Experimental correlation of falling film condensation on enhanced tubes with HFC134a; low-fin and Turbo-C tubes |
| |
Authors: | Yong Tae Kang Hiki Hong Young Soo Lee |
| |
Affiliation: | aSchool of Mechanical System Engineering, Kyung Hee University, Yong-In, Kyung-Gi 449-701, Republic of Korea;bKorea Energy Research Institute, Yusung, Daejeon 305-343, Republic of Korea |
| |
Abstract: | The objectives of this paper are to develop experimental correlations of heat transfer for enhanced tubes used in a falling film condenser, and to provide a guideline for optimum design of the falling film condenser with a high condensing temperature of 59.8 °C. Tests are performed for four different enhanced tubes; a low-fin and three Turbo-C tubes. The working fluid is HFC134a, and the system pressure is 16.0 bar. The results show that the heat transfer enhancement of low-fin tube, Turbo-C (1), Turbo-C (2) and Turbo-C (3) ranges 2.8–3.4 times, 3.5–3.8 times, 3.8–4.0 times and 3.6–3.9 times, respectively, compared with the theoretical Nusselt correlation. It was found that the condensation heat transfer coefficient decreased with increasing the falling film Reynolds number and the wall subcooling temperature. It was also found that the enhanced tubes became more effective in the high wall subcooling temperature region than in the low wall subcooling temperature region. This study developed an experimental correlation of the falling film condensation with an error band of ±5%. |
| |
Keywords: | Refrigeration Air conditioning Condensation Falling film Tube Enhanced Experiment Heat transfer Correlation R134aMots clé s: Ré frigé ration Conditionnement d’ air Condensation Film tombant Tube Surface augmenté e Expé rimentation Transfert de chaleur Corré lation R134a |
本文献已被 ScienceDirect 等数据库收录! |
|