Applying night ventilation techniques in office buildings.

In this paper the potential of night ventilation techniques is investigated. Extended real scalemeasurements have been performed, in three buildings, under free floating and airconditioned operation. Two of the buildings have been studied by using a theoretical modeldeveloped in TRNSYS [1] software. Simulation results have been validated by using themeasured data. Specific studies concerning the indoor air temperature and the cooling load ofthe buildings have been carried out in order to identifj the influence of night ventilationtechniques on the buildings thermal performance. A sensitivity analysis, for various air flowrates during night ventilation, have been performed for one of the studied buildings. Theimpact of night ventilation on the cooling load (for A/C operation) and indoor temperature(for free floating operation) is studied as well. A significant impact of night ventilation inbuildings of high thermal mass is found.