Review of Test Procedure for Determining HSPFs of Residential Variable-Speed Heat Pumps
Abstract
This report reviews the suitability of the existing Heating Seasonal Performance Factor (HSPF) ratings and testing requirements for the current generation of variable-speed (VS) air-source heat pumps. Recent field test results indicate larger discrepancies between rated HSPF and field-observed HSPF for VS models than for single-speed models in the same houses. These findings suggest that the heating season test and ratings procedure should be revisited for VS heat pumps. The ratings and testing procedures are described in ANSI/AHRI 210/240 (2008) for single-speed, two-capacity, and variable-speed units. Analysis of manufacturer and independent test performance data on VS units reveals why the current VS testing/ratings procedure results in overly optimistic HSPF ratings for some VS units relative to other types of heat pumps. This is due to a combination of extrapolation of low speed test data beyond the originally anticipated ambient temperature operating range and the constraints of unit controls, which prevent low speed operation over the range of ambient temperatures assumed in the procedure for low speed. As a result, the HSPFs of such units are being overpredicted relative to those for single- and two-capacity designs. This overprediction has been found to be significantly reduced by use in the HSPF ratingsmore »
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Building Technologies Research and Integration Center (BTRIC)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1223081
- Report Number(s):
- ORNL/TM-2015/387
BT0400000; CEBT002
- DOE Contract Number:
- AC05-00OR22725
- Resource Type:
- Technical Report
- Country of Publication:
- United States
- Language:
- English
- Subject:
- heat pump; variable-speed; HSPF; residential; ratings
Citation Formats
Rice, C. Keith, Munk, Jeffrey D., and Shrestha, Som S. Review of Test Procedure for Determining HSPFs of Residential Variable-Speed Heat Pumps. United States: N. p., 2015.
Web. doi:10.2172/1223081.
Rice, C. Keith, Munk, Jeffrey D., & Shrestha, Som S. Review of Test Procedure for Determining HSPFs of Residential Variable-Speed Heat Pumps. United States. https://doi.org/10.2172/1223081
Rice, C. Keith, Munk, Jeffrey D., and Shrestha, Som S. 2015.
"Review of Test Procedure for Determining HSPFs of Residential Variable-Speed Heat Pumps". United States. https://doi.org/10.2172/1223081. https://www.osti.gov/servlets/purl/1223081.
@article{osti_1223081,
title = {Review of Test Procedure for Determining HSPFs of Residential Variable-Speed Heat Pumps},
author = {Rice, C. Keith and Munk, Jeffrey D. and Shrestha, Som S.},
abstractNote = {This report reviews the suitability of the existing Heating Seasonal Performance Factor (HSPF) ratings and testing requirements for the current generation of variable-speed (VS) air-source heat pumps. Recent field test results indicate larger discrepancies between rated HSPF and field-observed HSPF for VS models than for single-speed models in the same houses. These findings suggest that the heating season test and ratings procedure should be revisited for VS heat pumps. The ratings and testing procedures are described in ANSI/AHRI 210/240 (2008) for single-speed, two-capacity, and variable-speed units. Analysis of manufacturer and independent test performance data on VS units reveals why the current VS testing/ratings procedure results in overly optimistic HSPF ratings for some VS units relative to other types of heat pumps. This is due to a combination of extrapolation of low speed test data beyond the originally anticipated ambient temperature operating range and the constraints of unit controls, which prevent low speed operation over the range of ambient temperatures assumed in the procedure for low speed. As a result, the HSPFs of such units are being overpredicted relative to those for single- and two-capacity designs. This overprediction has been found to be significantly reduced by use in the HSPF ratings procedure of an alternative higher-load heating load line, described in a companion report (Rice et al., 2015).},
doi = {10.2172/1223081},
url = {https://www.osti.gov/biblio/1223081},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Aug 01 00:00:00 EDT 2015},
month = {Sat Aug 01 00:00:00 EDT 2015}
}