The field experiment with the rooftop green was tested to confirm the energy serving on the air-conditioner.The two prefabrication rooms set on the housetop at the ATEC in Gunma University. The greening was constructed to the rooftop of one of the rooms, and another rooftop was no changed. The temperatures were measured with K type thermocouple at the inside of the mat, roof, ceiling, several points in the room, and floor. The electric power of the air-conditioner was also recorded. The roof temperature of the greening room became smaller than that of another one. By using roof green, the electric power of the air conditioner decreased 16% in a day against the non-greening room. Furthermore, the power saving effect through August was reached until 11%.

It is scorching hot in urban area under the strong sunshine of the summer. It is because that the surface temperature of the urban area is higher than the rural and the thermal radiant environment is poor. This poor environment in urban area can be greatly improved by fractal sunshades. The sunshade consists of many units of Sierpinski’s tetrahedron which has the almost same fractal dimension as trees. This paper shows results of comparative measurements of radiant environment in visual, near-infrared and thermal infrared bands under the fractal sunshade and a parasol. The results showed that the MRT under the sunshade was lower by 17 degree than that under the parasol. Furthermore, some sensory tests and long term measurements showed some results favorable to the sunshade.

In this study, we tried to examine the actual condition of urban heat island at typical summer nights in Kofu basin by analyzing the nocturnal temperature at fixed observation points. In order to examine the spatial characterization of thermal environment, 38 observation points were divided into four groups, and respectively analyzed the number of hot summer nights day, temperature depression during nights, and mean temperature in each group. In addition, mean nocturnal temperature of each time was mapped by interpolating the data at fixed observation points. From these analyses, it was found that the hotter area remains until early morning and hot summer nights occur more frequently around the center of Kofu basin. On the other hand, in the west and east part of Kofu basin, the number of hot summer nights day is smaller and the range of temperature depression is higher. This is because the ratio of artificial land cover and the effects of rivers and terrain are different from each group.

A field experiment with a rooftop green on a prefab container was performed to compare with an electric power saving effect on an air-conditioner in winter season. The two prefabs were set on the housetop of the ATEC in Gunma University to compare the rooftop green effect to the building. In this experiment the temperatures at an atmosphere, rooftop, ceiling, and inside of the prefab were recorded with the thermocouple. The electric power of the air-conditioner was also recoded. The electric power on the prefab with the rooftop green became larger than that without rooftop green, because the textile mat for the rooftop green had been cooled while the nighttime. Then, large electric power was spent to increase of the room temperature.

This paper discusses a pavement body configuration of the evaporative cooling pavement system. The evaporative cooling duration of pavement systems, which were designed with a focus on rainwater retention and capillary absorption, was investigated through a summer outdoor experiment. The results from this experiment showed the following: (1) Surface temperature of a system which has pavement blocks with arched void kept low for 14 days or longer. The difference between the surface temperature and air temperature were below 5 degrees C in the daytime. It is because the water retention capacity is enough and the distance of pavement surface and waterproof layer is shorter than the pavement capillary absorption height. (2) Evaporative cooling duration of pavement systems with a thick roadbed was about 5 days. It shows that there is stay water (not used for evaporative cooling) in the system after capillary absorption channel from the pavement downside to the surface are disrupted.