立管横截面和平板几何形状对自然条件下太阳能平板集热器热效率的影响

IF 0.9 4区 工程技术 Q3 ENGINEERING, MULTIDISCIPLINARY Journal of Engineering Research Pub Date : 2024-09-01 DOI:10.1016/j.jer.2023.100141
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引用次数: 0

摘要

本研究旨在提高太阳能平板集热器(SFPC)的热性能。为此,采用被动式技术研究了四种拟议的(SFPC)模型在瞬态太阳辐射下的热响应。其中两个模型模拟了不同立管配置的影响,即模型 A 和模型 B,分别代表半圆形和椭圆形截面。另外两个模型 -C- 和 -D- 表示板几何形状的影响,分别代表凹陷板和槽板。所有几何模型和数值模拟均使用 ANSYS 19.R3.R3 创建的。结果表明,数值模拟和实验结果非常吻合。此外,与传统模型相比,所有四个拟议模型都具有更好的热响应。此外,在所有其他正在研究的模型中,发现模型 -D- 是更好的模型,这是因为集热器的表面积增大,从而接收到更多的太阳辐射(热通量),从而增加了向直立管内工作流体的传热,提高了工作流体和容器内水的温度。与传统模式相比,D-模式在容器内工作流体温度和出口处水温方面的热响应分别高出约 13.2% 和 12.3%。此外,-D-型集热器的整体热效率比传统型高出约 13.7%。
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Effect of riser-pipe cross section and plate geometry on the solar flat plate collector's thermal efficiency under natural conditions
The current study aims to enhance the thermal performance of the Solar Flat Plate Collector (SFPC). To achieve that, four proposed models of (SFPC) were investigated in terms of thermal response under transient solar radiation using passive techniques. Two of these models simulate the influence of different riser-pipe configurations, namely models A and B, respectively representing semicircular and elliptical cross sections. While, the other two models, -C- and -D- represent the effect of plate geometry, which represent dimples and channel plates, respectively. All geometric models and the numerical simulations were created using ANSYS 19. R3. The results show that there is good conformity between numerical and experimental findings. Moreover, all four proposed models have been found to have a better thermal response than conventional model. Furthermore, model -D- is found to be the better model among all the other models under investigation due to the increased surface area of the collector, which leads to receive more solar radiation (heat flux) and hence increases the heat transfer to the working fluid within the riser pipe, which increases the temperature of the working fluid and the water inside the container. The thermal response of model -D- in terms of working fluid temperature inside the container and water temperature at the exit is approximately 13.2% and 12.3% higher, respectively, as compared to the traditional model. In addition, the overall thermal efficiency of the model -D- collector is approximately 13.7% higher than the conventional model.
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来源期刊
Journal of Engineering Research
Journal of Engineering Research ENGINEERING, MULTIDISCIPLINARY-
CiteScore
1.60
自引率
10.00%
发文量
181
审稿时长
20 weeks
期刊介绍: Journal of Engineering Research (JER) is a international, peer reviewed journal which publishes full length original research papers, reviews, case studies related to all areas of Engineering such as: Civil, Mechanical, Industrial, Electrical, Computer, Chemical, Petroleum, Aerospace, Architectural, Biomedical, Coastal, Environmental, Marine & Ocean, Metallurgical & Materials, software, Surveying, Systems and Manufacturing Engineering. In particular, JER focuses on innovative approaches and methods that contribute to solving the environmental and manufacturing problems, which exist primarily in the Arabian Gulf region and the Middle East countries. Kuwait University used to publish the Journal "Kuwait Journal of Science and Engineering" (ISSN: 1024-8684), which included Science and Engineering articles since 1974. In 2011 the decision was taken to split KJSE into two independent Journals - "Journal of Engineering Research "(JER) and "Kuwait Journal of Science" (KJS).
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