The European market for residential ventilation is highly driven by energy performance regulations. In new buildings the share of balanced ventilation with heat recovery is increasing as a result of more severe energy performance requirements (NZEB). The energy labeling for residential ventilation units and the ecodesign requirements for ventilation units may be drivers for a more wide-spread application of heat recovery ventilation in new buildings.

The methods used to assess the influence of heat recovery ventilation on the energy use of buildings are typically based on single zone energy balance equations. Multi-zoning is often not considered although heating behaviour and set-points differ in different rooms of a dwelling. As a result of this the energy savings of heat recovery ventilation as assessed with single zone methods may be larger than when the spatial variations in dwellings are taken into account. This is related to the fact that the recovered heat supplied to the dwelling through the ventilation system is not ‘useful’ to reduce space heating and cooling demand at all time and in every room (eg in unheated rooms like bedrooms).

The goal is to collect information to quantify the ‘utilization’ of heat recovery ventilation on the energy use of buildings based on multizone approaches in different climates:

  • Results of multi-zone simulation studies and field studies
  • Definition of influencing parameters 
  • Definition of metrics to define the ‘utilization of heat recovery’ to reduce energy use in dwellings considering the spatial variations in dwellings
  • Ventilation concepts to improve energy performance of heat recovery ventilation