No. daylight modelling is not directly involved in JV3 modelling. However, compliance with Part F4 (Natural Light) is directly related to compliance with Section J (energy efficiency) on the following grounds:

  • Selection of clear windows for good daylight access may contradict the required reduction in cooling demand in JV3 assessment.
  • Adding a shading screen to a window or a horizontal shading device above the window to reduce the building’s cooling demand, has a negative impact on daylight access,