HYSYS® Hysys: the Aeraulic solution® sizingaidfoRtheaiRduCtnetwoRK Exhaust air Return air Supply air Fresh air FLOWAY Equivalent length of the SUPPLY pipe available for the primary network (lin- ear metres) (based on the capacity of the loop) Installation power (kW) Diameter 20 25 30 35 40 50 60 70 80 90 100120140160180 200 DN 50 100 71 50 35 27 DN 65 185143111 71 50 37 31 DN 80 83 66 52 41 29 DN 100 200156113 76 60 48 39 DN 125 217178135 111 Room to be treated: Office R1 pack, opening Fresh air of fresh air intake on outlets based Presence CU on presence detector, room by room Meeting Room R+ pack, fresh air control based on the read CO2 CO2 level Equivalent length of the SUPPLY pipe available for the secondary network (linear metres) (based on the capacity for the zone in question) Zone power (kW) Diameter 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 35 DN 25 85 DN 32 193 146 96 71 59 44 38 DN 40 207 150 122 96 79 67 56 48 42 DN 50 250 207 187 158 140 120 108 97 91 RuLesfoRdeteRminingaiRfLowRates There are various ways of defining the ventilation flow rate required in a building. 3 methods are generally used to calculate the required air flow rates: ■ Based on a certain volume of air to treat; generally 1 vol/h, that is to say the air change of the whole volume of the building in one hour (this is calculated by multiplying the surfaces by the average ceiling height). ■ Based on average occupancy (number of people per room), use and type of room. InFrance 25 m/h/per person is generally3 accepted for the majority of buildings. ■ I n compliance with European standard EN 15251, which sets the required fresh air flow rates depending on how the building is used, its surface area, the number of occupants, pollutant emissions, etc. This is the most exhaustive standard, and takes into account all of these criteria, which generally imposes higher flow rates. * The recommendations and indicated length values are for information only, and in no way engage CIAT's liability 130 130 CATALOGUE 2021