Passive – a tool that calculates the energy demand of buildings on monthly or annual basis powered by WUFI® technology and used as a certification software worldwide.

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Passive calculates the energy demand of buildings on monthly or annual basis powered by WUFI® technology. Thereby transmission, ventilation, radiation, and inner loads are considered. The energy gains and losses are balanced and a detailed input of the heating, ventilation, and air conditioning systems (HVAC) allows the calculation of final energy. Depending on the energy sources used the primary energy is determined. Passive enables a double assessment of buildings. On the one hand a monthly energy balance method is used to check if the buildings meet the Passive House criteria. On the other hand, the same building model can be used for a detailed dynamic assessment of the hygrothermal behavior of building and components in combination with ‹ Plus. Potential ways to reduce the energy demand of the buildings can be determined. An analysis of comfort conditions in several zones of the building as well as the development of strategies to avoid moisture related problems in the building components is possible. By combining the monthly balance and the dynamic method Passive Houses can be designed which are optimally adapted to the respective outdoor climate conditions while ensuring comfortable indoor conditions.