Patent ID: 9739519
Date: 2017-08-22
CPC Classifications: F25B,F25D,Y02B

Claim:
1. A refrigeration system comprising: a compressor having a first stage and a second stage; a heat rejecting heat exchanger having a fan drawing ambient fluid over the heat rejecting heat exchanger, the heat rejecting heat exchanger including an intercooler and a gas cooler, the intercooler coupled to an outlet of the first stage and the gas cooler coupled to an outlet of the second stage; an unload valve coupled to an outlet of the intercooler and a suction port of the first stage; a flash tank coupled to an outlet of the gas cooler; a primary expansion device coupled to an outlet of the flash tank; a heat absorbing heat exchanger coupled to an outlet of the primary expansion device, an outlet of the heat absorbing heat exchanger coupled to the suction port of the first stage; and a controller configured to execute a startup process including the controller configured to control the fan speed to reduce refrigerant heat loss in the heat rejecting heat exchanger; wherein controlling the fan speed in the startup process includes the controller configured to control fan speed in response to superheat, wherein the fan speed is proportional to the superheat.