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植被屋顶以其良好的热工性能和特有的生态效应成为了建筑热工学当前的研究热点之一。在对植被屋顶进行能量分析时,植物光合作用消耗的能量一般被忽略。本文从理论上分析比较了屋顶植被光合作用和蒸腾作用消耗的能量,计算得出C3和C4植物光合作用消耗的能量不超过蒸腾作用消耗能量的3%,但CAM植物光合作用消耗的能量可以达到蒸腾作用消耗能量的5%~38%,因此这部分能量不能轻易忽略。在此基础上,本文提出了考虑光合作用时对既有屋顶植被冠层能量方程的理论修正方法。
Vegetation roof with its good thermal performance and unique ecological effects has become one of the hot topics in the field of building thermal engineering. In energy analysis of vegetation roofs, the energy consumed by plant photosynthesis is generally neglected. In this paper, the energy consumed by photosynthesis and transpiration of roof vegetation is analyzed and compared theoretically. The energy consumed by photosynthesis of C3 and C4 plants does not exceed 3% of the energy consumed by transpiration, but the energy consumed by CAM photosynthesis can reach Transpiration consumes 5% to 38% of energy, so this part of the energy can not be easily ignored. On this basis, this paper presents a theoretical correction method for the canopy energy equation of existing roof vegetation considering photosynthesis.