槽式太阳能集热管换热特性分析  

Analysis of Heat Transfer Characteristics of Trough Solar Collector Tube

作　　者：吴玉庭[1] 董晓明 张灿灿 WU Yuting;DONG Xiaoming;ZHANG Cancan(Beijing University of Technology,Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Beijing Key Laboratory of Heat Transfer and Energy,Beijing,100124,China)

机构地区：[1]北京工业大学环境与生命学部,传热强化与过程节能教育部重点实验室,北京100124

出　　处：《工程热物理学报》2025年第4期1229-1243,共15页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51906003);内蒙古自治区科技重大专项(No.2021ZD0036)。

摘　　要：槽式太阳能集热器是槽式太阳能聚光集热器的关键部件之一,对其换热特性分析至关重要。本文分析了集热器内各部分能量转化情况,利用分布参数法建立了集热管的一维稳态、动态参数分布模型,模型计算结果与文献结果吻合较好,分析熔盐及各换热面温度、耗散率与熵产率、耗散热阻、散热量与换热量在集热管内部的沿程分布规律,熔盐进口温度、进口流量、日照辐射量等影响因素发生阶跃变化时熔盐出口温度、耗散率等物理参数的动态响应,以及各影响因素改变对物理参数的影响规律,结果表明:耗散率与熵产率在一定范围内呈现出相同的变化趋势,熔盐进口温度、熔盐进口流量以及日照辐射量三因素的变化对耗散率与熵产率的影响较为显著。Trough solar collector is one of the key components of trough solar collector,and it is very important to analyze its heat transfer characteristics.In this paper,the energy conversion of each part of the collector is analyzed,and the one-dimensional steady and dynamic parameter distri-bution model of the collector tube is established by means of the distributed parameter method.The distribution rules of the temperature of molten salt and each heat exchange surface,the entransy dissipation rate and entropy production rate,entransy dissipation thermal resistance,the heat dis-sipation and heat exchange in the collector tube were analyzed.When the influence factors such as molten salt inlet temperature,inlet flow rate and insolation radiation amount change step by step,the dynamic response of physical parameters such as molten salt outlet temperature and exuvial dissipation rate,and the influence law of each influence factor.The results show that the entransy dissipation rate and entropy production rate show the same change trend in the research range of this paper,and the changes of inlet temperature molten salt,inlet flow rate molten salt and solar radiation amount have significant effects on the entransy dissipation rate and entropy production rate.

关 键 词：槽式太阳能集热器 换热特性 分布参数 耗散率 熵产率 

分 类 号：TK172[动力工程及工程热物理—热能工程]