摘要
设计并建造了阶梯形三连栋不对称屋面玻璃温室。北屋面仰角30°,使屋脊、天沟与北坡面,在立冬至立春的3个月弱光期内,阴影带宽度与对称屋面温室相比减少了0.82m;25°倾角的大南坡屋面,使整个温室的较大面积在冬季能够获得较高的太阳辐射。试验证明,该温室的透光率在60%～90%,平均为80%;光照的水平分布比较均匀;夏季温室阴影面积率为35%,冬季为40%。虽然冬季温室阴影面积率比夏季高,但其阴影下的光照强度仍然较高,能够满足作物生长对光照强度的需要。
A glass greenhouse of 3-span asymmetrical roofing was designed and built, which extended from east to west, and a big south roof and a small north one made it an asymmetrical roofing. The ridges went up gradually from south to north. The elevation angle of north roof was 30°, which made ridge, ditch and north roof form a very narrow weak zone during 3 months of weak light duration in winter. Shadow width reduced by 0. 82 m compared with that by a symmetrically roofing greenhouse. The elevation angle of south roof was 25°, which made the entire greenhouse receive more solar radiation in winter. The test results proved that light transmittivity of this greenhouse was 60%-90% and about 80% in average. Horizontal distribution of illumination was rather even. In summer, greenhouse shadow rate was lower, around 35%, but in winter, it was about 40%. Though greenhouse shadow rate was higher in winter than in summer, light intensity in shadow was still higher and could satisfy with the needs of crop growth for illumination.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2005年第11期106-109,共4页
Transactions of the Chinese Society for Agricultural Machinery
基金
北京市工厂化农业项目(项目编号:H020720030630)
关键词
玻璃温室
不对称屋面
结构设计
光照
Glass greenhouse, Asymmetrical roofing, Structure design, Illumination
