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Effects of Fin Conduction and Superheat Unbalance on the Performance of an Evaporator  

Choi Jong Min (Department of Mechanical Engineering, Hanbat National University)
Kim Yongchan (Department of Mechanical Engineering, Korea University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.17, no.3, 2005 , pp. 216-222 More about this Journal
Abstract
An experimental investigation was executed to determine the capacity degradation due to fin conduction and non-uniform refrigerant distribution in a multi-path evaporator with cross-counter flow. The finned-tube evaporator, which had a three-path and three-depth-row, was tested by controlling inlet quality, exit pressure, and exit superheat for each refrigerant path. The capacity reduction due to superheat unbalance between each path was as much as $25\%$ for non-cutting evaporator, even when the overall evaporator superheat was kept at a target value of $5.6^{\circ}C$. It indicates that the internal heat transfer within the evaporator assembly causes the partial capacity drop. The capacity of cutting-evaporator with respect to non-cutting evaporator was enhanced according to the increment of air flow rate when superheat or superheat unbalance increased.
Keywords
Superheat; Multi-path; Fin conduction; Cutting- evaporator; Non-cutting evaporator;
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  • Reference
1 ANSI/ASHRAE Standard 37, 1988, Methods of Testing for Rating Unitary Air Conditioning and Heat Pump Equipment, ASHRAE, Atlanta
2 Lee, J., Domanski, P.A., 1997, Impact of air and refrigerant maldistributions on the performance of finned-tube evaporators with R22 and R407C, Report DOE/CE/23810-81 for ARI, NIST, Gaithersburg, MD
3 Lin, Y.T., Hsu, K.C., Chang Y.J., Wang C.C., 2001, Performance of rectangular fin in wet conditions: visualization and wet fin efficiency, Journal of Heat Transfer, Vol. 123, pp. 827-836   DOI   ScienceOn
4 Kirby, E.S., Bulland, C.W., Dunn, W.E., 1998, Effect of airflow nonuniformity on evaporator performance, ASHRAE Trans., Vol. 194, No. 2, pp. 755-762
5 McLinden, M.O., Klein, S.A., Lemmon, E.W., Peskin, A.P., 1998, NIST thermodynamic and transport properties of refrigerant and refrigerant mixtures (REFPROP). Version 6.01. Gaithersburg, MD:NIST, USA
6 Ellison, P.R., Crewick, F.A., Ficher, S.K., Jackson, W.L., 1981, A computer model for aircooled refrigerant condenser with specified refrigerant circuiting, ASHRAE Trans., Vol. 72, No. 2, pp. 1106-1124
7 ANSI/AMCA 210, 1985, Laboratory methods of testing fans for rating, ANSI, Arlington, USA
8 Liang, S.Y. Wong, T.N., Nathan, G.K., 1998, Study of refrigerant circuitry of evaporator coil with a distributed simulation model, 7th Int. Refrigeration Conference, Purdue, pp. 823-833