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ACRC Technical Report 116PDF


Title:Development and Validation of a Room Air Conditioning Simulation Model
Author(s):Mullen, C.E.; Bridges, B.D.; Porter, K.J.; Hahn, Gregory William; Bullard, C.W.
Subject(s):stationary air conditioning system analysis
Abstract:Component submodels for a room air conditioner computer simulation were developed and validated using data from a 1.5-ton room air conditioner. The room air conditioner was tested over an extremely wide range: both indoor and outdoor temperatures varied from 67 to 115 oF. During the validation, the problems associated with modeling room air conditioners were addressed: nonuniform evaporator and condenser air flow, recirculation and the capillary tube. The evaporator, condenser, capillary tube . and compressor power submodels are much more accurate than the compressor mass flow submodel, which is merely a generic curve fit of manufacturers' data. The entire validation procedure was made easier because the simulation model and solver routine are keep separate by using the Newton-Raphson solution method to solve the 160 simultaneous equations. This separation allows the user to easily "swap" parameters with variables as long as the equation remain independent. The inherent problems associated with the use of the Newton-Raphson routine with highly non-linear and discontinuous equations were overcome by developing automatic-relaxation, variable-checking, and equation-switching methods.
Issue Date:1997-04
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center TR-116
Genre:Technical Report
Sponsor:Air Conditioning and Refrigeration Project 69
Date Available in IDEALS:2009-04-24

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