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| Thermal Field Analysis of Trabeculeless Solar Aquaculture Greenhouse with Hollow Membrane |
| WEI Ying1,2, QIU Tianlong1,3, DU Yishuai1,3, CHEN Fudi1,2, XU Jianping1,2, LI Ye1,2, SUN Jianming1,3 |
1. Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China |
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Abstract Most greenhouses used in aquaculture are based on agricultural greenhouses, causing major problems such as significant difference in temperature between day and night, between air and water, and high temperature in greenhouses. In order to solve these problems, trabeculeless solar aquaculture greenhouse with hollow membrane was designed and constructed in this study. Methods including the computational fluid dynamics (CFD) simulation and field measurement were used to analyze the internal heat distribution and internal and external heat exchange in the greenhouse. The results showed that the thermal fields in the horizontal planes at different heights, in the east-west, north-south vertical planes, and inside the wall were unevenly distributed. In the horizontal, temperature in the north was higher than that in the south, showing that the top was the main heat source. In the east-west thermal field, the temperature in the east rose more rapidly than in the west, indicating that the east was the main heat source. The temperature reached the highest values on 48.9 ℃ at 0:00, 49.7 ℃ at 14:00, 45.8 ℃ at 13:00, and 56.2 ℃ at 13:00. After that, the heat input in the west was increased, and the temperature in the west was dropped more slowly than in the east. At night, the temperature variation between different locations was within 1 ℃. In the vertical, the temperature in the top was increased fastest and highest which showed that the top location was the main heat source during the daytime. Meanwhile, the thermal field was even at night and the soil heat radiation was the main heat source. In general, it can be deduced that the north wall insulation and air-water heat transfer are two factors affecting the greenhouse heat storage capacity.
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Received: 24 December 2019
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