Application to the thermal of the existence of thermal waves propagating with a determined in the gas.

摘要

1,149,407. Refrigerating. SOC. POUR L'UTILISATION RATIONNELLE DES FLUIDES. 8 July, 1966 [8 July, 1965], No. 30901/66. Heading F4H. [Also in Division F1] A refrigerating system employing gaseous helium or nitrogen as the working fluid comprises a single or two-stage compressor 31 (see Division F1) in which the gas is compressed with an initial acceleration of not less than 200g resulting in a maximum compression velocity at least 100 times greater than the thermic wave front velocity of the gas. The compressor supplies an expansion cylinder-piston device or turbine 52 and the output therefrom is admitted to a cooler 33. The compressor 31 is driven by a crank 42 supplied with power by a motor 51 and from the expansion turbine 52 through a reduction gear 38.