Passive cooling techniques as part of energy rehabilitation measures in office

This paper is focused on passive cooling techniques and especially on natural and hybrid ventilation as part of energy rehabilitation measures during an office renovation project. Natural, hybrid and mechanical ventilation was designed to decrease cooling demands and to obtain acceptable indoor air quality for the various needs. In some cases mixing of indoor and outdoor air was implemented. Air-draft problems were solved rearranging the type and the use of windows and using proper the air-grids. In order to select the proper ventilation type and characteristics, ventilation efficiency tests were performed for each area, according to the area population, taking to account the peak demands per space. The implemented passive cooling techniques include natural and hybrid ventilation during the night and the day and are combined with basic solar shading measures.