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ACRC Technical Report 171PDF


Title:Finite Element Heat Exchanger Simulation Within a Newton-Raphson Framework
Author(s):Harshbarger, D.S.
Contributor(s):Bullard, C.W.
Subject(s):stationary air conditioning system analysis
Abstract:This report describes a method that allows finite element solutions to be simply implemented within a Newton-Raphson (NR) solution. The ACRC air conditioner system simulation model has been modified to accurately simulate complex heat exchangers and expansion devices using a finite element method. The system simulation model solves a set of governing equations simultaneously to determine a solution. The NR algorithm allows input and output variables to be interchanged at the user's discretion. For example, the system COP can be specified and the refrigerant charge determined. Because the NR algorithm requires accurate initial guesses for all output variables, practical execution can be cumbersome and frustrating for the user. The method detailed in this report allows the programmer to construct a simulation within a NR framework that requires fewer initial guesses. This method has been applied to the simulation of complex heat exchangers within the system simulation program. A finite element method has been used to capture the physics of multiple tube banks, or slabs, in the airflow direction. Finite element solutions for the condenser and evaporator have been implemented together with the traditional simulations of the remaining components.
Issue Date:2000-08
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center TR-170
Genre:Technical Report
Sponsor:Air Conditioning and Refrigeration Project 69
Date Available in IDEALS:2009-05-29
Identifier in Online Catalog:4291839

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