Performance Test of Energy-saving Active Heat Storage Rear Wall in Solar Greenhouses in Qinghai

doi:10.3969/j.issn.1000-6362.2020.02.003

Abstract

Abstract: Taking advantage of the rich sand and soil resources in the non-cultivated land area in northwestern China, an active heat storage solidified sand wall solar greenhouse (SW) was built in Haidong City, Qinghai Province, and a passive heat storage solidified sand wall solar greenhouse (CK) was used as control. The thermal performance of the two was analyzed by experimental comparison. The results showed that compared with CK, the maximum temperature and average temperature in SW decreased by 2.3℃ and 1.5℃ on sunny days, respectively. On a clear night, the minimum and average temperatures in SW were 2.3℃and 1.8℃higher than CK, respectively. During cloudy day and night, the average temperature in SW was 1.8℃ and 2.7℃ higher than CK, respectively. On sunny days, the thickness of the thermal storage layer of SW was 520?720mm, which was greater than 320?520mm of CK, and the temperature difference between the time when the insulation was uncovered and when it was closed gradually decreased along the thickness of the rear wall. On a cloudy day, the thickness of the heat storage layer in the SW wall was 320-520mm, and the thickness of the heat storage layer in the CK wall was 120?320mm. Compared with sunny days, the thickness of the heat storage layer on the cloudy day was reduced. It was shown that the active heat storage solidified sand wall solar greenhouse (SW) can effectively increase the heat storage of the wall and increase the night temperature.

Key words: Active heat storage, Wall, Active heat storage and curing sand wall solar greenhouse(SW)

WU Zhao-xue，WANG Qiang，ZHANG Yong，ZOU Zhi-rong，YAN Lu-lu. Performance Test of Energy-saving Active Heat Storage Rear Wall in Solar Greenhouses in Qinghai[J]. Chinese Journal of Agrometeorology, 2020, 41(02): 86-93.

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