Laboratory study of the dynamic losses of a single speed, split system air-to-air heat pump having tube and plate fin heat exchangers, 1985--1986

Technical Report · Tue Aug 01 04:00:00 EDT 1989

DOI:https://doi.org/10.2172/5558402· OSTI ID:5558402

Miller, W. A.

An air-to-air split-system residential heat pump of nominal 9.7-kW (2 3/4-ton) capacity was instrumented and tested in the laboratory. The coefficient of performance capacity, and component efficiencies were measured during cooling and heating mode steady state and cycling conditions and under frosting and defrosting conditions. Improvement in cycling COP and capacity was observed by controlling off-cycle refrigerant migration. Best cycling COP and capacity performance occurred for cycling tests conducted with refrigerant isolated in the indoor heat exchanger during the off cycle, coupled with 2 min of extended indoor blower operation during the off-cycle. The frosting-defrosting experiments were conducted at outdoor ambient temperatures of 4.4, 1.7, and {minus}3.8{degree}C (40, 35, and 25{degree}F) and for discrete humidity levels ranging from 60 through 80%. Frosting and defrosting algorithms were developed from the data for use in seasonal analysis simulations. Seasonal analysis calculations revealed that the reduction of frosting, defrosting, and cycling losses would result in a 3-year payback of roughly $150 to $300 to the consumer for most climatic regions in the United States. 19 refs., 75 figs., 24 tabs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE/CE
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5558402
• Report Number(s): ORNL/CON-253; ON: DE90000970
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320106* -- Energy Conservation
Consumption
& Utilization-- Building Equipment-- (1987-)
DATA ACQUISITION
DEFROSTING
EFFICIENCY
ENERGY CONSUMPTION
EVALUATION
HEAT EXCHANGERS
HEAT PUMPS
PERFORMANCE