Fan Zilong, Liu Xingan, Yue Xiang, Zhang Lei, Xie Xiaoyu, Li Yiming, Li Tianlai
Key Laboratory of Protected Horticulture, Shenyang Agricultural University, Ministry of Education, No. 120 Dongling Road, Shenhe District, Shenyang 110866, People's Republic of China.
National and Local Joint Engineering Research Center of Northern Horticultural Facilities Design and Application Technology (Liaoning), Shenyang Agricultural University, No. 120 Dongling Road, Shenhe District, Shenyang 110866, People's Republic of China.
R Soc Open Sci. 2021 Dec 22;8(12):211217. doi: 10.1098/rsos.211217. eCollection 2021 Dec.
In order to optimize the heat preservation capacity of Chinese solar greenhouse (CSG) and further reduce energy consumption, we clarified the mechanism of the external thermal insulation layer that affects the microclimate environment of CSG. The most suitable external insulation layer thickness (EILT) of the solar greenhouse envelope structure in high latitude and cold region has been indicated. A three-dimensional mathematical model was developed based on computational fluid dynamics and verified using experimental measurement. The temperature variations, heat variations and economic benefit were analysed. The results indicated that covering the outer surface of the enclosures with a thermal insulation layer could effectively increase the greenhouse temperature by 1.2-4.0°C. The influence degree of the external thermal insulation layer on the greenhouse microclimate was as follows: sidewall (SW) > north wall (NW) > north roof (NR). In high-dimensional and cold areas, covering the outer surface of all enclosures with insulation layer as the suitable solution could raise the greenhouse air temperature maximally. The suitable EILT of each maintenance structure was obtained as follows: NW 80 mm, SW 80 mm, NR 100 mm.
为了优化中国日光温室（CSG）的保温能力并进一步降低能耗，我们阐明了影响CSG微气候环境的外保温层的作用机制。指出了高纬度寒冷地区日光温室围护结构的最合适外保温层厚度（EILT）。基于计算流体动力学建立了三维数学模型，并通过实验测量进行了验证。分析了温度变化、热量变化和经济效益。结果表明，用保温层覆盖围护结构的外表面可有效使温室温度提高1.2 - 4.0°C。外保温层对温室微气候的影响程度如下：侧壁（SW）＞北墙（NW）＞北屋顶（NR）。在高纬度寒冷地区，用保温层覆盖所有围护结构的外表面作为合适的解决方案可最大程度提高温室空气温度。各维护结构的合适EILT如下：NW 80毫米，SW 80毫米，NR 100毫米。
