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ACRC Contract Report 55PDF


Title:Analysis of design tradeoffs for display case evaporators
Author(s):Chandrasekharan, R.; Bullard, C.W.
Subject(s):display case evaporator
evaporator frost
coil design
Abstract:A model for simulating a display case evaporator under frosting conditions has been developed, using a quasi-steady and finite-volume approach and a Newton-Raphson based solution algorithm. It is capable of simulating evaporators with multiple modules having different geometries, e.g. fin thicknesses and pitch. The model was validated against data taken at 2-minute intervals from a well-instrumented medium temperature vertical display case, for two evaporators having very different configurations. The data from these experiments provided both the input data for the model and also the data to compare the modeling results. Redundant data was available, and was used to further analyze the data. The validated model has been used to generate some general guidelines for coil design. Effects of various geometrical parameters were quantified, and compressor performance data were used to express the results in terms of total power consumption. Using these general guidelines, a new prototype evaporator was designed, keeping in mind the current packaging restrictions, tube and fin availabilities, and is an optimum coil for the given external load conditions. Further, the validated model was used to arrive at prototype coils with some of the current tube and fin spacing restrictions removed.
Issue Date:2004-10
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center CR-55
Genre:Technical Report
Date Available in IDEALS:2009-08-06

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