Survey of HSPF and Heating Capacity Ratings for ICM Mixed Systems Relative to OEM Mixed Systems and Highest Sales Volume Tested Combinations
William V. Payne
This investigation compares the Heating Seasonal Performance Factor (HSPF) and the high temperature heating capacity (Q(47)) ratings of Independent Coil Manufacturers (ICMs) and Original Equipment Manufacturers (OEMs) to determine the distribution of mixed system ratings provided by ICMs and OEMs. ICMs match their indoor coil/air handlers with outdoor units from several OEMs. If not laboratory tested as a complete system, these "mixed" combinations must be rated using a procedure based upon sound engineering concepts and approved by the United States Department of Energy (CFR 2006). This investigation takes the ratings published by the ICMs for their mixed systems and compares them to the HSPF and Q(47) ratings of the OEM outdoor unit/indoor unit Highest Sales Volume Tested Combinations (HSVTC) or matched systems. The ratings are compared by looking at the percentage of units with ratings that are higher, equal, and lower than the HSVTC. The percentages are calculated by taking the number of units occurring in each category and dividing by the total number of units in the survey. This survey examines the existing Air Conditioning and Refrigeration Institute's directory of unitary equipment (ARI 2006b). Only mixed systems with an active status and systems with the same ARI-type of indoor unit are compared; therefore, coil-only mixed 2 systems are compared to coil-only HSVTCs and coil-blower mixed systems are only compared to coil-blower HSVTCs.
Survey of HSPF and Heating Capacity Ratings for ICM Mixed Systems Relative to OEM Mixed Systems and Highest Sales Volume Tested Combinations, HVAC&R Equipment Performance Group
(Accessed February 24, 2024)