Experimental Study on the Performance of Water Source Trans-Critical CO2 Heat Pump Water Heater
AbstractThe effect of the discharge pressure on the performance of the trans-critical CO2 heat pump with a low gas-cooler outlet temperature is experimentally investigated on a test rig of water source heat-pump water heater. The optimal discharge pressure of the trans-critical CO2 heat pump is investigated under different external operation conditions. When the tap-water temperature is low, the characteristic of the S-shape isotherm at the supercritical region has little effect on the occurrence of the optimal discharge pressure; while the mass flow rate of CO2, the suction pressure and the gas-cooler outlet temperature play a significant role in determining the emergence of the optimal discharge pressure. At the optimal discharge pressure, the COP reaches the peak; however, the corresponding heating capacity is still lower than its maximum, which is reached as the discharge pressure is slightly above the optimal discharge pressure. Reducing the tap-water flowrate or increasing the water-source temperature can increase the optimal discharge pressure. The COP is positively dependent on both the tap-water flowrate and the water-source temperature. In addition, the tap-water flowrate has a negligible influence on the maximum heating capacity while increasing the water-source temperature can greatly enhance the heating capacity. View Full-Text
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Liu, X.; Liu, C.; Zhang, Z.; Chen, L.; Hou, Y. Experimental Study on the Performance of Water Source Trans-Critical CO2 Heat Pump Water Heater. Energies 2017, 10, 810.
Liu X, Liu C, Zhang Z, Chen L, Hou Y. Experimental Study on the Performance of Water Source Trans-Critical CO2 Heat Pump Water Heater. Energies. 2017; 10(6):810.Chicago/Turabian Style
Liu, Xiufang; Liu, Changhai; Zhang, Ze; Chen, Liang; Hou, Yu. 2017. "Experimental Study on the Performance of Water Source Trans-Critical CO2 Heat Pump Water Heater." Energies 10, no. 6: 810.
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