Patent ID: 8538585

Claim:
A method for operating a refrigeration system for a container to pull down the temperature of cargo from ambient to a predetermined set-point temperature, the method comprising: operating a compressor of the refrigeration system at a first power to compress a refrigerant and direct the refrigerant through a condenser and an evaporator of the refrigeration system, wherein the compressor, condenser, and evaporator are connected in series; initially operating an evaporator fan at a first speed to supply refrigerated supply air from the evaporator to the cargo within the container when the cargo is at ambient temperature; sensing the temperature of the supply air; comparing the temperature of the supply air with the predetermined set-point temperature; increasing the speed of the evaporator fan to a second speed faster than the first speed when the temperature of the supply air is lower than the predetermined set-point temperature to maintain the temperature of the supply air at the predetermined set-point temperature; and decreasing the speed of the evaporator fan from the second speed to a third speed slower than the second speed when the temperature of the supply air is higher than the predetermined set-point temperature while the compressor is operating to maintain the temperature of the supply air at the predetermined set-point temperature.