- Author
- Domanski, P. A. | Choi, J. M. | Payne, W. V.
- Title
- Longitudinal Heat Conduction in Finned-Tube Evaporators.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD Hanbat National Univ., Daejeon, Korea
- Sponsor
- Department of Energy, Washington, DC Air-Conditioning and Refrigeration Institute Copper Development Association Energy Research and Development Authority, New York State, NY Refrigeration Service Engineers Society Heating Refrigeration Air Conditioning Institute, Canada
- Report
- ARTI-21CR/605-5005-01,
- Book or Conf
- Refrigeration Creates the Future. International Congress of Refrigeration 2007, 22nd IIR. ICR 2007. August 21-26, 2007, Beijing, China, 1-8 p., 2007
- Keywords
- refrigeration | evaporators | heat conduction | experiments | tests | heat exchangers
- Abstract
- The paper evaluates performance of finned-tube evaporators at different refrigerant exit superheats to assess the impact of longitudinal heat conduction on capacity. A combination of capacity measurements obtained from laboratory testing, the pattern of measured return bend temperatures, and the theoretical analysis suggests the occurrence of tube-to-tube transfer via fins and rejects the tube longitudinal heat transfer as the possible causes of capacity degradation. The impact of tube-to-tube heat transfer was negligible in tests with a uniform 5.6°C superheat, but it was significant in tests involving 16.7°C superheat. The measured difference in capacity between two evaporators - in one of which tube-to-tube heat transfer was prevented by cuts in common fins - was as much as 23%. The level of capacity degradation was affected by air volumetric flow rate.