Patent ID: 7937962
Filing Date: 2011-05-10
Classification: F25B,F25D

Abstract:
1. A refrigerated transport system comprising: a compressor to supply high pressure refrigerant vapor to a condenser, the compressor coupled to the condenser, the condenser to condense the high pressure vapor to a high pressure liquid; a primary compartment evaporator to accept heat from the air in a primary compartment and to transfer the heat to a refrigerant circulated within the primary compartment evaporator to refrigerate the primary compartment, the primary compartment evaporator coupled to a primary compartment expansion device for receiving low pressure liquid from the primary compartment expansion device, the primary compartment expansion device coupled to the condenser, and a primary refrigerant flow through the primary compartment evaporator is controlled by a controller using a primary compartment temperature feedback from a temperature sensor in the primary compartment to control the temperature in the primary compartment; and at least one secondary compartment evaporator to accept heat from the air in a secondary compartment and to transfer the heat to a refrigerant circulated within the secondary compartment evaporator to refrigerate the secondary compartment, the secondary compartment evaporator coupled to a secondary compartment expansion device for receiving low pressure liquid from the secondary compartment expansion device, the secondary compartment expansion device coupled to the condenser, and a secondary refrigerant flow through the secondary compartment evaporator is controlled by a controller using a secondary compartment temperature feedback from a temperature sensor in the secondary compartment to control the temperature in the secondary compartment and wherein a prioritizing algorithm limits the maximum amount of refrigerant flow available to at least one limited cooling compartment by holding a delta T (difference between the supply air temperature and return air temperature) instead of a setpoint temperature in the at least one limited cooling compartment when the available cooling capacity is insufficient to hold a substantially constant temperature in all compartments.