Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5016986 | International Journal of Refrigeration | 2017 | 35 Pages |
Abstract
In the present study, tests were performed to investigate the direct expansion evaporation characteristics of ammonia on shell side of triangular pitch plain tube bundle at saturation temperature of â1.7 °C and â20 °C, with heat flux ranging from 5 to 45âkW mâ2, and inlet quality from 0 to 30% with exit degree of superheat ranging from 2 to 10 °C. The results suggest that heat transfer coefficient increases with both saturation temperature and heat flux and decreases with degree of exit superheat. The inlet quality effects were more significant at higher saturation temperature than at lower saturation temperature. A correlation was developed for outside boiling of ammonia on plain tube bundle in direct expansion mode with inlet vapor quality and compared with previous pool boiling and bundle correlations with ammonia as a refrigerant.
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Mechanical Engineering
Authors
Ahmad Abbas, Zahid H. Ayub, Adnan H. Ayub, Javed A. Chattha,