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Hail Effects on Air-Conditioner Performance

Matthew J. Sitzmann, Frank K. Lu, Steve R. Smith
2007 Volume 6: Energy Systems: Analysis, Thermodynamics and Sustainability   unpublished
Experiments demonstrated the effects on air-conditioner system performance resulting from dents in fins of their condenser coils and the extent to which conventional fin repair methods restore performance. Two different, commercially available, split-system, residential-type air-conditioners were tested. Flattening substantial areas of the fins caused a reduction in capacity and efficiency of the cooling systems tested. Performance first dropped appreciably when 60% of the fin areas were
more » ... n areas were pressed flat. Incremental increases in total percentages of areas flattened beyond the first reduction in performance resulted in incremental decreases in capacity and efficiency. Specifically, with 60% of the fin area flattened on one condenser, system capacity decreased 4%; system SEER (efficiency), 9%. With 100% of the fin area flattened, system capacity decreased 27%; system SEER, 34%. Combing dents from the fins after the extreme case where all fins were flat-tened restored capacity to within 1% of the undented condition and SEER to within 6% of the undented efficiency. Similar results were obtained for the second condenser tested.
doi:10.1115/imece2007-41518 fatcat:mvevep7emfecdpwxaqb3535ykq