The Effect of Radiation Intensity on the Performance of Direct-Expansion Solar PVT Heat Pump Systems

Applied Sciences Pub Date : 2024-07-16 DOI:10.3390/app14146169

Dianguang Zhang, Yiheng Zhou, Zongjun Yu, Tianyan Ma, Xuyang Wang

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Abstract

The objective of this study was to investigate the impact of solar radiation intensity on the performance of direct-expansion solar PVT heat pump systems. To this end, an experimental setup was constructed for direct-expansion photovoltaic (PVT) solar heat pump water heating systems and photovoltaic (PV) power generation systems. The system performance and main parameters were analyzed and discussed under different solar radiation intensities. The winter experiments in southern China revealed that the exhaust temperature of the heat pump unit varied considerably under clear conditions, while the back temperature remained stable, fluctuating between approximately −13.5 °C and 24 °C. In contrast, the power generation of PVT panels increased with the increase in radiation intensity, from 78.33 W to 122.68 W, for an increase of 56.6%. Furthermore, the total electricity generation of the PVT panels was higher than that of PV panels, with an increase of 8.7–8.3%. Nevertheless, discrepancies between experimental and theoretical data were observed, particularly under overcast conditions, where the back panel temperature error was pronounced. Additionally, the system exhibited enhanced stability at elevated temperatures in comparable environments, accompanied by an improvement in the system’s coefficient of performance (COP) by 5.67%.

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辐射强度对直接膨胀式太阳能光伏热泵系统性能的影响

本研究旨在探讨太阳辐射强度对直接膨胀式太阳能光伏热泵系统性能的影响。为此，建立了一个直膨式光伏（PVT）太阳能热泵热水系统和光伏（PV）发电系统的实验装置。对不同太阳辐射强度下的系统性能和主要参数进行了分析和讨论。在中国南方进行的冬季实验表明，在晴朗的条件下，热泵机组的排气温度变化很大，而背部温度保持稳定，大约在-13.5 °C到24 °C之间波动。相比之下，光伏电池板的发电量随着辐射强度的增加而增加，从 78.33 W 增加到 122.68 W，增加了 56.6%。此外，PVT 面板的总发电量高于 PV 面板，增幅为 8.7-8.3%。不过，实验数据与理论数据之间存在差异，特别是在阴天条件下，背板温度误差明显。此外，该系统在温度升高的可比环境中表现出更高的稳定性，同时系统的性能系数（COP）提高了 5.67%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Applied Sciences

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