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Journal of Agriculture ›› 2019, Vol. 9 ›› Issue (5): 62-68.doi: 10.11923/j.issn.2095-4050.cjas18100014

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Monitoring Thermal Properties of Brick Wall Solar Greenhouse

  

  • Received:2018-10-22 Revised:2018-12-21 Accepted:2019-01-10 Online:2019-05-21 Published:2019-05-21

Abstract: The paper aims to understand the thermal properties of Chinese solar greenhouse with brick wall (CSG-bw) and provide support for the standardized design of CSG. The temperature and heat flux of CSG-bw of different time were analyzed. The results showed that: (1) the soil of 0-20 cm and the brick wall of 0-25 cm were the heat storage layer in the CSG-bw; (2) during the monitoring, the ratio of heat storage to the heat release per unit area for brick wall and soil was 58.5% and 42.8%, respectively; (3) the soil and wall of the CSG-bw could store heat during the day and release heat to the air indoor during the night, the released heat from the brick wall and soil to the indoor air was 3.5 and 6.9 MJ/m, respectively; the released heat from frontand back roof to the outdoor was 10.7 and 2.3 MJ/m, respectively, but the released heat from wall and soil was 0.64 MJ/m higher than the heat lost through front and back roof; (4) the external surface of CSG-bw kept releasing heat during the day, the ratio of heat released was 76.1%, 10.7%, 11.5% and 1.7% of the total heat released for the front, back roof, back wall and side wall at night, respectively, without considering other heat loss pathway. Base on the above results, it is proposed that the comprehensive engineering method should be used to improve thermal environment, which can reduce the cost of building of CSG-bw and store the heat reasonably.

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