Smoke ventilation according to EN 12101-2 - D+H Mechatronic

opening angle must be applied. (The Cv0 values can easily become worse as the width-height ratio increases andat low opening angles from the influence of jambs and latches.)In general: the lower the width-height ratio, the better the Cv0 value. The tables used to determine the openingangle per series are provided in the “Technical Information” section of the D+H Euro-SHEV system module.2.3.5. Determining the aerodynamic free opening area for an NSHEVThe aerodynamic free opening area for a window/NSHEV is calculated by multiplying the geometric opening areaA vcalculated in 2.3.1. with the coefficient of discharge Cv0 from 2.3.3.:A a= A v× Cv0A a= 1.76 m² × 0.40A a= 0.70 m²/NSHEV2.3.6. Determining the number of windows required for this smoke sectionIn this sample calculation, it is assumed the windows are the same. If windows are different, this calculation mustbe repeated per window. The sum of the aerodynamic free opening area of the individual windows then providesthe value for the total smoke extraction area.A a target total: A a= number of windows required for this smoke section3.50 m²: 0.70 m² = 52.4. ResultFive windows are required to achieve the aerodynamic total smoke extraction cross section for this smoke sectionat a stroke of 1,000 mm and a vent size of 1,200 × 1,600 mm.38Section B