Experimental investigation on a direct-expansion solar-assisted heat pump water heater using R290 with micro-channel heat transfer technology during the winter period

2020 ◽  
Vol 113 ◽  
pp. 38-48 ◽  
Author(s):  
Xiangqiang Kong ◽  
Yimeng Yang ◽  
Maoyuan Zhang ◽  
Ying Li ◽  
Jianbo Li
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Heat Pump ◽  
Winter Period ◽  
Micro Channel ◽  
Direct Expansion ◽  
Water Heater ◽  
Heat Pump Water Heater

Control strategy and experimental analysis of a direct-expansion solar-assisted heat pump water heater with R134a

Energy ◽  
2018 ◽  
Vol 145 ◽  
pp. 17-24 ◽  
Author(s):  
Xiangqiang Kong ◽  
Kailin Jiang ◽  
Shandong Dong ◽  
Ying Li ◽  
Jianbo Li
Keyword(s):  
Heat Pump ◽  
Control Strategy ◽  
Experimental Analysis ◽  
Direct Expansion ◽  
Water Heater ◽  
Heat Pump Water Heater

Water Mass Flow and Air Relative Humidity on Performance of Air - Source Heat Pump Water Heater

2015 ◽  
Vol 1092-1093 ◽  
pp. 127-130
Author(s):  
Zhi Jiang Wu ◽  
Yan Sheng Xu
Keyword(s):  
Heat Transfer ◽  
Relative Humidity ◽  
Heat Pump ◽  
Mass Flow ◽  
Water Mass ◽  
Water Heater ◽  
Air Source Heat Pump ◽  
Heat Pump Water Heater ◽  
Condenser Temperature ◽  
Discharge Pressure

The water mass flow and air relative humidity on the performance of air-source heat pump water heater was discussed in this paper. The results show that the energy efficiency of heat pump water heater is improved by correct the water mass flow and discharge pressure can be reduced, the value of the condenser temperature difference between the import and export of water also can be reduced. Increasing the air relative humidity, the more condensated water on evaporator surface effective, the greater the wetting area. In addition, the heat transfer of latent heat can be increased by the growth of air side and refrigerant side heat transfer coefficient.

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