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ACRC Technical Report 72PDF


Title:Experimental Investigation and Simulation of Split System Air Conditioners Charged with Zeotropic Refrigerants
Author(s):Nygaard, T.R.
Contributor(s):Pederson, C.O.
Subject(s):R-22 alternatives
Abstract:This work evaluates the performance and control of split system air conditioners charged with a zeotropic, HCFC-22 alternative consisting of HFC-32, HFC-125, and HFC-134a (23%,25%, and 52% respectively). The study involves the development of two analysis tools: a split system air conditioner testing facility, and a mathematical system model that predicts the performance of the facility. The experimentally validated system model is used to analyze the potential system performance gains resulting from enhanced evaporator air-refrigerant temperature profiles. In particular, six different evaporator designs with varying tube arrangements are included in the system simulation to evaluate the effects of increasing the number of evaporator rows on air conditioner efficiency. Finally, the control of a system charged with the zeotrope is evaluated. Changes in system capacity, sensible heat ratio, and system efficiency resulting from controlling evaporator air flow rate, compressor speed, and expansion valve opening are quantified.
Issue Date:1995-04
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center TR-72
Genre:Technical Report
Sponsor:Air Conditioning and Refrigeration Center Project 29
Date Available in IDEALS:2009-04-17
Identifier in Online Catalog:3830690

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