A review on the performance assessment and optimization techniques of air source heat pump water heaters used in South Africa

2016 ◽  
Author(s):  
J. Yongoua ◽  
S. Tangwe ◽  
M. Simon
Keyword(s):  
South Africa ◽  
Performance Assessment ◽  
Heat Pump ◽  
Optimization Techniques ◽  
Water Heaters ◽  
Air Source Heat Pump

The feasibility of solar thermal-air source heat pump water heaters in renewable energy shortage regions

Energy ◽  
2020 ◽  
Vol 197 ◽  
pp. 117189
Author(s):  
Meng Liu ◽  
Yueer He ◽  
Huifu Zhang ◽  
Heng Su ◽  
Ziwei Zhang
Keyword(s):  
Renewable Energy ◽  
Heat Pump ◽  
Solar Thermal ◽  
Water Heaters ◽  
Air Source Heat Pump ◽  
Energy Shortage

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

2021 ◽  
Author(s):  
Kazuki Yamaguchi ◽  
Tomohiko Ihara ◽  
Yukihiro Kikegawa
Keyword(s):  
Wind Speed ◽  
Heat Pump ◽  
Thermal Environment ◽  
Hot Water ◽  
Influential Factor ◽  
Water Supply Systems ◽  
Outdoor Air ◽  
Water Heaters ◽  
Air Source Heat Pump ◽  
The Impact

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.

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