Installation of air conditioner in school gymnasium is proceeding gradually for avoiding heatstroke and preparing evacuation sites. The measurements of temperature, humidity and CO2 concentration were conducted in two school gymnasiums with air conditioners in operation for determining condition of air conditioner use. The air conditioners were installed in these two gymnasiums just before starting the measurements in summer of 2019. The measurements continued for two years. One gymnasium was well insulated, and another less insulated. Temperature drop by air conditioner use and degree hours while air conditioner in operation were calculated based on the measured data.
As a result, the following points were obtained.
1) There were some differences in insulation characteristics, air conditioner operation frequency, air conditioner operation time per one operation between two gymnasiums, and those had an influence on the measured room temperature.
2) The thermal performance of the gymnasiums during the air conditioner in operation was estimated by using degree hours during air conditioner in operation (DHAC). It was found that the DHAC per one operation for F school gymnasium which was well insulated, was lower than that of O school.
3) Heatstroke cases that occurred at secondary and high schools located in seven Japanese cities, i.e., Sendai, Tokyo, Nagoya, Osaka, Hiroshima, Fukuoka, and Kumamoto, were linked to the meteorological data point acquired from the nearest meteorological station where the accident of heatstroke occurred. And the relationship between the outdoor temperature and heatstroke occurrence was determined. As a result, heatstroke occurrence estimated by the mean degrees during air conditioner in operation (MD) for F school gymnasium, which was well insulated, was 44 % of that of O school.
The influence of air conditioner installment to gymnasiums on the whole power consumption of the measured schools was not dominant.