日本ヒートアイランド学会論文集 Vol.13 (2018)
Basic Experiments and Simulation for Symbiotic Evaporative Cooling Cladding
In this study, basic experiments and predictive calculations using a terracotta wine-cooling pot were performed to develop a cladding for evaporative cooling by internal water and to build a calculation model for predicting the performance. A terracotta panel with hollows for external wall cladding is already found in the market and possible development can be expected after some modification. Experiments on pots that accumulate water showed that the surface temperature was lower than ambient temperature by about 5 °C in a room with ambient temperature 20 °C and absolute humidity of 0.0044kg/kg'. The wetted area ratio of the outer surface of the pot filled with water was estimated to be 0.55 when the surface convective transfer coefficient of vertical wind velocity was 0.3 m/s. The results from the calculation model for predicting the evaporative cooling effect of the pot were consistent with the experimental results.
Sensitivity experiments for the factors of temperature decrease inhibition during winter night in urban area
We analyzed the factors of temperature decrease inhibition in urban area by sensitivity experiments of surface air temperature for changes of urban surface, using the Japan Meteorological Agency Non-Hydrostatic Model with the Urban Canopy scheme. Numerical experiments were performed in Kanto-Koshin area at a winter night in clear weather condition. For the control experiment, the urban heat island was well reproduced. The results of sensitivity experiments with various urban surface parameters were compared to those of the control experiment. The existence of buildings and its type effected mostly temperature decrease inhibition. From the experiment changed aspect ratio of buildings, the higher building inhibited temperature decrease than the lower building.