Dual-Roof Solar Greenhouse—A Novel Design for Improving the Heat Preserving Capacity in Northern China

Lilong Chai^1,2*, Baoju Wang^1,2, Mingchi Liu^1,2*, Zhanhui Wu^1,2, Yong Xu¹

¹National Engineering Research Center for Vegetables, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China.
¹National Engineering Research Center for Vegetables, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China; Key Laboratory of Urban Agriculture (North), Ministry of Agriculture, Beijing, China.
²National Engineering Research Center for Vegetables, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China; Key Laboratory of Urban Agriculture (North), Ministry of Agriculture, Beijing, China.

DOI: 10.4236/nr.2014.512059                

Abstract

Dual-roof solar greenhouse, a new style of solar greenhouse, was designed in this study intending to reduce heat loss in cold time and improve land use efficiency in Beijing, the Capital city of China. Designing and applying the dual-roof greenhouse in metropolitan area had dual effects of saving energy and enhancing land use efficiency. According to the monitoring study and analysis conducted in winter of 2012, the averaged night temperature of south room was about 12.1°C in December, which was satisfying for growing average leaf vegetables. Total energy saved by dual-roof in whole winter was quantified as 1.1 × 107 MJ.yr^-1 (winter), potentially about 37.4 t coal was saved in Beijing area during whole winter-growing period. Considering the application of north room, the land use efficiency was improved by 62.5% in dual-roof solar greenhouse.

Keywords

Agricultural Resource, Dual-Roof Greenhouse, Solar Energy, Land Use Efficiency, Heat Storage

Conflicts of Interest

The authors declare no conflicts of interest.

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