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1 – Compactness is the relationship between a building’s usable space and 8 – Generation calculation using the PEB software - Annex II of the Walloon
its thermal loss surfaces. The higher a building’s compactness, the greater Government Decree of 17 April 2008.
is its usable space vis-à-vis thermal loss surfaces. 9 – Calculation based on the minimum heat production specified by the
2 – Thermal bridge calculations were done using the Therm© software. manufacturer Sonnenkraft – SK500©.
3 – PUR: polyurethane is a polymer composed of organic units joined 10 – An indicator measuring consumption levels (heating, cooling, auxiliary,
by urethane links. lighting), minus the in-house production of renewables (cogeneration,
4 – Via the software package Autodesk Ecotect Analysis©. photovoltaic) expressed in primary energy units with respect to a reference
5 – Calculated using the BRE (Building Research Establishment) method. value. Ew80 means Ew_bldg/Ew_ref = 80 %.
The daylight factor is the ratio between the light level inside a structure 11 – An indicator of the building’s overall level of insulation - See Annex VII
and that outside the structure under a standardised overcast sky. The opti- of the Walloon Government Decree of 17 April 2008.
mal daylight factor for a gym is 2 - 5%. 12 – Levels calculated on the basis of the planned performance levels
6 – Thermal transmittance value (Uw or Ud) expressed in W/m²K. (initial energy performance declaration).
7 – The solar gain factor or solar heat gain factor g represents the amount 13 – BEPU = Building energy performance unit
of solar energy transmitted into a building, expressed as a percentage.