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While the Passivhaus design approach and certification depend on the Passivhaus Planning Package (PHPP) steady-state building simulations, including the natural ventilation assessment, design, and planning, this paper aims to assess the effectiveness and behaviour of the Passivhaus ventilation plan taken from the Passivhaus Planning Package (PHPP) natural ventilation tab through the implementation of Computational Fluid Dynamics (CFD), building modelling and simulation. The study approach provides useful and informative assessment for building designers to manipulate natural ventilation plans in a more efficient way, leading to a more accurate decision making and increased flexibility in the design process. The results, through a case study, have unveiled the fact that airflow patterns are of an uncomfortable airspeeds at certain locations, surpassing 2 and 3 m/s at specific inlet air velocities, causing turbulence at some points of coverage, where these outputs could be implemented in adjusting the architectural design decisions regarding airflow direction.

Keywords: Passivhaus; PHPP; Natural Ventilation; CFD; Building Simulations.

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