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Publication Citation: Development and Verification of a Linear-Fit Mixed System Rating Method for Unitary Two-Speed and Variable-Speed Air Conditioners

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Author(s): William V. Payne;
Title: Development and Verification of a Linear-Fit Mixed System Rating Method for Unitary Two-Speed and Variable-Speed Air Conditioners
Published: June 07, 2010
Abstract: A linear-fit method of rating residential-type air conditioning systems was evaluated based on performance predictions and laboratory testing of one two-speed matched system and two mixed systems (matched two-speed condensing unit, matched indoor coil blower, and two mixed coil blowers). The individual evaporators and the condensing unit were separately tested using water heated/cooled condensing/evaporating units at standard air conditions over a range of evaporator refrigerant saturation temperatures, evaporator superheats, and liquid refrigerant temperatures. Capacity predictions were within ±1.0 % of the tested values for the mixed systems, and the EER predictions were within ±1.5 % of the measured EERs. The methods used for system rating on the two-speed system can also be applied to a variable-speed system.
Citation: NIST TN - 1667
Pages: 84 pp.
Keywords: air conditioner; cooling capacity; mixed system; rating procedure; SEER; two-speed system; variable-speed system
Research Areas: Building Energy Conservation, Building Equipment Efficiency, Sustainability Metrics and Tools
PDF version: PDF Document Click here to retrieve PDF version of paper (4MB)