Experimental Study and Exergy Analysis of Internally Focused Vacuum Tube Collector Heat Pump System
This article proposes a direct expansion solar thermal heat pump with a collector composed of internal concentrating vacuum tubes to enhance system performance.An experimental setup was construc-ted to obtain empirical data and thoroughly investigate the thermodynamic performance of the system un-der various operating conditions.The results indicate that solar irradiance significantly affects system per-formance.When solar irradiance increases from 400 W/m2 to 800 W/m2,the system's Coefficient of Per-formance(COP)rises from 4.18 to 5.34,while the collector efficiency decreases from 0.94 to 0.67.At the same time,the system's exergy loss increases from 1 175.33 W to 2 290.27 W,and the exergy effi-ciency decreases from 16.82％to 11.99％.Additionally,the impact of circulating water inlet tempera-ture and ambient temperature on system performance is much smaller compared to solar irradiance.The collector serves as the component of the system that extracts energy from solar radiation,and optimizing its design will contribute to improving system performance.
solar energyall-glass vacuum tubeCOPthermal collection efficiencyexergy loss
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