| 摘要: |
| 本文对基于直膨式PVT（光伏光热）组件的太阳能热泵系统进行了数学模型的构建及性能仿真，分析了系统在上海地区的全年运行性能。通过直膨式集热/蒸发器将热泵系统与光伏组件相耦合，吸收光伏组件在工作时产生的废热，在降低光伏组件工作温度、提升组件发电效率的同时，提升了热泵循环的蒸发温度，从而改善了热泵系统的运行性能。基于能量平衡与集热/蒸发器换热特性建立了仿真模型，并与实验结果进行对比，最大误差为6.2%。在上海地区的气温、辐照条件下对系统运行进行了逐日的模拟。模拟结果表明：当冷凝温度为55 ℃时，系统COP在2.67~9.06之间波动，全年平均COP可达5.47；系统全年平均蒸发温度为18.34 ℃，平均得热效率为100.06%； PVT组件的全年平均工作温度比光伏组件下降20.21 ℃，可带来11.80%的全年发电增益。 |
| 关键词: 直膨式 PVT 太阳能 热泵 性能仿真 |
| DOI： |
| Received:January 24, 2022Revised:February 24, 2022 |
| 基金项目:国家自然科学基金（51961165110）资助项目。 |
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| Simulation and Annual Performance Analysis on a Direct-expansion Solar-assisted PVT Heat Pump System |
|
Liu Wenjie, Yao Jian, Dai Yanjun
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| (Engineering Research Center of Solar Energy and Refrigeration, MOE, School of Mechanical Engineering, Shanghai Jiao Tong University) |
| Abstract: |
| Mathematical modeling and simulation of a solar-assisted heat pump system based on a direct-expansion photovoltaic/thermal (PVT) module were developed to analyze its annual performance in Shanghai. The direct-expansion collector/evaporator, which couples the heat pump system with the PV module, absorbed the waste heat of the PV module and increased its electricity generation efficiency by reducing its working temperature. By contrast, such coupling enhanced the evaporation temperature and thus the performance of the heat pump. The simulation model, which was developed based on the energy balance and heat transfer feature of the collector/evaporator, was compared to the experimental results and it presented a maximum error of 6.2%. A simulation was performed under the ambient temperature and irradiation conditions of Shanghai taking one day as a time step. The results showed that the COP of the system varied between 2.67 and 9.06, with an annual average value of 5.47. The annually-averaged evaporation temperature was 18.34 ℃, with an annually-averaged thermal efficiency of 100.06%. Additionally, PVT module presented a 20.21 ℃ drop in annually-averaged working temperature compared to the PV module, which benefits the electricity generation by 11.80%. |
| Key words: direct-expansion PVT solar energy heat pump performance simulation |
