The current study analyses the heat transfer characteristics of Roll Bond Photovoltaic Thermal (RB-PVT) unit. In PVT heat pump system, RB-PVT unit acts as a condenser to recover the waste heat of solar energy resource especially by taking advantages of natural cold of the sky, during nighttime. A 3D model of the RB-PVT unit was numerically investigated. Firstly, model validity was ensured with a 7.25% maximum discrepancy among simulation and experiment results. Secondly, a validated model was re-designed to the optimum dimensions and a reduction in size of RB-PVT unit system was achieved. With this reduction, either the costs are minimized or more systems are fitted in the same area. The maximum heat dissipation flux of an optimized model was determined to be 12.5% more than that of the experiment. The increase in heat dissipation flux of an optimized RB-PVT unit model may speed up ice formation process and thereby meeting the cooling load demand. Lastly, a sensitivity analysis based on an optimized RB-PVT unit model was carried out to propose the optimum operating parameters in terms of weather and refrigerant flow.

目前的研究分析了辊式粘合光伏热 (RB-PVT) 装置的传热特性。在PVT热泵系统中，RB-PVT机组作为冷凝器，在夜间特别利用天空的自然寒冷，回收太阳能资源的余热。对 RB-PVT 单元的 3D 模型进行了数值研究。首先，模拟和实验结果之间的最大差异为 7.25%，从而确保了模型的有效性。其次，将经过验证的模型重新设计为最佳尺寸，并实现了 RB-PVT 单元系统尺寸的减小。通过这种减少，要么将成本降至最低，要么在同一区域安装更多系统。优化模型的最大散热通量被确定为比实验多 12.5%。优化后的 RB-PVT 机组模型散热通量的增加可能会加速结冰过程，从而满足冷负荷需求。最后，基于优化的 RB-PVT 单元模型进行了敏感性分析，以根据天气和制冷剂流量提出最佳运行参数。