Prefabricated Heterogeneous Composite Wall Solar Greenhouse: Test and Analysis of Winter Application Effect

doi:10.11924/j.issn.1000-6850.casb2022-0333

Abstract

Abstract:

In order to solve the problems of traditional solar greenhouses such as poor resistance to natural disasters and low soil utilization efficiency, a new type of prefabricated heterogeneous composite wall solar greenhouse is proposed. The greenhouse is composed of a bone structure forming a load-bearing structure, and the wall is composed of a heat storage layer and an insulation layer, with a thickness of only 30 cm, which realizes the efficient use of land resources. This study mainly tested and analyzed the winter application effect of the greenhouse, and arranged 31 temperatures, 1 solar irradiance and 1 outdoor wind speed measurement point in the greenhouse and outdoor respectively. The results showed that under continuous cloudy days, the daily minimum air temperature range in the greenhouse was 6.5-8.9℃, the daily minimum temperature range of soil was 15.3-18.2℃, and the minimum temperature range of the internal surface of the greenhouse wall was 6.5-9.6℃, which were all maintained within the suitable growth temperature range of tomatoes. At the same time, the indoor temperature of the greenhouse was analyzed continuously for one month, and there was no temperature lower than the minimum tolerance temperature of tomatoes. The designed greenhouse has good thermal insulation and heat storage properties under the unfavorable condition of continuous cloudy days, which can realize the overwintering production of tomatoes. This study can provide a certain theoretical basis for the construction and development of prefabricated solar greenhouses and the selection of new composite wall materials.

Key words: solar greenhouse, prefabricated, composite walls, temperature, thermal performance

LI Yong, WANG Wenjing, QIE Lijuan, KANG Ligai, LIU Weibin, LI Mo. Prefabricated Heterogeneous Composite Wall Solar Greenhouse: Test and Analysis of Winter Application Effect[J]. Chinese Agricultural Science Bulletin, 2023, 39(9): 134-142.

Figures/Tables 14

References 27

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材料	厚度/ mm	密度/ (kg/m³)	导热系数/ [W/(m·K)]	建造工艺
石棉隔热板	60	140	0.10	不加设网格布，不做抗裂砂浆材料
复合保温砂浆	20	25	0.06	抹面
挤塑板	50	25	0.302	加设网格布，做抗裂砂浆
聚氨酯	50	25~50	0.024	现场喷涂

材料	厚度/ mm	密度/ (kg/m³)	导热系数/ [W/(m·K)]	建造工艺
石棉隔热板	60	140	0.10	不加设网格布，不做抗裂砂浆材料
复合保温砂浆	20	25	0.06	抹面
挤塑板	50	25	0.302	加设网格布，做抗裂砂浆
聚氨酯	50	25~50	0.024	现场喷涂

材料	厚度/mm	密度/(kg/m³)	蓄热系数/[W/(m²·K)]
用棚膜密封的稻草板	60	200	3.03
石棉隔热板	60	300	2.58
复合保温砂浆	20	25	1.07
挤塑板	50	25	0.54
聚氨酯	50	25-50	0.36

材料	厚度/mm	密度/(kg/m³)	蓄热系数/[W/(m²·K)]
用棚膜密封的稻草板	60	200	3.03
石棉隔热板	60	300	2.58
复合保温砂浆	20	25	1.07
挤塑板	50	25	0.54
聚氨酯	50	25-50	0.36

参数	测量范围	精度	湿度范围
R90V记录仪	0~50℃	±0.1℃	≤85% R·H
室外气象站（环境温度）	-40~70℃	±0.1℃	5%~95% R·H
室外气象站（风速）	0~60 m/s	±0.3 m/s	5%~95% R·H
室外气象站（太阳辐照量）	0~2000 W/m²	±5% W/m²	5%~95% R·H