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Analysis of Integrated Heat Pumps by the “Null Engine” Concept
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English
Abstract
Integrated Heat Pumps have been defined in the literature, but are only available commercially as custom-built units. Of special promise are integrated heat pumps that are based on the Vuilleumier cycle. They are currently investigated intensively for this application. In this paper a generalized configuration is analyzed theoretically where energy input is in the form of thermal energy only and the system can be used either as a heat pump or a refrigerator. Although Vuilleumier machines are taken as the prime example of an integrated heat pump, the same basic treatment is also applicable to other designs. A new concept of a “Null Engine” is introduced here to establish quantitative relationships between engine proportions and operating characteristics. The generalized heat-operated Vuilleumier machine is analyzed from first principles based on the applicable temperature-entropy diagrams. From this a theoretical volume ratio between the cold and the hot expansion space in a Vuilleumier machine is deduced for the first time. The most important result of this analysis is that a theoretical minimum for operational hardware is established which will ensure an energy balance for an ideal integrated heat pump.
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Citation
Finkelstein, T., "Analysis of Integrated Heat Pumps by the “Null Engine” Concept," SAE Technical Paper 929497, 1992, https://doi.org/10.4271/929497.Also In
References
- Roose, T.R. Wurm J. Kinast J. Staats W. “STIRLING AND VUILLEUMIER HEAT PUMPS” McGraw Hill Publishing Co. 1991
- Finkelstein, T. “THERMOCOMPRESSORS, SOLVAY AND VUILLEUMIER MACHINES” Proc. 5th Intersociety Energy Conversion Engineering Conference Las Vegas, Nevada Sep. 20-25 1970
- Schulz, S. Thomas B. “DEVELOPMENT OF A FREE PISTON VUILLEUMIER MACHINE FOR COOLING PURPOSES” Proc. 5th International Stirling Engine Conference Dubrovnik, Croatia 8 - 10 May 1991
- Finkelstein, T. “BALANCED COMPOUNDING OF STIRLING ENGINES” Paper 789194 Proc. 13th Intersociety Energy Conversion Engineering Conference San Diego, California Aug. 20 - 25 1978
- Vuilleumier, R. “METHOD AND APPARATUS FOR INDUCING HEAT CHANGES” 1918
- Finkelstein, T. “OPTIMIZATION OF PHASE ANGLE AND VOLUME RATIO IN STIRLING ENGINES” Proc. Society of Automotive Engineers Detroit, Michigan January 1961
- Finkelstein, T. “SPECIFIC PERFORMANCE OF STIRLING ENGINES” Proc. 3rd Conference on the Performance of High Temperature Systems Dec. 1964 Gordon & Breach, Science Publisher 2 389 407 1969
- Schmidt, G. “THEORIE DER GESCHLOSSENEN CALORISCHEN MASCHINE VON LAUBROY UND SCHWARTZKOPFF IN BERLIN” Zeitschrift des Vereines Ö sterreichischer Ingenieure 1861 79 Zeitschrift des Vereines Deutscher Ingenieure 5 Dinglers Polytechnisches Journal 7 1 6 Der Civilingenieur 8 “THEORIE DER GESCHLOSSENEN MASCHINE” Zeitschrift des Vereines Deutscher Ingenieure 15 1 9 98 112 Jan. Feb. 1871
- Sherman, A. “MATHEMATICAL ANALYSIS OF A VUILLEUMIER REFRIGERATOR” Report NASA TM-X65534, X-763-71-125 Springfield, VA National Technical Information Center 1971