Advances in Cryogenic Engineering: A Collection of Invited by T. M. Flynn, C. N. Smith (auth.), K. D. Timmerhaus (eds.) PDF

By T. M. Flynn, C. N. Smith (auth.), K. D. Timmerhaus (eds.)

ISBN-10: 1468478265

ISBN-13: 9781468478266

ISBN-10: 1468478281

ISBN-13: 9781468478280

1971 marked the 1st yr when you consider that 1956 that the once a year Cryogenic Engineering convention was once now not held. in its place, the Cryogenic Engineering convention gave its complete aid to the XIII overseas Congress of Refrigeration via operating with Commissions I and II of the overseas Institute of Refrigeration to prepare the cryogenic periods for those commissions. the entire papers awarded on the foreign Congress of Refrigeration may be released by way of the IIR as a part of the lawsuits of that assembly. although no Cryogenic Engineering convention was once held in 1971, it grew to become relatively obtrusive to the convention Board that there have been adequate advances in cryogenic engineering to warrant the e-book of quantity 17 of the Advances in Cryogenic Engineering. quantity 17 offers the advances during this very important box through bringing jointly in a single quantity a number of the major papers which were provided at quite a few technical conferences around the state in the course of the latter half 1970 and the 1st a part of 1971. moreover, a number of authoritative assessment papers were ready by means of invitation of the Cryogenic Engineering convention Board.

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Additional resources for Advances in Cryogenic Engineering: A Collection of Invited Papers and Contributed Papers Presented at National Technical Meetings During 1970 and 1971

Sample text

These various components may be used to cool the feed stream in the mixed refrigerant cascade system without using separate cooling circuits for the refrigerants by carefully controlling the composition of the cycle gas mixture. This allows the use of a single compressor for the recirculating gases, instead of a separate compressor for the different streams, as in the case for the ordinary cascade system. The number of heat exchangers is also smaller for the MRC system than for the basic cascade system.

Work per unit mass liquefied for the Linde dualpressure system. The work requirement per unit mass liquefied in the Linde dual-pressure system is given by mf yryo (10) The work requirement for the two compressors is smaller than for the basic system by the second bracketed term in (10). The net result is that the work required to liquefy a unit mass of cryogen is smaller for the dual-pressure system compared with the basic Linde-Hampson system. The dual-pressure system cannot be used for hydrogen, neon, or helium.

For a given high pressure in the system, there is an optimum value of the expander mass flow rate ratio which minimizes the system work requirement. As the maximum system pressure is increased, the minimum work requirement is decreased. Since the Claude system does not depend primarily upon the expansion valve to produce low temperatures, it may be used for hydrogen and neon liquefaction without modification. The performance is improved, however, if a liquid-nitrogen precooling bath is used. The Collins liquefaction system for production of liquid helium is an extension of the Claude system, in which two or more expanders are used, instead of the single expander in the basic Claude system.

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Advances in Cryogenic Engineering: A Collection of Invited Papers and Contributed Papers Presented at National Technical Meetings During 1970 and 1971 by T. M. Flynn, C. N. Smith (auth.), K. D. Timmerhaus (eds.)


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