Refrigeration – Refrigeration producer – Evaporator – e.g. – heat exchanger
Patent
1987-04-28
1988-07-12
Capossela, Ronald C.
Refrigeration
Refrigeration producer
Evaporator, e.g., heat exchanger
62 54, 165133, F25B 1900
Patent
active
047561670
ABSTRACT:
A helium cooling apparatus according to the present invention comprises a refrigerator for cooling a refrigerant. The refrigerator is connected with the proximal end of a transfer line, which is used to transport the refrigerant. A port with a predetermined diameter is formed in a liquid-helium container which contains liquid helium. A condensation-heat exchanger, which is connected to the distal end of the transfer line, is inserted into the liquid-helium container through the port. A heat-transfer surface of the heat exchanger is formed with a plurality of grooves extending in the gravitational direction. The refrigerant is evaporated in the heat exchanger, and condensed liquid helium, adhering to the heat-transfer surface, drops along the grooves when helium gas in the liquid-helium container is cooled to be recondensed. Accordingly, the heat-transfer surface cannot be covered with the condensed liquid helium, so that a wide heat-transfer area can be secured. Thus, the heat transfer coefficient of the heat exchanger is improved considerably. In this arrangement, therefore, the port of the liquid-helium container, through which the exchanger is inserted into the container, need not have a large diameter.
REFERENCES:
patent: 2831549 (1958-04-01), Alpert
patent: 4159739 (1979-07-01), Brothers et al.
patent: 4543794 (1985-10-01), Matsutani et al.
patent: 4599866 (1986-07-01), Nakagome et al.
Transaction of the ASME, vol. 103, (1981), pp. 96-102, "Optimized Performance of Condensers With Outside Condensing Surface", Y. Mori, et al.
Cryogenics, Apr. 1984, "Interfacing Small Closed-Cycle Refrigerators to Liquid Helium Cryostats", R. C. Longsworth.
Kuriyama Toru
Nakagome Hideki
Capossela Ronald C.
Kabushiki Kaisha Toshiba
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