LONGITUDINAL HEAT CONDUCTION IN FINNED-TUBE EVAPORATORS
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 ℃ superheat, but it was significant in tests involving 16.7 ℃ 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.
P.A.DOMANSKI J.M.CHOI W.V.PAYNE
National Institute of Standards and Technology, 100 Bureau Drive, Mail Stop 8631 Gaithersburg, Maryl Department of Mechanical Engineering, Hanbat National University 16-1, Duckmyoung-Dong, Yuseong-Gu,
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）