Patent ID: 6257007
Filing Date: 2001-07-10
Classification: F25B,Y02B

Abstract:
A variable capacity, compression type cooling system comprising:a heat absorbing circuit (302);a heat rejection circuit coupled to the heat absorbing circuit for rejecting into the environment at least a portion of heat absorbed by the heat absorbing circuit;the heat rejection circuit including:a compressor (310) and a motor (309) connected for driving the compressor;a first variable-frequency drive circuit (308) coupled to the compressor motor;an air cooled condenser (320);a variable-speed fan (334) for driving air over the air cooled condenser;a second variable-frequency drive circuit (335) for powering the fan motor;means for determining a present load (316) on the cooling; andmeans for controlling (317) the second variable-frequency drive circuit (335) in response to the present load on the cooling system so as to regulate operation of the variable-speed fan in response to the load on the compressor.