| abstract |
A high efficiency condenser, in one embodiment, includes a phase change material in thermal contact with the condenser to assist in cooling the condenser during operation and particularly during pull-down operation to improve the cooling capacity of a compressor. In a preferred embodiment of such a system, a coaxial tube carrying the refrigerant through the condenser includes an inner conduit for the refrigerant and a coaxially arranged outer jacket with phase change material for extracting heat from the compressed refrigerant. In another embodiment, a secondary condenser is provided in a secondary coolant circuit and is in thermal contact with the primary condenser. Variable speed fans are associated with the condenser(s) and can be operated in the high speed (turbo) mode during pull-down of a refrigeration system for providing sufficient cooling capacity during a pull-down mode of operation. |