Observational evaluation of outdoor cooling potential of air-source heat pump water heaters

Abstract

Heat pump water heaters are highly efficient hot water supply systems that effectively utilize the heat of outdoor air via heat pump technology. Many studies have been conducted to optimize the design and operation of heat pump water heaters from the perspective of climate change mitigation. Air-source heat pump water heaters, which absorb heat from the outdoor air and emit cold exhaust, can also be expected to alleviate the urban heat island effect; however, this has not been studied extensively. To estimate the impact of cold exhaust on building-scale climate, we conducted a multipoint measurement of the outdoor thermal environment around a low-rise apartment building equipped with air-source heat pump water heaters, in both summer and winter. Observations showed a substantial cooling effect that decreased air temperatures by 1 °C within the site boundary on summer nights when multiple heat pump water heaters operated concurrently. The analysis revealed that the sensitivity of the ambient temperatures to cold exhaust depends strongly on local atmospheric conditions. The most influential factor was the wind direction: the sensitivity increased significantly when the exhaust outlet location was at the lee side of the building. Naturally, the wind speed also affected the sensitivity, which tended to be higher when the wind speed was lower. The convective stability near the ground surface, however, showed no significant influence over the sensitivity.

Loss of disability-adjusted life years due to heat-related sleep disturbance in the Japanese

“…Promising measures to reduce urban heat islands, such as increasing the albedo of urban surfaces and installing vegetated green spaces, have limited effect on reducing nighttime temperature [ 55 ], because there is no solar radiation at night. Since the atmosphere is relatively stable at night, anthropogenic heat reduction measures, such as the installation of air-source heat pump water heaters [ 56 ], will play an important role in reducing the outdoor temperature to 24.8 °C.…”