Research >> 3. Environmentally Sustainable Buildings >>Effect of greens around residential buildings on their outdoor thermal environment

■ Effect of Greens around Residential Buildings on Their Outdoor Thermal Environment

□ A Study on the Effect of Trees Around Residential Buildings on their Outdoor Thermal Environment

Purposes of This Study
High density land use in many cities has caused an uncomfortable urban environment, which directly influences the thermal environment in outdoor space around residential buildings. In order to improve the urban thermal environment, utilization of cooling effect of green areas has been increasing is observed.
 The purposes of this study are 1) to investigate the effect of transpiration and evaporation of trees on the thermal emvironment in the areas around residential buildings surrounded by trees, 2) to compare the simulated andmeasured results about transpiration rate of trees with modeling stomatal conductance on leaves.

Figure-1 Scene of Measurement Figure-2 Measurement of the transpiration
 and evaporation of trees

Results of This Study
The outdoor thermal environment around a residential with trees was measured in summer, and the following results were obtained.
 1) Trees are effective in moderating outdoor air temperature after rainfall.
 2) The water evaporation rate from the ground in a tree shade area is 1/3 to 1/2 of that in a sunny area.
 Parameters of model stomatal conductance were determined using the data of a deciduous tree measured by stem flow.