Pressure Drop Calculations in Hydronic SystemsFull description
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Calculation for Duct Static Pressure Loss FCU Fresh Air Supply Fan
2844 28 44 CM CMH H
Supply Fan Flow Rate:
Fitting Number
Duct Element
Material
(CMH) 1
RA Grille
2
DUCT
3 4 5 6
7 8
9
DUCT FCU DUCT Flexible Duct DUCT SA Grille
Rectangular
Round
Equivelant Dia.
Velocity
Velocity Pressure
(mm)
(m/s)
(Pa)
Duct Length
Loss Coefficients
(m)
(Co)
2844
1250
150
420
5.7
19.6
Plenum(1300x250x250)
Galvernised Iron
2844
1300
250
578
3.0
5.5
200
200
219
7.0
29.5
3.5
Plenum(850x300x350)
Galvernised Iron
2844
850
300
535
3.5
7.4
0.4
3128
200
150
189
31.0
578.0
Plenum(850x300x350)
Galvernised Iron
3128
850
300
535
3.9
9.0
0.4
200
200
219
7. 7.7
35.6
3.5
3128
1300
250
578
3.3
6.6
0.3
3128
1250
150
420
6.3
23.7
Flexible Duct
Duct size (mm)
Airflow Rate
948
1043
Plenum(1300x250x250)
Galvernised Iron
200
200
Total Pressure Loss Safty (10 %)
ASHRAE Fitting Number
*f 0.3
0.41
*f
0.41
*f *f
Hudraulic Diameter
Absolute Roughness
Renold Number
Friction Factor
Dh
(mm)
Re
f
Duct Pressure Loss (Pa/m)
419 0 443 0
0.09 0.00 0.09 0.00
83893 0 103536 0
0.020 0.000 0.019 0.000
0.26 0.00 0.32 0.00
0.1 12.1 0.1 0.0
443 0 419 0
0.09 0.00 0.09 0.00
113875 0 92255 0
0.019 0. 0 .000 0.020 0.000
0.39 0.00 0.32 0.00
0.1 14.6 0.1 5. 5 .0
0 0
0.00 0.00
0 0
0.000 0.000
0.00 0.00
34.1 37.5 38.0
0
0
ASHRAE Hand Book, Fundamentals 2001 Based Base d on Ma Manu nufa fact ctur urer er Da Data ta Required External Static Pressure for PAU Fresh Air Supply Fan with 10% safety
1
Design Mfg Actual
Supply Air Flow Rate Required Cooling Capacity Specific heat capasity Temp difference
= = = = = =
12553.65 1000 12
Supply flow rate from 1 flexible
= = =
0.87 868.88 289.63
Fresh Air flow rate
=
78.75
l/s
Return Flow Rate Return Flow Rate form 1 flexible
= =
790.13 263.38
l/s l/s
= = = =
0.5 12.5 0.41 2.87
Mass flow rate Air density(20C) Supply Air flo rate
2
( Pa ) 2. 0
Require Static Pressure For Fan
*a *f
Total Pressure Loss
Flexible Duct Pr Pressure drop 200 mm flexible duct pressure drop
