Experimental study on night ventilation to improve thermal environment in office rooms

An experimental study on night ventilation was carried out in Harbin to improve thermal environment in office rooms. Some physical data were measured continuously, such as indoor air temperature and outdoor air temperature. At the same time, the relative humidity and surface temperature were tested. The results showed that for the northern office rooms, the length of operation time of air conditioner was reduced by 2.75 hours per day, with using night ventilation technology. And thus the energy could be saved 4.95 KWh per day. The operation fees could decrease 0.073 yuan per square meter per day for the whole office building. And the principle of night ventilation was given.