Laboratory tests of a residential low-temperature water source heat pump

Conference · Wed Jun 01 04:00:00 EDT 1983 · ASHRAE Trans.; (United States)

OSTI ID:6499360

Mei, V C

A residential unitary low-temperature water-source heat pump was tested in the laboratory. Tests were performed over a broad range of source-water temperature 45 to 70/sup 0/F (7.2 to 21.1/sup 0/C) and water-flow rates 5 to 30 gpm (3.2 X 10/sup -4/m/sup 3//s to 8.2 X 10/sup -4/m/sup 3//s). The heat pump capacity and coefficient of performance (COP) were found to be linearly related to the source-water temperatures. In the heating mode, the capacity and COP increased with increasing source-water temperature and flow rate. In the cooling mode, the capacity and COP decreased with increasing source-water temperature but increased with increasing water-flow rate. However, when an assumed water-pumping power, for a 150 ft (46 m) total head, was taken into account in the COP calculation, it was found that the net COP for both heating and cooling decreased with increasing water-flow rate. For cyclic operation over the tested source-water temperature range, the coefficient of degradation, C /SUB D/, ranged from 0.196 to 0.137 for heating and from 0.131 to 0.161 for cooling. The effect of inlet air humidity was also studied for cooling mode operation. A sample calculation is included in the paper to demonstrate the application of the test results in calculating the annual performance factor (APF). The test results are used to form a data base on the performance of a typical residential, unitary low-temperature water-source heat pump.

• Research Organization: Oak Ridge National Laboratory, Oak Ridge, TN
• OSTI ID: 6499360
• Report Number(s): CONF-830640-
• Conference Information: Journal Name: ASHRAE Trans.; (United States) Journal Volume: 89
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320101* -- Energy Conservation
Consumption
& Utilization-- Residential Buildings-- (-1987)
BENCH-SCALE EXPERIMENTS
BUILDINGS
CALCULATION METHODS
CAPACITY
COEFFICIENT OF PERFORMANCE
CONTROL
COOLING
ENERGY TRANSFER
FLOW RATE
FLUIDS
HEAT PUMPS
HEAT TRANSFER
HEATING
HUMIDITY
LOW TEMPERATURE
PERFORMANCE
RESIDENTIAL BUILDINGS
TEMPERATURE CONTROL
WATER SOURCE HEAT PUMPS
WORKING FLUIDS