Evaluation of climatically adapted performance of the settlement in Iwai Island

There are a lot of houses with stonewall called “Nerihei” in Iwai Island, Yamaguchi of Japan. This study observed the outdoor and indoor climates, and conducted the questionnaire survey for the residents. The wind velocities at center area of the settlement indicated lower level than the peripherals because the buildings are located closely and chaotically. The velocity was obviously lower and the air temperature was higher especially at the observation point enclosed by the Nerihei fence and house, and these led to make the thermal index ETU rise to higher. The rammed earth to bond the tiles to the rooftop moderated the outdoor thermal fluctuation effectively rather than Nerihei wall. The residents did not feel uncomfortable very much inside even if they frequently used techniques with lower energy consumption such as natural ventilation or clothing, not using air-conditioners.