流量对抛物面槽式太阳能集热器传热特性影响的实验分析

doi:10.12096/j.2096-4528.pgt.21072

发电技术 ›› 2021, Vol. 42 ›› Issue (6): 665-672.DOI: 10.12096/j.2096-4528.pgt.21072

流量对抛物面槽式太阳能集热器传热特性影响的实验分析

徐立¹^,²^,³^,⁴(), 孙飞虎¹^,²^,³^,⁴(), 李钧¹^,²^,³^,⁴(), 张强强²^,³()

¹ 中国科学院太阳能热利用及光伏系统重点实验室, 北京市海淀区 100190
² 中国科学院电工研究所, 北京市海淀区 100190
³ 中国科学院大学, 北京市海淀区 100049
⁴ 北京市太阳能热发电工程技术研究中心, 北京市海淀区 100190

收稿日期:2021-06-01 出版日期:2021-12-31 发布日期:2021-12-23
作者简介:徐立(1984), 男, 博士, 副研究员, 研究方向为太阳能集热器和吸热器性能、电子器件散热和电池热管理等, xuli1@mail.iee.ac.cn
孙飞虎(1980), 男, 博士, 助理研究员, 研究方向为太阳能定日镜跟踪质量诊断、定日镜场跟踪校正和聚光能流密度分布测量等, sunfeihu@mail.iee.ac.cn
李钧(1974), 男, 博士, 助理研究员, 研究方向为太阳能热发电及废物清洁处理等, lijun@mail.iee.ac.cn
张强强(1986), 男, 博士, 副研究员, 研究方向为太阳能吸热器性能评价和太阳能热化学等, zhangqiangqiang@mail.iee.ac.cn
基金资助:
国家重点研发计划项目(2018YFB0905102)

Experimental Analysis of the Influence of Flow Rate on Heat Transfer Characteristics of Parabolic Trough Solar Collector

Li XU¹^,²^,³^,⁴(), Feihu SUN¹^,²^,³^,⁴(), Jun LI¹^,²^,³^,⁴(), Qiangqiang ZHANG²^,³()

¹ Key Laboratory of Solar Thermal Energy and Photovoltaic System, Chinese Academy of Sciences, Haidian District, Beijing 100190, China
² Institute of Electrical Engineering, Chinese Academy of Sciences, Haidian District, Beijing 100190, China
³ University of Chinese Academy of Sciences, Haidian District, Beijing 100049, China
⁴ Beijing Engineering Research Center of Solar Thermal Power, Haidian District, Beijing 100190, China

Received:2021-06-01 Published:2021-12-31 Online:2021-12-23
Supported by:
National Key Research and Development Program of China(2018YFB0905102)

摘要/Abstract

摘要：

抛物面槽式太阳能集热器被广泛应用于中温太阳能工业热利用和高温太阳能热发电领域，然而太阳能间歇性的固有缺陷与供能系统期望的稳定连续运行相悖。通常通过调节流量使变太阳辐照条件下运行的槽式集热器提供相对稳定的有用能量输出，进而对其下游设备的稳定性起着关键作用。为了研究流量变化对集热器瞬态热行为的影响，通过人工调节造成流量的阶跃变化来开展实验，并且研究分析了在不同流量下的雷诺数、努塞尔数和传热流体对流换热系数。

关键词: 太阳能热发电, 碳达峰, 碳中和, 温室气体排放, 抛物面槽式太阳能集热器, 传热特性, 对流换热系数

Abstract:

The parabolic trough solar collector is a commercialized and mature concentrating solar collector, which is widely used in the field of medium temperature solar industrial heat utilization and high temperature solar thermal power generation. However, the inherent drawback of solar energy is contrary to the stable and continuous operations expected by the energy supply system. Usually, adjusting the flow rate of the heat transfer fluid is a method to let the collector provide a relatively stable output under varying solar irradiation conditions, which plays a key role in the stability of its downstream equipments. In order to clarify how the change of flow rate affects the transient thermal behaviors of the collectors, this study carried out experiments with the step-change of the flow rate by the manual adjustment, and then carried out the analysis of Reynolds number, Nusselt number and the convective heat transfer coefficient of the heat transfer fluid with different flow rates.

Key words: solar thermal power generation, carbon peak, carbon neutrality, greenhouse gas emission, parabolic trough solar collector, heat transfer characteristics, convective heat transfer coefficient

中图分类号:

TK513.1

徐立, 孙飞虎, 李钧, 张强强. 流量对抛物面槽式太阳能集热器传热特性影响的实验分析[J]. 发电技术, 2021, 42(6): 665-672.

Li XU, Feihu SUN, Jun LI, Qiangqiang ZHANG. Experimental Analysis of the Influence of Flow Rate on Heat Transfer Characteristics of Parabolic Trough Solar Collector[J]. Power Generation Technology, 2021, 42(6): 665-672.

图/表 5

图1 实验使用的抛物面槽式太阳能集热器

Fig.1 Parabolic trough solar collectors used in the experiment

图2 测量数据

Fig.2 Measured data

图3 传热流体的导热系数k、密度ρ和比热容c随温度的变化

Fig.3 Thermal conductivity k, density ρ and specific heat capacity c of heat transfer fluid as a function of temperature

图4 传热流体的运动黏度ν、热扩散率α和普朗特数Pr随温度的变化

Fig.4 Kinematic viscosity ν, thermal diffusivity α and Prandtl number Pr of heat transfer fluid as a function of temperature

图5 基于集热器出口温度的Re，Nu和hHTF

Fig.5 Re, Nu and hHTF based on the collector outlet temperatures

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流量对抛物面槽式太阳能集热器传热特性影响的实验分析

Experimental Analysis of the Influence of Flow Rate on Heat Transfer Characteristics of Parabolic Trough Solar Collector

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