CFD modelling development and experimental validation of a phase change material (PCM) heat exchanger with spiral-wired tubes
CFD modelling development and experimental validation of a phase change material (PCM) heat exchanger with spiral-wired tubes
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DOI：
10.1016/j.enconman.2017.12.036
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发表时间：
2018-02
影响因子：
10.4
通讯作者：
W. Youssef;Y. Ge;S. Tassou
中科院分区：
文献类型：
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作者：
W. Youssef;Y. Ge;S. Tassou
采用相变材料进行潜热储存对提高太阳能热系统的性能具有很大的潜力。尽管如此，由于可用PCM的导热性差，PCM在该领域的使用相当有限。因此，强化传热是克服这一障碍的基本策略之一。本文结合相关项目，设计了一种螺旋丝管相变换热器（HX），并将其集成到间接式太阳能热泵试验系统中。虽然螺旋线管还没有应用在PCM HX中，但它有望显著提高PCM的传热和蓄热性能。为了验证这一点并了解PCM热存储和释放过程，已为PCM HX开发了详细的3D CFD模型，并通过测量进行了验证。因此，在充电和放电过程中的PCM的温度变化和可视化的模拟和时间。此外，在这项研究中，不同的入口传热流体的流量和温度上的PCM熔化/固化时间的影响被证明。模拟结果对换热器的运行及其与太阳能系统的集成具有重要的指导意义。
Employing phase change materials (PCMs) for latent heat storage (LHS) application has a great potential to improve a solar thermal system performance. Despite this fact, the use of PCM in this area is quite limited due to the poor thermal conductivity of available PCMs. Therefore, heat transfer enhancement is one of the essential strategies that can overcome this obstacle. In this paper and related project, a PCM heat exchanger (HX) is purposely designed with spiral-wired tubes and integrated in an indirect solar assisted heat pump test system. Although the spiral-wired tube has not been applied in a PCM HX, it is expected to enhance significantly the PCM heat transfer and heat storage performance. To verify this and understand the PCM heat storage and releasement processes, a detailed 3D CFD model has been developed for the PCM HX and validated with measurements. The temperature variations and visualizations of the PCM during charging and discharging processes are therefore simulated and presented temporally. Furthermore, the effects of different inlet heat transfer fluid flow rates and temperatures on the PCM melting/solidification time are demonstrated in this study. Some significant simulation results have been obtained which can instruct efficiently the operation of the heat exchanger and its integration with the solar system.