A new quantitative method for evaluating the impact of garden greening on outdoor thermal environment in summer - A case study of Japanese residential gardens

Garden greening can improve the outdoor thermal environment of buildings, but there is a lack of quantitative research on this aspect. First, this research quantitatively analyzes the effect of garden greening on the outdoor thermal environment by conducting field measurements at various distances from measurement points set up in a traditional Japanese residential garden during the summer, and a TDTE model was established. The results show that the outdoor thermal environment evaluation indices at each measurement point reach the maximum value of 13:00 daily. The outdoor thermal environment evaluation indices such as the average air temperature value at the nearest measurement point to the garden greening were 12 % lower than those at the farthest measurement point. Secondly, the TDTE model was established based on this foundation, and the validation of the measured data showed that the TDTE model had high reliability (the average RMSE value was 1.791, and the average MAPE value was 2.978). Finally, the model can provide ideas as well as the theoretical basis for quantitative research related to greening and outdoor thermal environments. This research provides scientific guidance for planning as well as reconstruction of residential garden greening.