Numerical Calculation on the Effects of Night Purge in Loft Space during Summer on Room Temperature and Cooling Load

Numerical simulation was carried out using multi-zone heat calculation program TRNSYS, the effects of night purge in loft space during summer on room temperature and cooling load were compared among six cities in Japan. The room temperature reduction effect of night purge was remarkable between 10 times/h and 50 times/h of ventilation rate, and not so much when the ventilation rate was between 50 times/h and 200 times/h. It was found that increasing the size of the loft window or providing it face-to-face during night purge slightly reduces the room temperature at night, but increases the room temperature during the day. It was also found that as the nighttime ventilation rate increased in both August and September, the cooling load decreased.
長崎大学大学院工学研究科研究報告, 51(97), pp.33-38; 2021