Subcooling control method for the adjustable ejector in the direct expansion solar assisted ejector-compression heat pump water heater

2019 ◽  
Vol 148 ◽  
pp. 662-673 ◽  
Author(s):  
Jiaheng Chen ◽  
Jianlin Yu ◽  
Suxin Qian
Keyword(s):  
Heat Pump ◽  
Control Method ◽  
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

scholarly journals Experimental Study of a Novel Direct-Expansion Variable Frequency Finned Solar/Air-Assisted Heat Pump Water Heater

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Jing Qin ◽  
Jie Ji ◽  
Wenzhu Huang ◽  
Hong Qin ◽  
Mawufemo Modjinou ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Ambient Temperature ◽  
Heat Pump ◽  
Operating Mode ◽  
Heating Time ◽  
Solar Irradiation ◽  
Variable Frequency ◽  
Direct Expansion ◽  
Water Heater ◽  
Heat Pump Water Heater

A novel direct expansion variable frequency finned solar/air-assisted heat pump water heater was fabricated and tested in the enthalpy difference lab with a solar simulator. A solar/air source evaporator-collector with an automatic lifting glass cover plate was installed on the system. The system could be operated in three modes, namely, air, solar, and dual modes. The effects of the ambient temperature, solar irradiation, compressor frequency, and operating mode on the performance of this system were studied in this paper. The experimental results show that the ambient temperature, solar irradiation, and operating mode almost have no effect on the energy consumption of the compressor. When the ambient temperature and the solar irradiation were increased, the COP was found to increase with decreasing heating time. Also, when the compressor frequency was increased, an increase in the energy consumption of the compressor and the heat gain of the evaporator were noted with a decrease in the heating time.

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