| 马进伟,李葱,方浩,杜涛.太阳能集热器空气/水双循环换热特性模拟研究[J].安徽建筑大学学报,2022,30(): |
| 太阳能集热器空气/水双循环换热特性模拟研究 |
| Simulation Study on Heat Transfer Characteristics of Solar Collector with Air/Water Dual Circulation |
| 投稿时间：2021-04-06 修订日期：2021-05-12 |
| DOI： |
| 中文关键词: 太阳能 集热器 数值模拟 换热 热效率 |
| 英文关键词: solar energy collector numerical simulation heat transfer thermal efficiency |
| 基金项目:十三五国家重点研发计划项目（2017YFC0702600）;创新项目（GXXT—2019—019）；中国科协优秀中外青年交流计划（2019年度）；安徽省重点研究与开发计划项目 （202004a07020049）；国家自然科学基金项目（51606002）；安徽省高校自然科学研究项目（KJ2020JD15） |
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| 中文摘要: |
| 摘要：太阳能集热器通过吸收太阳辐照能加热水和空气，实现太阳能的光热利用。为进一步探究集热器的集热性能，利用CFD技术对水集热、空气集热、空气-水复合集热过程进行数值模拟，研究换热工质在不同温度、流速条件下的集热特性。辐照度800 W/m2的模拟工况显示：水集热模式下，随着水流速度的增加，集热效率不断升高，流速0.1 m/s、入口温度290 K时热效率最高，可以达到74.73%，；空气集热模式下，流速1.0 m/s、入口温度300 K时集热效率最佳，为51.74%；复合集热模式下，水集热和空气集热过程存在相互制约的关系，空气、水流速分别0.5 m/s 、0.1 m/s，入口温度300 K时，综合热效率最高，达到71.66%。从能量利用效率角度分析，水集热模式适用于春秋两季；空气集热模式适用于冬季；空气-水复合集热模式适用于夏季。 |
| 英文摘要: |
| Abstract: The solar collector heats water and air by absorbing solar radiation energy to realize the photothermal utilization of solar energy. In order to further explore the thermal performance of the solar collectors, CFD technology was used to simulate the process of water heat collect, air heat collect and air-water composite heat collect to study the heater characteristics of heat transfer medium at different temperatures and flow rates. The simulation under the condition of irradiance of 800 w/m2 shows that: in the water heat collect mode, with the increasing of water flow velocity, the thermal efficiency of water increases continuously, and the maximum thermal efficiency can reach 74.73% when the flow velocity is 0.1 m/s and the inlet temperature is 300 K; in the air heat collect mode, the heater efficiency can reach 51.74% maximum when the flow velocity is 1.0 m/s and the inlet temperature is 290 K ;In the composite heat collect mode, there is a mutual restriction between water heat collect and air heat collect. when the inlet temperature is 300 K, the velocity of air is 0.5 m/s and the velocity of water is 0.1 m/s respectively, the comprehensive performance is the best state under which the thermal efficiency is 71.66%. From the perspective of energy utilization efficiency, the water heat collect mode is suitable for spring and autumn; The air heat collect mode is suitable for winter; The air water composite heat collect mode is suitable for summer.
Key words: solar energy; collector; numerical simulation; heat transfer; thermal efficiency |
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