EFFECT OF MEDIUM TEMPERATURE ON THE CHARACTERISTICS OF CLOSED CRYOGENIC SYSTEMS.

The author has analyzed the effect of medium temperature on the characteristics of a gaseous, cryogenic system consisting of an engine driven by compressed gas with a regenerator in the dead space and piston-drive compressor. The following basic assumptions were made: the working body is an ideal gas; the temperature of the gas in the pressure and suction lines is equal to the temperature of the medium T//m; the compressor is isothermal with a constant supply factor lambda ; the compartment housing the air-driven engine is isothermal, and the gas in it assumes the cryostating temperature T//o; the dead space of the air-driven engine is equal to zero. Analyzing the relationships the author concludes that having determined the relationship between the total losses and the temperature of the medium in the volume being cryostated by experimental or computational means, it is possible to select a volume ratio for the pressure and suction lines so as to reduce significantly the effect of medium temperature on the useful cold production of the system. It should also be noted that this conclusion is also valid for closed throttling systems when the mass of the working gas is constant and the volume ratios can be varied.