Patent ID: 6698212
Filing Date: 2004-03-02
Classification: B60H,F17C,F25D,G05D

Abstract:
A cryogenic temperature control apparatus operable in a cooling mode, the cryogenic temperature control apparatus comprising:a storage tank housing a quantity of cryogen; a housing defining a conditioned space; a heat exchanger in thermal communication with the conditioned space; a first flow path fluidly connecting the storage tank and the heat exchanger; a first valve positioned along the first flow path between the storage tank and the heat exchanger, the first valve having a first open position, in which cryogen is moveable along the first flow path between the storage tank and the heat exchanger, and a first closed position, in which the first valve fluidly seals the first flow path between the storage tank and the heat exchanger, the first valve being in the first open position during operation in the cooling mode to accommodate movement of cryogen along the first flow path; a second flow path fluidly connecting the storage tank and the heat exchanger; and a second valve positioned along the second flow path between the storage tank and the heat exchanger, the second valve having a second open position, in which cryogen is moveable along the second flow path between the storage tank and the second heat exchanger, and a second closed position, in which the second valve fluidly seals the second flow path between the storage tank and the heat exchanger, the second valve being in the second open position during operation in the cooling mode to accommodate movement of cryogen along the first flow path.