Performance of a finned-tube evaporator optimized for different refrigerants and its effect on system efficiency |
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Authors: | Piotr A. Domanski David Yashar Minsung Kim |
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Affiliation: | Building and Fire Research Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8631, Gaithersburg, MD 20899-8631, USA |
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Abstract: | This paper presents a comparable evaluation of R600a (isobutane), R290 (propane), R134a, R22, R410A, and R32 in an optimized finned-tube evaporator, and analyzes the impact of evaporator effects on the system coefficient of performance (COP). The study relied on a detailed evaporator model derived from NIST's EVAP-COND simulation package and used the ISHED1 scheme employing a non-Darwinian learnable evolution model for circuitry optimization. In the process, 4500 circuitry designs were generated and evaluated for each refrigerant. The obtained evaporator optimization results were incorporated in a conventional analysis of the vapor compression cycle. For a theoretical cycle analysis without accounting for evaporator effects, the COP spread for the studied refrigerants was as high as 11.7%. For cycle simulations including evaporator effects, the COP of R290 was better than that of R22 by up to 3.5%, while the remaining refrigerants performed approximately within a 2% COP band of the R22 baseline for the two condensing temperatures considered. |
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Keywords: | Air conditioning Refrigerating system Evaporator Finned tube Modelling Optimization R600a R410A Propane R32 R134a R22 ComparisonMots clé s: Conditionnement d'air Systè me frigorifique É vaporateur Tube aileté Modé lisation Optimisation R600a R410a Propane R32 R134a R22 Comparaison |
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