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Theoretical analysis on efficiency factor of direct expansion PVT module for heat pump application
Solar Energy ( IF 6.7 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.solener.2020.04.053
Jian Yao , Erjian Chen , Yanjun Dai , Mingjun Huang

Abstract Direct expansion solar assisted PVT (photovoltaic/thermal) heat pump is a combination of PVT technology and heat pump technology, which can improve the comprehensive conversion efficiency of solar energy, and it is suitable for solar heating applications. In this paper, the efficiency factor of direct expansion PVT module employing roll-bond panel has been theoretically derived, modified, and validated by experimental results. Moreover, the efficiency factor could be used to design, evaluate, and optimize the thermal performance of direct expansion solar assisted heat pump systems. In addition, parameter analysis of four evaporator unit types has been conducted, and the recommendation values of each parameter have also been presented. The simulation results show that the roll-bond evaporator (fluid channel width: 10 mm) with hexagon and rectangle patterns have better temperature distribution uniformity than grid and linear types, and their temperature differences are both 0.038 °C while their dimensionless pressure losses are 0.109 and 0.230, respectively. To specifically design different kinds of PVT collector/evaporator or direct expansion evaporators, a novel design method for roll-bond evaporator is proposed, and a combination of hexagon and grid types is recommended for PVT module. Moreover, the recommendation fluid channel width of the roll-bond panel is 8 mm to 13 mm while the scaling ratio is 0.8 to 1.2. The modified efficiency factors are 0.521, 0.564, 0.549, and 0.342 of hexagon, grid, rectangle, and linear types when the fluid channel width is 10 mm, respectively.

中文翻译:

热泵应用直膨式PVT模块效率系数的理论分析

摘要 直膨胀式太阳能辅助PVT(光伏/热)热泵是PVT技术和热泵技术的结合,可以提高太阳能的综合转换效率,适用于太阳能供热应用。本文从理论上推导出了采用压焊面板的直接膨胀 PVT 组件的效率系数,并通过实验结果进行了修改和验证。此外,效率因子可用于设计、评估和优化直接膨胀太阳能辅助热泵系统的热性能。此外,还对四种蒸发器单元类型进行了参数分析,并给出了各参数的推荐值。仿真结果表明,压焊式蒸发器(流道宽度:10 mm) 六边形和矩形图案比网格和线性类型具有更好的温度分布均匀性,它们的温差均为 0.038 °C,而它们的无量纲压力损失分别为 0.109 和 0.230。针对不同类型的PVT集热器/蒸发器或直接膨胀蒸发器的具体设计,提出了一种新型的滚焊蒸发器设计方法,并建议PVT模块采用六边形和网格类型的组合。此外,压焊面板的推荐流体通道宽度为8mm至13mm,而缩放比例为0.8至1.2。当流体通道宽度为 10 mm 时,六边形、网格、矩形和线性类型的修正效率因子分别为 0.521、0.564、0.549 和 0.342。
更新日期:2020-08-01
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