微热管阵列平板太阳能集热器中空保温层厚度优化  

Optimization of hollow insulation layer for flat plate solar collector based on micro heat pipe array

作　　者：邓月超[1] 赵耀华[1] 全贞花[1] 刘中良[2] 

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]北京工业大学环境与能源工程学院,北京100124

出　　处：《农业工程学报》2015年第5期268-274,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：北京市博士后工作经费资助项目(2014ZZ-34);中国博士后科学基金资助项目(2014M550578)

摘　　要：为分析微热管阵列平板太阳能集热器的热性能，该文建立了集热器的CFD模型，对其进行数值模拟，将模拟结果与试验结果进行对比，验证了模型的可靠性。采用该CFD模型对集热器保温层厚度进行优化，结果表明，当实心保温层导热系数分别为0.02、0.03、0.04、0.05 W/（m·K）时，优化的实心保温层厚度分别为4.5、5.0、5.5、5.5 cm。合理设计的中空保温层（空气层与实心保温层相结合的保温层形式）集热器能够达到与实心保温层集热器相当的保温隔热效果，同时可使集热器保温层成本及质量降低25%～50%。最后，该文给出了保温层总厚度分别为4、5、6 cm时的中空保温层厚度优化结果，为该类集热器保温层的设计提供了理论依据。In this paper, a three-dimensional CFD numerical model of heat transfer and fluid flow was developed to simulate the thermal performance of the novel flat plate solar collector based on a micro heat pipe array to provide a＆amp;nbsp;theoretical basis for the structure improvement and optimization of the collector. The simulation of the novel collector with water flow included the CFD modeling of solar irradiation and the modes of mixed convection and radiation heat transfer between the absorber plate and glass cover, as well as the heat transfer in the circulating water inside the heat exchanger and conduction of the insulation. The fluid flow and heat transfer in the computational domain satisfied the continuity equation, the momentum equation, and the energy equation. The standardk-ε two-equation turbulence model was used in this paper. In order to predict the direct illumination energy source that results from incident solar radiation and the radiation field inside the collector, the discrete ordinate radiation model with a solar ray-tracing model was used. A commercial computational fluid dynamics program （Fluent 6.3 CFD software） was used to solve the coupled fluid flow, heat transfer, and the radiation equation. The solver used is the segregated solver. Body Force Weighted was selected as the discretization method for pressure, and the SIMPLE algorithm was used to resolve the coupling between pressure and velocity. The discretization methods for the solving of momentum, energy, radiation, and turbulence were second order upwind. The thermal performance could be achieved by simulation results under different conditions. Then, the experimental and numerical results were compared to validate the prediction of the CFD model. The results showed that the numerical results of the thermal efficiency of the novel collector were in reasonable agreement with the experimental data. The validated CFD model was used to analyze the properties of the insulation layer. First, the effects of the thickness of solid insu

关 键 词：太阳能 优化 热传递 微热管阵列平板集热器 中空保温层 厚度 CFD模拟 瞬时效率 

分 类 号：TK515[动力工程及工程热物理—热能工程]