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ACRC Contract Report 47PDF


Title:Experimental and Simulation Analysis of Microchannel Evaporators
Author(s):Song, S.; Bullard, C.W.
Subject(s):Experimental and Simulation Analysis of Microchannel Evaporators
microchannel evaporators
microchannel condensers
heat pumps
Abstract:Microchannel condensers have dominated the automotive a/c market by maximizing performance for a fixed size and weight, but must operate as evaporators if they are to be used in heat pumps. This report presents a microchannel evaporator model, along with experimental validation. The new model structure provides a user-friendly interface and makes it much easier to have good initial guesses. Two different approaches for predicting wetted surface heat and mass transfer are discussed and compared, and the effects of inlet humidity and inclination angle were explored experimentally. Superheat measurements were used, together with the model to detect significant refrigerant maldistribution that reduced capacity approximately 3%. Frost patterns were used to observe two-phase flow distribution in a microchannel evaporator, and the balance between inertial, gravitational and shear forces was investigated for the vertical headers.
Issue Date:2002-03
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center CR-47
Genre:Technical Report
Date Available in IDEALS:2009-08-06

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