Efficiency of Low-Temperature Expansion Machines
Cryogenic refrigeration processes have shown a vigorous growth in the past decade. Therefore, it seems appropriate to reexamine the criteria whereby the machines responsible for creating the bulk of the refrigeration, i.e., the expansion machines, are compared and selected. The need for doing this is brought about by the increasingly lower working temperatures and the introduction of gas bearings which, if of the externally pressurized type, consume a fair amount of the compressed gas. The lower the operating temperature, the larger may be the irreversible loss due to leakage.
KeywordsHeat Exchanger Expansion Ratio Efficiency Expression Inlet Condition Labyrinth Seal
Unable to display preview. Download preview PDF.
- 1.D. G. Shepherd, Principles of Turbomachinery, Macmillan Company, New York (1956).Google Scholar
- 2.A. J. Stepanoff, Turboblowers, J. Wiley and Sons, New York (1955).Google Scholar
- 3.J. G. Knudsen and D. L. Katz, Fluid Dynamics and Heat Transfer, McGraw-Hill, New York (1958).Google Scholar
- 4.D. M. Church, Chem. Eng. (March 5, 1962).Google Scholar
- 5.P. Kapitza, J. Phys. 1, No. 1 (1939).Google Scholar
- 6.L. F. Scheel, Gas and Air Compression Machinery, McGraw-Hill, New York (1961).Google Scholar
- 7.R. Hilsch, Rev. Sci. Instr. 18, No. 2 (1947).Google Scholar
- 8.S. Ergenc and J. Hänny, “Considerations on the Thermodynamics of Gas Refrigerating Cycles,” Sulzer Technical Rev., No. 4 (1963).Google Scholar