- Author
- Payne, W. V. | Domanski, P. A.
- Title
- Curve-Based Mixed System Rating Method for Unitary Air Conditioners.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Sponsor
- Department of Energy, Washington, DC
- Report
- NISTIR 7225, May 2005, 125 p.
- Keywords
- air conditioners | cooling | degradation | evgaporators | databases | uncertainty | cooling capacity | cyclic degradation coefficient | mixed systems | rating procedure | SEER
- Identifiers
- tested mixed evaporators; mixed evaporator capacity determination; mixed system performance preduction; NIST predictions and ARI database comparison; generating an evaporator capacity line using EVAP-COND; uncertainty of the C-B Method; Seasonal Energy Efficiency Ratio (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.