Study on the Effect of Structural Parameters on the Performance of Sheet-and-tube PV/T Collectors
In this paper,the classic Hottel-Whillier model for flat plate collectors was modified for sheet-and-tube PV/T collectors and experimental data was used to verify the modified simulation model.Then,with the verified simulation mode,the influence of the thickness and thermal conductivity of the heat-absorbing plate,the spacing and inner diameter of heat absorbing tube,the thickness of the insulation layer,and the PV power on the thermal efficiency,electrical efficiency,and total efficiency of the sheet-and-tube PV/T collector was studied.On this basis,the sensitivity analysis method was used to analyze the influence of the structural parameters on the performance of the sheet-and-tube PV/T collector.The results show that the magnitude of influence on the performance of sheet-and-tube PV/T collector is as follows:the PV power,the heat absorbing tube spacing,the thickness and the thermal conductivity of the heat absorbing plate,the inner diameter of the heat absorbing tubes,the thickness of the insulation layer.Since the sensitivity coefficient corresponding to the PV power and the heat-absorbing tube spacing are significantly higher than the other four parameters,it was determined as the key structural parameters,and used to determine the key structural parameters of PV/T collectors.
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