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Author(s)

Jaehnig, Dagmar

Publisher

University of Wisconsin-Madison

Citation

Jaehnig, D. (1999). A Semi-Empirical Method for Modeling Reciprocating Compressors in Residential Refrigerators and Freezers. Master's Thesis, University of Wisconsin-Madison.

Date

1999

Subject(s)

Thesis (M.S.)--University of Wisconsin--Madison, 1999.; Dissertations Academic Mechanical Engineering.; University of Wisconsin--Madison. College of Engineering.

Abstract

Calorimeter testing data for domestic refrigerator/freezer compressors have been collected. The current method to represent compressor performance data recommended by the Air-Conditioning and Refrigeration Institute (ARI) has been applied to all experimental data. It has been found that the model does not reliably interpolate and extrapolate. A semi-empirical model to represent compressor performance has been developed. The model is based on the concept of volumetric efficiency and assumes a polytropic compression process. The model contains 5 curve fit parameters that have to be determined with non-linear regression. A minimum of 4 measurements of mass flow rate and electrical power are necessary to generate accurate compressor maps with this model. The model has been shown to extrapolate within 5% error to 10�C higher and lower condensing and evaporating temperatures than represented in the measured data. The effect of a change in ambient temperature has been compared with data available in the literature and seems well represented in the model as a change in the suction temperature.

Description

Under the supervision of Professors Sanford Klein and Douglas Reindl; 289pp.

Sponsor(s)

Sponsored by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Technical committee 7.1.

Permanent link

http://digital.library.wisc.edu/1793/7683 

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Part of

Solar Energy Laboratory MS and Ph.D Theses

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