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« lessĪ residential unitary low-temperature water-source heat pump was tested in the laboratory. Optimum year-round water temperature was found for each location. Due to the superior thermal capacity of water, water source units have higher energy efficiency. The air-source heat pumps used the ambient air temperature distribution at the location.
#Command aire nomenclature full#
Devined heat gain versus outdoor temperature lines were used for the cooling loads with 35/sup 0/C (95/sup 0/F), the full range acceptable to water-source units. The heating loads were fictitious, i.e., represented by defined heat more » loss lines versus outdoor temperature for even tons of heating load at -1.1/sup 0/C (30/sup 0/F) balance point. Energy cost saving potential with solar heating of the water and with a buried pipe grid was also investigated. The models used EER values from 6 to 10 and COP's from 2.0 to 3.6. « lessĬomputer prediction models were used to estimate energy consumption for air and water-source heat pumps in the climate of New Orleans, Baton Rouge, and Shreveport, LA and Little Rock, AR Kansas City, KS and Sioux City, IA where the balance of heating to cooling load differs and ground water temperature is proper for heat pump operation. This is in contrast to behavior for air source heat pumps, where cycling always degrades efficiency. The results tended to indicate that an improvement in COP may be achieved in cyclic operation, due to the decreased values of EWT early in the cycle. The first nondimensional group allowed analysis of startup independent of changes in independent variables, while the second nondimensional group quantified the performance benefits due to cyclic operation. Two sets of nondimensional groups were developed based on the experimental data. The decreased levels of EWT early in the cycle increased capacity and decreased power both acting to increase the COP. Based on the experimental data, it was discovered that the water temperature entering the condenser (EWT) exhibited a prolonged minimum after startup due to cooling of the water during the off-cycle. Data for operation in the cooling mode are discussed herein. The measured quantities allow calculation of instantaneous capacity, power coefficient of performance (COP), and ground-coil more » heat rejection. Water and airflow rates have been measured twice during the monitored period, and have remained constant. Monitored data include: temperature and relative humidity of return and supply air water temperature entering and leaving the condenser power consumption of the individual system components, cycling rate, on-time, and soil temperatures at various depths and radial locations. 1989 and has been monitored since then using a remote data acquisition system. A nominal 10.6 kW (three ton), vertical configuration, ground-coupled heat pump was installed in Abilene, TX in Dec.