Numerical investigation and parametric analysis of a photovoltaic thermal system integrated with phase change material
Numerical investigation and parametric analysis of a photovoltaic thermal system integrated with phase change material
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相变材料集成光伏热系统数值研究与参数分析
DOI：
10.1016/j.apenergy.2019.01.103
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发表时间：
2019-03
期刊：
影响因子：
11.2
通讯作者：
Ma T.
中科院分区：
文献类型：
--
作者：
Ma T.
本文开发并模拟了集成相变材料（PVT/PCM）的光伏热系统的综合三维模型。采用参数分析的方法研究了一些关键参数对以水为工质的PVT/PCM系统性能的影响。本研究考虑的参数包括 PCM 的特性（即熔化温度、熔化热和导热系数）、太阳辐射和质量流量。参数分析范围是根据市场上大多数现有相变材料的特性选择的，这表明了数值研究的实际应用。此外，还模拟了PVT系统的三维模型，并将其性能与PVT/PCM系统进行了比较。热函孔隙率法用于模拟相变材料的凝固和熔化。为了求解控制方程，采用了使用 ANSYS Fluent 16.2 中瞬态求解器的基于压力的有限体积法。此外，选择 SIMPLE 算法来提供压力和速度分量之间的耦合。结果表明，与纯 PVT 系统相比，PVT/PCM 系统具有较低的表面温度和冷却液出口温度。结果还表明，将PCM的熔化温度从40°C提高到65°C，表面温度从51.53°C增加到58.78°C，同时将熔化的PCM的百分比从82.7%降低到9.6%。还得出结论，随着 PCM 导热性的增强，PVT/PCM 系统的电能和热能效率都会提高。
In this paper, a comprehensive three-dimensional model of photovoltaic thermal system integrated with phase change material (PVT/PCM) is developed and simulated. The effect of some key parameters using parametric analysis on performance of PVT/PCM system with water as working fluid is investigated. Parameters considered in this study include the properties of PCM (i.e. melting temperature, enthalpy of fusion and thermal conductivity), solar radiation and mass flow rate. The parametric analysis ranges are selected according to the properties of the most of available PCMs on the market, which shows the practical application of the numerical research. Furthermore, a three-dimensional model of PVT system is simulated as well to compare its performance with PVT/PCM system. An enthalpy-porosity method is used to simulate the solidification and melting of PCM. To solve the governing equations, the pressure-based finite volume method using transient solver in ANSYS Fluent 16.2 is employed. Moreover, the SIMPLE algorithm is selected to provide the coupling between the pressure and velocity components. The results present that the PVT/PCM system has lower surface temperature and coolant outlet temperature compared to the PVT only system. The results also shows that enhancing the melting temperature of PCM from 40 °C to 65 °C increases the surface temperature from 51.53 °C to 58.78 °C, while it reduces the percentage of melted PCM from 82.7% to 9.6%. It is also concluded that as the thermal conductivity of PCM enhances, both electrical and thermal energy efficiency of PVT/PCM system increase.
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