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| 全玻璃真空管型太阳热水器内流场的CFD模拟 | |
| 引用本文： | 艾宁,樊建华,李育敏.全玻璃真空管型太阳热水器内流场的CFD模拟[J].北京航空航天大学学报,2008,34(10):1195-1199. |
| 作者姓名： | 艾宁 樊建华 李育敏 |
| 作者单位： | 1. 浙江工业大学 机电工程学院, 杭州 310032; 2. 丹麦技术大学 土木工程系, 哥本哈根; 3. 浙江工业大学 化学工程与材料学院, 杭州 310032 |
| 摘 要： | 全玻璃真空管型太阳热水器是技术相对成熟、应用最广的太阳能利用方式.通过对全玻璃真空管型太阳热水器内流场的计算流体力学模拟,研究了器内的对流换热过程,分析了真空管截面的流体流动速度分布,考察了真空管不同位置处的流体循环速度及箱体内水温对循环速度的影响.结果表明,随着流体温度的升高,器内出现随机的湍动涡流;涡流的存在将造成管内冷热流体的混和,对换热过程不利;在真空管内安置引流挡板将抑制流体的湍动,确保有序的热对流流动,提高对流换热效率.研究结果有助于剖析热水器内对流换热的机理,对技术革新提供参考. |
| 关 键 词： | 全玻璃真空管型太阳热水器 流场 计算流体力学(CFD) |
| 收稿时间： | 2007-09-25 |
CFD study of fluid flow in an all-glass evacuated tube solar water heater |
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| Ai Ning,Fan Jianhua,Li Yumin.CFD study of fluid flow in an all-glass evacuated tube solar water heater[J].Journal of Beijing University of Aeronautics and Astronautics,2008,34(10):1195-1199. | |
| Authors: | Ai Ning Fan Jianhua Li Yumin |
| Institution: | 1. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310032, China; 2. Dept. of Civil Engineering,Technical University of Denmark, Copenhagen; 3. College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032, China |
| Abstract: | The all-glass evacuated tube solar water heater is one of the most widely used solar thermal technologies.The aim of the paper is to investigate fluid flow in the solar water heater by means of the computational fluid dynamics(CFD).The investigation was carried out with a focus on the convective heat transfer in the tube.The buoyancy induced flow circulation in different parts of the tube was analyzed.It is shown that fluid flow becomes stochastic and turbulent if fluid temperature is high enough.The flow i... |
| Keywords: | all-glass evacuated tube solar water heater flow field computational fluid dynamic(CFD) |
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