply time for each of the first and the second evaporators by controlling the valve device based on the integrated value.