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Multi-Span Greenhouse Energy Saving by External Insulation: System Design and Implementation

文献类型： 外文期刊

作者： Guan, Wenfei 1 ; Guo, Wenzhong 1 ; Chen, Fan 3 ; Han, Xiaobei 1 ; Wang, Haiguang 4 ; Sun, Weituo 2 ; Zhao, Qian 2 ; Jia, Dongdong 2 ; Wei, Xiaoming 2 ; Zhu, Qingzhen 1 ;

作者机构： 1.Jiangsu Univ, Sch Agr Engn, Zhenjiang 212013, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Res Ctr Intelligent Equipment, Beijing 100097, Peoples R China

3.Ningxia Acad Agr & Forestry Sci, Yinchuan 750002, Peoples R China

4.Shouguang Agr Dev Grp Co Ltd, Weifang 262700, Peoples R China

关键词： multi-span greenhouse; thermal blanket; external insulation; system design; thermal insulation performance

期刊名称：AGRICULTURE-BASEL （ 影响因子：3.6； 五年影响因子：3.6 ）

ISSN：

年卷期： 2024 年 14 卷 2 期

页码：

收录情况： SCI

摘要： To address the issues of excessive heat loss from the roofs of multi-span greenhouses and high energy consumption for heating during winter production, we propose an approach for the external insulation of the roof of multi-span glass greenhouses and have developed an external insulation system (EIS) to practice this approach. The system achieved full coverage of the greenhouse roof through mechanized unfurling and furling of external thermal blankets, thereby achieving energy-saving insulation. This paper describes the overall design and working method of the EIS, providing detailed design and structural parameters for critical components such as the traction rope transmission mechanism and the rail-type sealing structure. Through a system verification experiment, the specifications of the traction rope were determined and the rationality of the EIS's thermal blanket unfurling and furling time was confirmed. An insulation performance experiment indicated that the average heat flux of the greenhouse roof covered with the external thermal blanket over 14 continuous nights was 54.2 W/m2, compared with 198.6 W/m2 for a single-layer glass roof. Covering the roof with the external thermal blanket reduced heat loss from the glass roof by 72.7%. The average heat flux of the roof of the Venlo-type multi-span greenhouse with double-layer internal insulation was 99.9 W/m2 during the same period, indicating that the heat loss from the roof using external insulation was only 50.3%. This study provides a novel thermal insulation approach and an energy-saving system for multi-span greenhouses.

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