|Title:||Feasibility of Using Extruded Aluminum Tubing for Refrigerator Heat Exchangers
|Author(s):||Goslovich, K.S.; Bullard, C.W.
|Abstract:||The goal of this study was to determine whether extruded aluminum tubing could be used
in the manufacture of a condenser and evaporator for a domestic refrigerator that would be
competitive with conventional technology. A variety of tube geometries were examined.
Condenser and an evaporator models were constructed using two-phase flow correlations to
account for "refrigerant-side pressure drop. The duct size and airflow rate were held within
conventional limits for comparison. Constraints on the tube spacing insured that there would beroom
for cleaning the condenser coil and that the evaporator would not become blocked by frost.
An analysis of base case tube geometries showed that using two parallel circuits substantially
reduced the amount of aluminum. Optimal condenser and evaporator designs were found by
minimizing component cost. The best condenser design used a tube with 10 sub-millimeter ports
with 6 mm lateral fins to increase heat transfer. The optimal evaporator design also incorporated
lateral fins, but had only one relatively large port. A model of a refrigerator system was
constructed and used to determine the effect of pressure drop on COP for a 150 W evaporator.
The optimal component designs were used as initial guesses for the system analysis. The results
showed that a feasible design does exist that is comparable in cost to conventional heat exchangers.
Further, the extruded aluminum exchangers reduce refrigerant charge and can provide a higher
COP than the current technology.
|Publisher:||Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
|Series/Report:||Air Conditioning and Refrigeration Center TR-76
|Sponsor:||University of Illinois
|Date Available in IDEALS:||2009-04-17
|Identifier in Online Catalog:||3884321