Mandik FDMR - Technical Data; Pressure Loss

Page 29Version 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