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在对植被屋顶进行热工性能研究时,绿化植物的发射率、长波辐射吸收率和太阳辐射吸收率是3个基本参数,对分析和计算植被屋顶的能量平衡有着重要意义。然而,目前学术界缺少常用绿化植物辐射特性的基本数据。本文研究了国内最常见的绿化物种——佛甲草的辐射特性,测得佛甲草叶片对太阳辐射的吸收率为0.67～0.69,发射率为0.81～0.84;同时利用太阳辐射传感器现场测得单位土地面积上密植的佛甲草草坪对太阳辐射的吸收率为0.83,估算得到其长波辐射吸收率约为1,在无进一步实验结果之前,可暂时认为单位土地面积上密植的佛甲草草坪发射率等同于叶片的发射率(0.83)。
When studying the thermal performance of vegetation roof, the emissivity, long-wave radiation absorption and solar radiation absorption of the greenery are three basic parameters, which is of great significance for the analysis and calculation of the energy balance of the vegetation roof. However, at present, the academic community lacks the basic data on the radiation characteristics of common green plants. In this paper, we studied the radiation characteristics of the most common greening species, Phragmites australis. The results showed that the absorption rate of solar radiation of Phragmites communis was 0.67-0.69 and the emissivity was 0.81-0.84. Per unit area of the land on the densely planted lawn grass on the solar radiation absorption rate of 0.83, estimated long-wave radiation absorption rate of about 1, without further experimental results, can be tentatively that the unit area of ?? land planted on the lawn grass The emissivity is equivalent to the emissivity of the blade (0.83).