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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