Heat pump on-off capacity control and defrost performance tests using demand and time-temperature defrost controls
Technical Report
·
OSTI ID:6163969
Two heat pumps were tested at several on-off cycles to determine performance at part load conditions. Also, the heat pumps were tested at full capacity under frost buildup conditions with both time-temperature and demand deforst controls. The objectives were to develop correlations for use in seasonal performance models. For on-off cycling, it was found that COP as a fraction of steady state COP could be predicted with power law relationships involving capacity as a fraction of steady state capacity. Frost buildup occurred in a two step process, with initial gradual frost buildup to a transition point followed by rapid frost buildup until a defrost cycle was initiated. Heat capacities under frost buildup conditions were predicted as a function of outdoor air temperature and difference between specific humidity of the outtdoor air and specific humidity of saturated air at outdoor coil temperatures.
- Research Organization:
- Science Applications, Inc., La Jolla, CA (USA)
- DOE Contract Number:
- AC01-79CS10757
- OSTI ID:
- 6163969
- Report Number(s):
- SAI-444-80-278-LJ/Rev.
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320101* -- Energy Conservation
Consumption
& Utilization-- Residential Buildings-- (-1987)
AMBIENT TEMPERATURE
COEFFICIENT OF PERFORMANCE
CONTROL SYSTEMS
CORRELATIONS
FREEZING
HEAT PUMPS
HUMIDITY
PERFORMANCE TESTING
PHYSICAL PROPERTIES
SEASONAL VARIATIONS
SPECIFIC HEAT
TEMPERATURE DEPENDENCE
TESTING
THERMAL CYCLING
THERMODYNAMIC PROPERTIES
VARIATIONS
320101* -- Energy Conservation
Consumption
& Utilization-- Residential Buildings-- (-1987)
AMBIENT TEMPERATURE
COEFFICIENT OF PERFORMANCE
CONTROL SYSTEMS
CORRELATIONS
FREEZING
HEAT PUMPS
HUMIDITY
PERFORMANCE TESTING
PHYSICAL PROPERTIES
SEASONAL VARIATIONS
SPECIFIC HEAT
TEMPERATURE DEPENDENCE
TESTING
THERMAL CYCLING
THERMODYNAMIC PROPERTIES
VARIATIONS