Mandik FDMR, Техническая документация инструкция

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Page 29 Version 2022-12-20 FDMR - Fire damper
TPM 165/22
II. TECHNICAL DATA
Pressure loss
Pressure loss calculation
Determination of pressure loss by using diagram ρ = 1,2 kg/m 3
Δp = ξ · ρ ·
w 2
2
Δp [Pa] presure loss
w [m/s] air flow speed in nominal damper section
ρ [kg/m 3 ] air density
ξ [-] coefficient of local pressure loss for the nominal damper section
D 100 125 140 150 160 180 200 225 250 280 300
ξ 2,736 2,099 1,781 1,527 1,272 0,929 0,636 0,892 0,747 0,627 0,576
D 315 350 355 400 450 500 560 600 630 710 800
ξ 0,531 0,471 0,455 0,393 0,344 0,307 0,273 0,258 0,243 0,111 0,099
Coefficient of local pressure loss