期刊
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
卷 120, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.icheatmasstransfer.2020.105057
关键词
Nanofluid; Thermosyphon; Exergy; Energy efficiency; Entropy; Flat plate collector
The experimental results demonstrate that the parameters are strongly influenced by changes in solar irradiation. The highest collector thermal efficiency is achieved by using 1.0 vol% ND/water nanofluid, showing a 12.7% increase compared to pure water. Furthermore, the study reveals that the nanofluid is more sensitive to entropy generation than water as the working fluid.
The performance of flat plate solar collector was experimentally investigated using nanodiamond nanofluid that circulates in it under thermosyphon conditions. The nanofluids were prepared by adding nanodiamond (ND) nanoparticles at 0.2, 0.4, 0.6, 0.8 and 1.0% volume concentrations into the distilled water. The study was performed to analyze the collector thermal efficiency, exergy efficiency, entropy generation, heat transfer coefficient, friction factor and power consumption requirement in the test time interval between 10:00 a.m. to 16:30 p.m. The experimental results show that the trend of these parameters is strongly influenced by the changes of solar irradiation. The highest collector thermal efficiency of 69.85% is achieved by 1.0 vol% ND/ water nanofluid with 12.7% increase over that when pure water is used. Water as the working fluid generates a maximum entropy of 5.725 W/K, and this value drops to 5.541 W/K when 1.0 vol% ND/water nanofluid is used. Heat transfer irreversibility is shown by Bejan number to be the dominant contributor to the total entropy, and the entropy generation number shows that the ND/water nanofluid is more sensitive to entropy generation than water as the working fluid.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据