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ACRC Technical Report 33PDF


Title:Falling film Ammonia Evaporators
Author(s):Gonzalez G, J.M.; Jabardo, J.M.S.; Stoecker, W.F.
Subject(s):falling film
spray evaporators
Abstract:This paper is a literature review and correlation of data on falling film and spray evaporators. This type of evaporator offers the potential advantages of improved heat-transfer coefficients and a reduction in charge of evaporating fluid. The challenge in reviewing papers by various authors is that the data appears in different forms, so an attempt has been made to achieve some uniformity in order to critically compare the data. Another objective of this paper is to provide guidelines for how a developer and manufacturer of this type of evaporator can improve the performance of the model under development. One of the important factors in achieving the maximum improvement in evaporator performance is the proper choice of the rate of refrigerant spray. A circulation rate that is too high increases the refrigerant charge and also increases the pumping power for the circulation of the refrigerant. On the other hand, if the spray rate is too low, some areas on the tube become dry and the heat-transfer coefficient drops off rapidly. Also, the optimum tube placement in a falling-film evaporator may not be the same as in a flooded ~vaporator. This paper also explores research studies on enhanced surfaces for ammonia and the potential combination of enhanced surfaces with the falling film concept.
Issue Date:1992-12
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center TR-33
Genre:Technical Report
Date Available in IDEALS:2009-03-13

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