Numerical analysis and experimental investigation into the performance of a wire-on-tube condenser of a retrofitied refrigerator
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Date
2005-04
Authors
Alam Mollik, Md. Shahin
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Abstract
The present thesis discusses (a) the analysis of a wire-on-tube condenser
under varying operating conditions of free convection using FEM where
Galerkin's weighted residual method is used to minimize the errors, and (b)
experimental verification of the performance of two wire-on-tube condensers in
a retrofitted domestic refrigerator using refrigerant R-134a. The study is
motivated by the desire to investigate if the wire-on-tube condensers used in R-
12 based refrigerators could be used in a modified refrigerator using R-134a
refrigerant. Experiments were conducted in a climate chamber under controlled
and varying ambient temperatures and mass flow rates to determine the
locations where phase change occurs and the degree of subcooling achieved.
In terms of initial and final phase change point locations the predicted results
agree with the experimental results to within ±1 0%. The coefficient of
performance (COP) of the refrigeration cycle was 2.62 when refrigerant R-12
was used. Using refrigerant R-134a in the retrofitted cycle the COP marginally
improved to 2.65. The analysis and the experiments also lead to the information
about the adequacy of the number of tubes for complete condensation of the
refrigerant vapour under given operating conditions. The methodology can be
used as a design tool for the design of wire-on-tube condenser of a small
refrigerator as well as the suitability of specific decommissioned condensers for
use in a retrofitted refrigerator.
Description
Keywords
Experimental investigation , Wire-on-tube condenser , Retrofitied refrigerator