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A new passive house design tool and its application in cold climates

: Antretter, Florian; Fink, Marcus

Arfvidsson, Jesper (Ed.) ; Univ. Lund:
NSB 2014, 10th Nordic Symposium on Building Physics : 15-19 June 2014, Lund, Sweden; Full Papers
Lund, 2014
ISBN: 978-91-88722-53-9
Nordic Symposium on Building Physics (NSB) <10, 2014, Lund>
Fraunhofer IBP ()

Due to an increasing demand for sustainable low energy buildings, the application of the passive house design methodology spreads worldwide. The methodology applied to balance monthly heat gains and losses is developed for fast energy demand investigations in moderate climates; issues can occur in other climate zones. Furthermore, the hygrothermal effects within the building and the building components are neglected. The monthly method is not suitable for moisture relevant risk management, nor is it for transient effects that influence the building energy performance. This leads to the requirement of a dynamic simulation.
A new user friendly software tool is available that couples the established passive house design methodology, for quite instant energy demand simulation results, with an sophisticated hygrothermal dynamic simulation. The dynamic whole building simulation is based on a detailed building component model simulating the coupled heat and moisture transfer and a multi-zone building model, calculating hourly indoor climate and energy demand.
An advantage of the new tool is the opportunity to work with only one building model while conducting a monthly balance based energy assessment or a dynamic hygrothermal whole building simulation. The graphical user interface exchanges a small amount of parameters which are required by the respective setting. Additionally some results of the monthly method may be used automatically as approach for the dynamic simulation.
This paper includes the description of the coupling of both methodologies and an application example, explaining the usage of the tool for a building in cold climates. Furthermore the possible additional and in-depth analysis options and results by the application of the new tool are shown as well as some recommendations for the design process in cold climates.