By A. A. duPont (auth.), K. D. Timmerhaus (eds.)
The collage of Colorado and the nationwide Bureau of criteria have once more served as hosts for the Cryogenic Engineering convention in Boulder, Colorado. In proposing the papers of this 12th annual assembly, the 1966 Cryogenic Engineering convention Committee has back well-known the superb cooperation which has existed among those firms during the last decade in regards to either cryogenic study and convention job. This cooperation was once confirmed not just on the 1966 Cryogenic Engineering convention but in addition on the foreign Institute of Refrigeration, fee I assembly, which was once additionally hosted by way of those enterprises instantly following the Cryogenic Engineering convention. those conferences have supplied attendees with probably the most accomplished coverages of cryogenic issues that has ever been awarded at one situation. Emphasis on significant overseas advances in helium expertise on the overseas Institute of Refrigeration, fee I assembly has been attainable principally throughout the nationwide technology starting place furnish GK 1116 to the collage of Colorado. The Cryogenic Engineering convention Committee gratefully recognizes this aid as a result of its worthy foreign contribution to the Cryogenic Engineering convention. As some time past, the Cryogenic Engineering convention Committee is thankful for the ongoing tips of all of the committed employees within the cryogenic box who've contributed their time reviewing the initial papers for this system and the ultimate manuscripts for this volume.
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Extra resources for Advances in Cryogenic Engineering: Proceedings of the 1966 Cryogenic Engineering Conference University of Colorado Engineering Research Center and Cryogenics Division NBS Institute for Materials Research Boulder, Colorado June 13–15, 1966
The results showed that it is feasible for storage durations of the order of about 1000 hr. The reversible converter-reliquefier, shown in Fig. 3, operates as follows: the reversible refrigerator reliquefies the saturated parahydrogen vapor by absorbing heat (Qa) from it and rejecting heat (Qb) to the heat sink (converter heat exchanger). The converter absorbs heat (Qb) in the converter heat exchanger and rejects heat to the storage tank. This is accomplished by first heating saturated parahydrogcn vapor (state point 1) in the counterflow heat exchanger and then converting it (state point 2) to a paraorthohydrogen mixture (state point 3) by means of a catalyst in the converter heat exchanger.
Preliminary design of the components required for the simple self-powered cycle shown in Fig. 6 indicate that the expander, compressor, and heat exchanger will weigh approximately 25, 140, and 5 lb, respectively. Allowance of 5 lb for tubing results in a total system weight of 175 lb. 65 37 PSI .. 11 PSIA 43 'R 88 Bruh8 It3 'R -94 Bru/L8 5 31 PSIA 43 'R 88 Bruha SAT, LIQUID -+__________~__-, ~T. V"~P~O~R~~______ 1 La/HR HY~OGEH TAIII Fig. 6. Schematic of self-powered open-loop cycle with direct boil-off heat sink.
1. The maximum sink temperature for a low-altitude earth-orbit radiator is estimated to be about 380o R. Since the sink temperature is greater than the maximum J oule- Thomson inversion temperature of hydrogen, cycles that are wholly dependent upon the Joule-Thomson effect for cooling cannot be used to reliquefy hydrogen. A cycle that is not completely J oule-Thomson-dependent, in that it employs an expander, was selected for closed reliquefaction of hydrogen . The Claude-Heylandt cycle with one stage of compressor intercooling is shown in Fig.
Advances in Cryogenic Engineering: Proceedings of the 1966 Cryogenic Engineering Conference University of Colorado Engineering Research Center and Cryogenics Division NBS Institute for Materials Research Boulder, Colorado June 13–15, 1966 by A. A. duPont (auth.), K. D. Timmerhaus (eds.)