By J. Macinko, D. B. Chelton, J. Dean (auth.), K. D. Timmerhaus (eds.)
By renowned request, the nationwide Bureau of criteria used to be back a number to a convention on cryogenic engineering on August 19-21, 1957. comparable conferences have been held right here in 1954 and 1956. The recognition of over 40 papers for this convention used to be definitely an indication of the expanding task and curiosity during this engineering box. There turns out no doubt that it'll keep growing, justifying the necessity for annual conferences. To make the lawsuits extra fascinating an try out was once made to incorporate up to attainable of the final dialogue which every one paper. to acquire person reprints of someone specific paper, please touch the authors at once. 1957 CRYOGENIC ENGINEERING convention COMMITTEE B. W. Birmingham nationwide Bureau of criteria S. C. Collins Massachusetts Institute of expertise E. F. Hammel Los Alamos clinical Laboratory R. B. Scott nationwide Bureau of criteria okay. D. Timmerhaus college of Colorado W. T. Ziegler Georgia Institute of expertise i ACKNOWLEDGMENTS The 1957 Cryogenic Engineering convention Committee gratefully recognizes the continuing aid and curiosity of the subsequent enterprises who've made the 1957 Cryogenic Engineering convention and the book of this complaints attainable. L' Air Liquide Air items, Inc. Allison department, basic Motor s American Messer company Aro apparatus company Beech airplane company Bell airplane Boeing aircraft corporation Cambridge company Convair Curtiss-Wright company Garrett company basic electrical corporation Herrick L. Johnston, Inc. Hofman Laboratories Linde corporation A. D. Little, Inc.
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Additional info for Advances in Cryogenic Engineering: Proceedings of the 1957 Cryogenic Engineering Conference, National Bureau of Standards Boulder, Colorado, August 19–21, 1957
This is because in Table IV separation into the actual products has been as sumed for the ideal unit, in order to facilitate direct comparison with the actual rectification system, whereas previously, in comparing the complete cycle, an ideal separation was assumed, giving rise to a higher liquid oxygen yield. Commenting first on the ideal case, since this reveals the nature and extent of the intrinsic irreversible factors present, it will be noted that much of the largest penalty is attributable to the adiabatic nature of the rectification process, even under minimum reflux conditions.
In such calculations allowance would be made for the fact that the ratio of the amount of air passing through the engine to that passing through the final heat exchanger will vary slightly with operating pressure for optimum refrigeration performance. Accurate calculations tend, therefore, to be rather tedious. The specific effect of changes in the surface area can also, however, be derived reasonably accurately from an entropy increment analysis. From a consideration of Table IV, altering the size of the condenser-evaporator and hence the lower column pressure will, in the column system, alter the irreversibility due to temperature difference across the heat transfer surface, and also that due to expansion of the reflux streams from lower to upper column pressure.
This will result in a lower or higher exhaust pres sure from the expansion engine and also after the main expansion valve, and assuming that the expansion engine efficiency remains constant, the pressure of the air delivered by the compressor which is necessary to provide the required amount of refrigeration will vary. The operating pressure required, and hence the effect on power consumption, for any particular condenserevaporator surface area can be derived by the method of trial and error calculations based on heat balances.