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首页> 外文期刊>Energy and Buildings >Thermal performance of a solar latent heat storage unit using rectangular slabs of phase change material for domestic water heating purposes
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Thermal performance of a solar latent heat storage unit using rectangular slabs of phase change material for domestic water heating purposes

机译：使用矩形相变材料平板进行家用热水加热的太阳能潜热存储单元的热性能

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摘要

In this paper, the thermal performance of a rectangular latent heat storage unit (LHSU) coupled with a flat-plate solar collector was investigated numerically. The storage unit consists of a number of vertically oriented slabs of phase change material (PCM) exchanging heat with water acting as heat transfer fluid (HTF). During the day (charging mode), the water heated by the solar collector goes into the LHSU and transfers heat to the solid PCM which melts and hence stores latent thermal energy. The stored thermal energy is later transferred to the cold water during the night (discharging process) to produce useful hot water. The heat transfer process was modeled by developing a numerical model based on the finite volume approach and the conservation equations of mass, momentum, and energy. The developed numerical model was validated by comparing the simulation results, obtained by a self-developed code, with the experimental, numerical and theoretical results published in the literature. The numerical calculations were conducted for three commercial phase change materials having different melting points to find the optimum design of the LHSU for the meteorological conditions of a representative day of the month of July in Marrakesh city, Morocco. The design optimization study aims to determine the number of PCM slabs, water mass flow rate circulating in the solar collector and total mass of PCM that maximize the latent storage efficiency. The thermal performance of the LHSU and the flow characteristics were investigated during both charging and discharging processes. The results show that the amount of latent heat stored in the optimum design of the storage unit during the charging process is about 19.3 MJ, 16.54 MJ, and 12.79 MJ for RT42, RT50, and RT60, respectively. The results also indicate that depending on the mass flow rate of HTF, the water outlet temperature during the discharging process varies within the temperature ranges 43.6 °C-24 °C, 51.7 °C-24 °C, and 62.86 °C-24 °C for RT42, RT50, and RT60, respectively.
机译：在本文中，数值研究了与平板太阳能收集器耦合的矩形潜热存储单元（LHSU）的热性能。存储单元由许多垂直定向的相变材料板（PCM）与用作传热流体（HTF）的水进行热交换。在白天（充电模式），由太阳能收集器加热的水进入LHSU，并将热量传递到固态PCM，固态PCM熔化并因此存储潜热能。储存的热能随后在夜间（排放过程）转移到冷水中以产生有用的热水。通过建立基于有限体积方法和质量，动量和能量守恒方程的数值模型，对传热过程进行建模。通过将通过自行开发的代码获得的仿真结果与文献中发表的实验，数值和理论结果进行比较，验证了所开发的数值模型的有效性。对三种具有不同熔点的商业相变材料进行了数值计算，以找到针对摩洛哥马拉喀什市7月代表性日的气象条件的LHSU的最佳设计。设计优化研究旨在确定PCM平板的数量，在太阳能收集器中循环的水质量流速以及使潜在存储效率最大化的PCM总质量。在充电和放电过程中都研究了LHSU的热性能和流动特性。结果表明，在充电过程的最佳设计中，RT42，RT50和RT60的潜热分别约为19.3MJ，16.54MJ和12.79MJ。结果还表明，取决于HTF的质量流量，排放过程中的出水温度在43.6°C-24°C，51.7°C-24°C和62.86°C-24°C的温度范围内变化C分别代表RT42，RT50和RT60。

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