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Author
Domanski, P. A. | Yashar, D. A. | Kim, M.
Title
Performance of a Finned-Tube Evaporator Optimized for Different Refrigerants and Its Effect on System Efficiency.
Coporate
National Institute of Standards and Technology, Gaithersburg, MD
Journal
International Journal of Refrigeration, Vol. 28, No. 6, 820-827, September 2005
Keywords
evaporators | refirgerants | air conditioning | evaluation | climate | emissions | simulation | propane
Identifiers
refrigerating system; finned tube; coefficient of performance (COP); input data to CYCLE_D; performance for the theoretical cycle and the cycle accounting for evaporator effects; summary of simulation results for ISHED 1-optimized designs; impact of evaporator performance on system COP; evaporator performance with selected refirgerants
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.