Experimental studies of a variable capacity direct-expansion solar-assisted heat pump water heater in autumn and winter conditions

Solar Energy ◽  
2018 ◽  
Vol 170 ◽  
pp. 352-357 ◽  
Author(s):  
Xiangqiang Kong ◽  
Penglong Sun ◽  
Ying Li ◽  
Kailin Jiang ◽  
Shandong Dong
Keyword(s):  
Heat Pump ◽  
Experimental Studies ◽  
Direct Expansion ◽  
Water Heater ◽  
Heat Pump Water Heater ◽  
Winter Conditions ◽  
Variable Capacity ◽  
Autumn And Winter

Experimental performance analysis of a direct-expansion solar-assisted heat pump water heater with R134a in summer

2018 ◽  
Vol 91 ◽  
pp. 12-19 ◽  
Author(s):  
Xiangqiang Kong ◽  
Penglong Sun ◽  
Shandong Dong ◽  
Kailin Jiang ◽  
Ying Li
Keyword(s):  
Performance Analysis ◽  
Heat Pump ◽  
Direct Expansion ◽  
Water Heater ◽  
Experimental Performance ◽  
Heat Pump Water Heater ◽  
Experimental Performance Analysis

Influence of different regulation modes of compressor speed on the performance of direct-expansion solar-assisted heat pump water heater

2020 ◽  
Vol 169 ◽  
pp. 115007 ◽  
Author(s):  
Xiangqiang Kong ◽  
Baigong Wang ◽  
Yanping Shang ◽  
Jinyu Li ◽  
Ying Li
Keyword(s):  
Heat Pump ◽  
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

Experimental performance analysis on a direct-expansion solar-assisted heat pump water heater

2007 ◽  
Vol 27 (17-18) ◽  
pp. 2858-2868 ◽  
Author(s):  
Y.W. Li ◽  
R.Z. Wang ◽  
J.Y. Wu ◽  
Y.X. Xu
Keyword(s):  
Performance Analysis ◽  
Heat Pump ◽  
Direct Expansion ◽  
Water Heater ◽  
Experimental Performance ◽  
Heat Pump Water Heater ◽  
Experimental Performance Analysis

Numerical study of a direct-expansion solar-assisted heat pump water heater under frosting conditions based on experiments

Solar Energy ◽  
2020 ◽  
Vol 196 ◽  
pp. 10-21 ◽  
Author(s):  
Xiangqiang Kong ◽  
Jinyu Li ◽  
Baigong Wang ◽  
Ying Li
Keyword(s):  
Heat Pump ◽  
Numerical Study ◽  
Direct Expansion ◽  
Water Heater ◽  
Heat Pump Water Heater

Thermal performance analysis of a direct-expansion solar-assisted heat pump water heater

Energy ◽  
2011 ◽  
Author(s):  
X.Q. Kong ◽  
D. Zhang ◽  
Y. Li ◽  
Q.M. Yang
Keyword(s):  
Performance Analysis ◽  
Heat Pump ◽  
Thermal Performance ◽  
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.

Experimental performance analysis and optimization of a direct expansion solar-assisted heat pump water heater

Energy ◽  
2007 ◽  
Vol 32 (8) ◽  
pp. 1361-1374 ◽  
Author(s):  
Y.W. Li ◽  
R.Z. Wang ◽  
J.Y. Wu ◽  
Y.X. Xu
Keyword(s):  
Performance Analysis ◽  
Heat Pump ◽  
Direct Expansion ◽  
Water Heater ◽  
Experimental Performance ◽  
Heat Pump Water Heater ◽  
Experimental Performance Analysis

Experimental performance analysis of a CO2 direct-expansion solar assisted heat pump water heater

2021 ◽  
Vol 125 ◽  
pp. 52-63
Author(s):  
Willian M. Duarte ◽  
Sabrina N. Rabelo ◽  
Tiago F. Paulino ◽  
Juan J.G. Pabón ◽  
Luiz Machado
Keyword(s):  
Performance Analysis ◽  
Heat Pump ◽  
Direct Expansion ◽  
Water Heater ◽  
Experimental Performance ◽  
Heat Pump Water Heater ◽  
Experimental Performance Analysis
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