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A Curve Based Mixed System Rating Method for Unitary Air Conditioners
A Curve-Based Mixed System Rating Method for Unitary Air Conditioners (2.43 MB)
W. Vance Payne and Piotr A. Domanski
NISTIR 7225
Keywords:air conditioner, cooling capacity, cyclic degradation coefficient, mixed system, rating procedure, SEER
Abstract:The curve-based method was evaluated based on performance predictions and independent laboratory testing for nine mixed systems. Capacity predictions were within ±5% of the tested values for six of the mixed systems, and four of the SEER predictions were within ±5% of the tested SEERs. Predictions for SEER showed an under prediction bias due to the wide variation of possible values for the cyclic degradation coefficient (CD) and the necessity of assuming a conservative value of CD in mixed system rating calculations. This report includes detailed measurement data for the tested evaporators and an uncertainty analysis of the rating methodology.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899
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Last updated: 4/21/2005