Shell side direct expansion evaporation of ammonia on a plain tube bundle with inlet quality effect in the presence of exit superheat |
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| Affiliation: | 1. Natural Fluids Refrigeration Center, Faculty of Mechanical Engineering, GIK Institute of Engineering Sciences and Technology, Topi, Pakistan;2. Isotherm, Inc., 7401 Commercial Blvd. E., Arlington, TX, USA;1. Dipartimento di Ingegneria Industriale, Sezione ETEC, Università degli Studi di Napoli “Federico II”, P.le V. Tecchio 80, Napoli 80125, Italy;2. Instituto de Ingeniería Energética, Universitat Politècnica de València, Camino de Vera s/n, Valencia 46022, Spain;1. Department of Mechanical Engineering, BITS-Pilani, Rajasthan, India;2. Department of Mechanical Engineering, IITRAM, Gujarat, India;1. Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;2. Beijing Key Laboratory of Heating, Gas Supply, Ventilating and Air Conditioning Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;3. China Mobile Group Design Institute Co., Ltd., Beijing 100044, China |
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| 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 ?1.7 °C and ?20 °C, with heat flux ranging from 5 to 45 kW m?2, 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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