Engineering field evaluation of the Westinghouse/DOE dual-stroke advanced electric heat pump
Technical Report
·
OSTI ID:6978176
A preprototype advanced electric heat pump with a unique dual-stoke compressor was installed in an occupied residence in Jeannette, PA (near Pittsburgh). Analysis of field performance data indicates a heating performance factor (HSPF) of 8.13 Btu/Wh, and a cooling energy efficiency (SEER) of 8.35 Btu/Wh for the year April 1, 1983 through March 31, 1984. For the year April 1, 1984 through March 31, 1985, the indicated heating season performance factor (HSPF) was 8.51 Btu/Wh and the cooling season energy efficiency ratio (SEER) was 7.89 Btu/Wh. During the first heating season the peak electrical demand at temperatures above 42/sup 0/F was 4.0 kW. At lower temperatures the demand reached a peak of 18.0 kW at -2/sup 0/F. During the second heating season modifications to the method of controlling resistance heat and lowering of the upper and lower heating balance points reduced the peak demand to 3.8 kW at temperatures above 38/sup 0/F. Maximum demand at -10/sup 0/F was 14.6 kW. Peak electrical demand during cooling operation ranged from 2.1 to 4.6 kW during the first cooling season and 2.2 to 4.2 kW during the second cooling season. The heat pump was considerably oversized for the test house since the observed lower balance point was 8/sup 0/F whereas 17/sup 0/F was optimum. Analysis indicates that if properly sized, the system could deliver an HSPF = 8.47 Btu/Wh (30% better than a single capacity heat pump representative of high efficiency units in the market place today), and an SEER = 9.33 Btu/Wh for the weather profile observed at the field test site during the first test year.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6978176
- Report Number(s):
- ORNL/Sub-79-24712/4; ON: DE87007804
- Country of Publication:
- United States
- Language:
- English
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