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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Numerical analysis of a hybrid tubular and cavity air receiver for solar thermal applications
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Numerical analysis of a hybrid tubular and cavity air receiver for solar thermal applications

机译：用于太阳能热应用的混合管状和腔空气接收机的数值分析

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摘要

Purpose - This paper aims to deal with characterisation of the thermal performance of a hybrid tubular and cavity solar thermal receiver. Design/methodology/approach - The coupled optical-flow-thermal analysis is carried out on the proposed receiver design. Modelling is performed in two and three dimensions for estimating heat loss by natural convection for an upward-facing cavity. Heat loss obtained in two dimensions by solving coupled continuity, momentum and energy equation inside the cavity domain is compared with the loss obtained using an established Nusselt number correlation for realistic receiver performance prediction. Findings - It is found that radiation emission from a heated cavity wall to the ambient is the dominant mode of heat loss from the receiver. The findings recommend that fluid flow path must be designed adjacent to the surface exposed to irradiation of concentrated flux to limit conduction heat loss. Research limitations/implications - On-sun experimental tests need to be performed to validate the numerical study. Practical implications - Numerical analysis of receivers provides guidelines for effective and efficient solar thermal receiver design. Social implications - Pressurised air receivers designed from this method can be integrated with Brayton cycles using air or supercritical carbon-dioxide to run a turbine generating electricity using a solar heat source. Originality/value - The present paper proposes a novel method for coupling the flux map from ray-tracing analysis and using it as a heat flux boundary condition for performing coupled flow and heat transfer analysis. This is achieved using affine transformation implemented using extrusion coupling tool from COMSOL Multiphysics software package. Cavity surface natural convection heat transfer coefficient is obtained locally based on the surface temperature distribution.
机译：目的 - 本文旨在应对混合管状和腔太阳能热接收机的热性能的表征。设计/方法/方法 - 在所提出的接收器设计上进行耦合的光流量分析。建模在两个和三个维度中进行，用于估计通过对面对向上腔的自然对流的热量损失。将腔域内的耦合连续性，动量和能量方程求解腔域内的动量和能量方程获得的热量损失与使用建立的露天数相关性获得的损耗，以便现实接收器性能预测。结果 - 发现从加热腔壁到环境温度的辐射发射是从接收器中的热损失的主导模式。研究结果建议，必须将流体流动路径与暴露于浓缩通量照射的表面相邻，以限制传导热量损失。需要进行研究限制/含义 - 需要进行阳光实验测试以验证数值研究。实际意义 - 接收器的数值分析为有效和高效的太阳能热接收机设计提供了指导。社会影响 - 由该方法设计的加压空气接收器可以使用空气或超临界二氧化碳与布雷顿循环集成，以使用太阳能热源运行涡轮发电电力。原创性/值 - 本文提出了一种用于从射线跟踪分析耦合磁通贴图的新方法，并将其用作用于执行耦合流动和传热分析的热通量边界条件。这是使用使用COMSOL Multiphysics软件包的挤压耦合工具实现的仿射变换来实现的。基于表面温度分布，在局部地获得腔表面自然对流传热系数。

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