Dual-stroke heat pump field performance

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5743789

Veyo, S E

Westinghouse has developed an advanced electric heat-pump for the United States Department of Energy under contract 86X24712C with the Oak Ridge National Laboratory. Two nearly identical preprototype systems, each employing a unique dual-stroke compressor, were built and tested in the laboratory. One of these was installed in an occupied residence in Jeannette, Pa (near Pittsburgh). It has provided the heating and cooling required. The system has functioned without failure of any prototypical advanced components, although early field experience did suffer from deficiencies in the software for the breadboard micro processor control system. 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, with 450 hours missing because of malfunctions in the heat-pump, the data system, and the electrical service. Data indicate that the heat-pump is oversized for the test house since the observed lower balance point is 8/sup 0/F whereas 17/sup 0/F is optimum. Oversizing coupled with the use of resistance heat to maintain delivered air temperature warmer than 90/sup 0/F results in the consumption of more resistance heat than expected, more unit cycling, and therefore lower than expected energy efficiency. Analysis indicates that if properly sized, the system could deliver an HSPF = 8.47 Btu/Wh, and an SEER = 9.33 Btu/Wh for the observed weather profile at the field test site. Our analysis indicates that with optimal sizing the dual-stroke heat-pump will yield an HSPF 30% better than a single capacity heat-pump representative of high efficiency units in the market place today for the observed weather profile. 7 refs., 20 figs., 1 tab.

• Research Organization: Westinghouse Electric Corp., Pittsburgh, PA (USA). Research and Development Center
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5743789
• Report Number(s): CONF-841231-12; ON: DE85005247
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320100* -- Energy Conservation
Consumption
& Utilization-- Buildings
BUILDINGS
COMPUTERS
CONTROL SYSTEMS
DATA
DESIGN
ELECTRONIC CIRCUITS
ENERGY CONSUMPTION
EXPERIMENTAL DATA
HEAT PUMPS
INFORMATION
MEASURING INSTRUMENTS
MICROELECTRONIC CIRCUITS
MICROPROCESSORS
NUMERICAL DATA
PERFORMANCE
RESIDENTIAL BUILDINGS