JAUE2018-059 Research on Utilization of Underground Malls as Shelters for Major Natural Disasters -Part 3- Study on sleep experiment on hypothetical evacuees staying in underground malls under operation stop of air-conditioning

Abstract

In this report, measurement of the thermal environment and sleep experiments were conducted to clarify sleep quality and fatigue of evacuees of disasters who stayed overnight in underground malls under the condition of stopped operation of air-conditioning. The experiments were conducted in two underground malls in Fukuoka City, Japan, during each season of 2017. As a result, temperature and humidity in the underground malls during the night in summer were around 28°C and 70% to 80%, similar to those of outdoor air. In the intermediate season, despite outdoor air temperatures ranging from 12°C to 17°C, the indoor temperature was 22°C to 24°C. In winter, although outdoor temperatures were between 1°C and 6°C, the indoor temperature was 13°C to 15°C. Regarding sleep quality, it was clarified that in summer, the thermal environment in the underground malls during the night is too hot to fall into deep sleep easily. On the other hand, in winter, the temperature is too cold to maintain sleep. Accordingly, it is desirable that proper indoor airflow is added in summer, or indoor temperature is at least maintained above 20°C in winter, so that evacuees are able to sleep well in the underground malls.