pressure drop calculation combined steel and mesonery duct
DESCRIPTION
Pressure Drop Calculation Combined Steel and Mesonery DuctTRANSCRIPT
Calculation sheet
ProjectProject ConsultantClient xxContractor xxSubject Staircase pressurization fansLocation xxxFan TypeDesign By xx
ItemNo. Identification
HydrolicDia - Dh
(mm)
Length(m)
AirFlowRate(L/S)
DuctVelocity
(m/s)
RenoldsNumber
Absoluteroughness -
ɛ (mm)f'
Darcyfriction
coefficient(f)
TotalPressure
Drop(Pa) Remarks
1.00 Staircase pressurization shaft
1.01 c-d 1550 800 1055.32 5 18632 15.03 1052906 1.3 0.02087 0.02087 13.40Refer eq.21, ASHRAEFundamentals HB 1997
1.02 d-e 1550 800 1055.32 4.9 16562 13.36 932850 1.3 0.02091 0.02091 10.39Refer eq.21, ASHRAEFundamentals HB 1997
1.03 e-f 1550 800 1055.32 4.9 14492 11.69 816255 1.3 0.02095 0.02095 7.97Refer eq.21, ASHRAEFundamentals HB 1997
1.04 f-g 1550 800 1055.32 4.9 12422 10.02 699661 1.3 0.02100 0.02100 5.87Refer eq.21, ASHRAEFundamentals HB 1997
1.05 g-h 1550 800 1055.32 4.9 10352 8.35 583073 1.3 0.02108 0.02108 4.09Refer eq.21, ASHRAEFundamentals HB 1997
1.06 h-i 1550 800 1055.32 4.9 8282 6.68 466478 1.3 0.02119 0.02119 2.63Refer eq.21, ASHRAEFundamentals HB 1997
1.07 i-j 1550 800 1055.32 4.9 6212 5.01 349890 1.3 0.02138 0.02138 1.49Refer eq.21, ASHRAEFundamentals HB 1997
1.08 j-k 1550 800 1055.32 5.95 4142 3.34 233295 1.3 0.02173 0.02173 0.82Refer eq.21, ASHRAEFundamentals HB 1997
1.09 k-l 1550 800 1055.32 4.55 2072 1.67 116707 1.3 0.02270 0.02270 0.16Refer eq.21, ASHRAEFundamentals HB 1997
xxxxx
Duct Size(mm)
Calculation sheet
ItemNo. Identification
Length(m)
No ofFittings
&Accesso
ries
AirFlowRate(L/S)
DuctVelocity
(m/s)
VelocityPressure
(Pa)
LossCoefficientsfor Fittings
EquivalentDia (mm)
PressureDrop
(Pa/m)
TotalPressure
Drop(Pa) Remarks
2.00 Straight Duct Section2.01 a-b 1350 1300 5.84 18632 10.62 67.85 1448.1 0.74 4.342.02 b-c 1350 1300 5.98 18632 10.62 67.85 1448.1 0.74 4.44
Duct Fittings3.00 Bends & Elbows
3.01b-90 degreebend 1350 1300 1 18632 10.62 67.85 0.21 1448.1 - 14.25
Refer Table 14-10-F, SMACNA1990, R/W=1
3.02c-90 degreebend 1000 800 1 18632 23.29 326.54 0.23 976.2 - 73.80
Refer Table 14-10-F, SMACNA1990, R/W=1
4.00 Tees
4.01 d-main 1550 800 1 18632 15.03 135.92 0.01 1201.1 - 1.51Refer Table 14-14-Q SMACNA1990
4.02 e-main 1550 800 1 16562 13.36 107.39 0.01 1201.1 - 1.34Refer Table 14-14-Q SMACNA1990
4.03 f-main 1550 800 1 14492 11.69 82.23 0.01 1201.1 - 1.18Refer Table 14-14-Q SMACNA1990
4.04 g-main 1550 800 1 12422 10.02 60.41 0.02 1201.1 - 1.03Refer Table 14-14-Q SMACNA1990
4.05 h-main 1550 800 1 10352 8.35 41.96 0.02 1201.1 - 0.84Refer Table 14-14-Q SMACNA1990
4.06 i-main 1550 800 1 8282 6.68 26.85 0.03 1201.1 - 0.81Refer Table 14-14-Q SMACNA1990
4.07 j-main 1550 800 1 6212 5.01 15.11 0.05 1201.1 - 0.69Refer Table 14-14-Q SMACNA1990
4.08 k-main 1550 800 1 4142 3.34 6.72 0.09 1201.1 - 0.60Refer Table 14-14-Q SMACNA1990
2062
Duct Size
Calculation sheet
5.00 Transition
5.01
a - Transition(1250x1250-Ø1250) 1250 1 18632 15.18 138.77 0.06 1250.0 - 7.82
Refer Table 14-12-A SMACNA1990
5.02
a - Transition(Ø1250-1350x1300) 1250 1 18632 15.18 138.77 0.21 1250.0 - 29.56
Refer Table 14-11-B SMACNA1990
5.03
c - Transition(1350x1300-1000x800) 1000 800 1 18632 23.29 326.54 0.06 976.2 - 19.90
Refer Table 14-12-A SMACNA1990
5.04
c - Transition(1000x800 -1550x800) 1000 800 1 18632 23.29 326.54 0.23 976.2 - 74.86
Refer Table 14-11-B SMACNA1990
6.00 VCD/ damper
6.01 l-Airfoil blade 800 500 1 2072 5.18 16.15 0.52 686.7 - 8.40Refer Table 14-18-E SMACNA1990
6.02 a-Airfoil blade 1250 1250 1 18632 11.92 85.60 0.52 1366.5 - 44.51Refer Table 14-18-E SMACNA1990
External Static Pressure of Staircase pressurization fan(Pa) 336.72Add 20% safety factor 67.34Total External Static Pressure of Staircase pressurization fan (External static pressure+20%SF+50) (Pa) 455.00
Notes - Vertical duct section (from "c" to "l") - concreate construction - Duct section in the roof - Sheet metal (GI) - Absolute roughness (ɛ) of concrete 1.3 mm ( pg. 32.7, ASHRAE Fundamentals HB 1997 ) - The size of virtical duct section (shaft) should be equal to the slab opening size (1550x800 mm) and finished using side walls. 9 numbers of wall openings (600x900 mm ) should be provided for the air terminals. - Total External Static Pressure of Staircase pressurization fan = External static pressure + 20%SF + 50 (pa)