Patent ID: 8051669

Claim:
A liquid evaporation cooling apparatus comprising: an evaporator for boiling and evaporating an evaporable liquid under a lower pressure than a pressure of the air; a condenser for condensing vapor generated in the evaporator by a cooling evaporable liquid; an indirect heat exchanger installed at a load side; a cooling heat exchanger using the air as a cooling source; a circulation means for circulating an evaporable liquid in the evaporator to the indirect heat exchanger; and a cooling circulation means for circulating a cooling evaporable liquid in the condenser to the cooling heat exchanger, and further comprising a vapor compressor in a vapor duct extending from the evaporator to the condenser, wherein the vapor duct is provided with a bypass vapor path for bypassing the vapor compressor, and the bypass vapor path is provided with an on-off valve, such that the vapor compressor is shut down and the on-off valve is opened when a temperature at the condenser side becomes lower than a temperature at the evaporator side, wherein opening of the on-off valve is controlled in accordance with a temperature at the condenser side or a temperature at the evaporator side, such that a degree of the opening is decreased with a drop in the temperature and is increased with a rise in the temperature.