Abstract
Compressors are required in cryogenic refrigeration systems for two distinct purposes: as part of the thermodynamic cycle of a liquefier or refrigerator, and as a means of storing a gas at room temperature; sometimes these functions can be performed by the same machine. The thermodynamic necessity for a compressor has already been made clear by implication in the last chapter. It is not merely there to push the working substance round the system, but in an internal-work system to raise the pressure of the working substance to a value such that at the precooling temperature the enthalpy is smaller than that at atmospheric pressure to the extent required to give the desired performance. In an external-work system the function of the compressor is to reduce the entropy — in this role Simon referred to compressors as “entropy squeezers.”
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References
Croft, A. J., Cryogenics 4, 143 (1964).
Rietdijk, J. A., van Beukering, H. C. J., van der Aa, H. H. M, and Meijer, R. J., Philips Tech. Rev. 26, 10 (1965).
White, F. G., Industrial Air Compressors, Foulis, London, 1967.
Yarwood, J., High Vacuum Technique, Chapman & Hall, 4th edition, 1967.
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© 1970 Springer Science+Business Media New York
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Croft, A.J. (1970). Room-Temperature Machinery. In: Cryogenic Laboratory Equipment. The International Cryogenics Monograph Series. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-4893-2_4
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DOI: https://doi.org/10.1007/978-1-4757-4893-2_4
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