The test lecture rooms on Katholieke Universiteit Leuven (KU Leuven) Ghent Technology\nCampus (Belgium) are a demonstration case of Annex 62: Ventilative Cooling of the International\nEnergy Agencyâ??s Energy in Buildings and Communities programme (IEA EBC). The building is\ncooled by natural night ventilation and indirect evaporative cooling (IEC). Thermal comfort and the\nperformances of ventilative cooling are evaluated. Long-term measurements of internal temperatures,\noccupancy, opening of windows and IEC were carried out in the cooling season of 2017. The airflow\nrates through the windows in cross- and single-sided ventilation mode were measured by both tracer\ngas concentration decay and air velocity measurements. In addition, the air flow pattern is visualized\nby measuring air temperatures in the room. The results show that good thermal summer comfort was\nmeasured except during heat waves and/or periods with high occupancy. Both nighttime ventilation\nand IEC operate very well. IEC can lower the supply temperature by day significantly compared to\nthe outdoor temperature. The Air Changes Rates (ACR) of the night ventilation greatly depends on\nwind direction and velocity. The air temperature profile showed that the air is cooled down in the\nwhole lecture but more in the upper zone. The extensive data monitoring system was important to\ndetect malfunctions and to optimize the whole building performance.
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