7/27/2019 Fans Static Head Calculation Sheet
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PROJECT: SITE : RIYADH Date : 5/5/2009
UNIT.NO. : EF-05 BUILDING : 1st, 2nd & 3rd FLR Revision :
0
GENERAL DATA
DUCT MATERIAL : G. I. Sheet
ROUGHNESS COEF. : 0.93
ALTITUDE : 611 Meters
ALTITUDE COEF. : 0.935
AIR DENSITY : 1.09 Kg/m3
DUCTS PRESSURE LOSSES BOARD
SECTION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 TOTAL
FLOW CFM 980 980 980.0 490 490 390 200
FLOW M3/H 1666 1666 1666 833 833 663 340
LENGTH M 1.00 1.50 4.15 4.15 7.10 3.40 4.10 25.4 m
DIAM. mm 382.61 382.61 382.61 299.07 299.07 244.06 218.63
DIAM. EQUIV. 382.61 382.61 382.61 299.07 299.07 244.06
218.63
WIDTH mm 350 350 350 250 250 250 200
HEIGHT mm 350 350 350 300 300 200 200
AREA M2 0.11 0.11 0.11 0.07 0.07 0.05 0.04
VELOCITY M/S 4.03 4.03 4.03 3.29 3.29 3.94 2.52
PD per Meter Pa 0.53 0.53 0.53 0.50 0.50 0.89 0.45
PD x LENGTHPa 0.53 0.80 2.22 2.08 3.56 3.02 1.84 14.06 P
Co 1 2 3 4 5 6 7 8 9 10 11 12 13 14 TOTAL
ELBOW 30 0.07
ELBOW 45 0.09
ELBOW 90 0.15 1 2 1 1
TEE 45 0.3
TEE 90 1
END TEE 1.5
BRANCH TEE 0.05 1 1 1
TRANSITION 0.22
CONTRACTION 0.05
WIRE MESH 0.04
TOTAL Co 0.15 0.05 0.05 0.05 0.30 0.15 0.15 0.90
DUCTS PD Pa 1.32 0.44 0.44 0.30 1.77 1.27 0.52 6.06 P
PRESSURE DROP Pa 1.86 1.24 2.66 2.38 5.33 4.29 2.36 20.12 P
SPECIAL FITTING PRESSURE DROPS0.70 W
DESIGNATION PD (PA) QTY TOTAL STATIC PRESSURE AT 100% 175 Pa
FIRE DAMPER 10 1 10 FLOW AT 100% 1666 m
VOLUME DAMPER 10 1 10 * DUCTS PRESSURE DROP : 20 Pa
SUPPLY GRILLE 15 * FITTING PRESSURE DROP : 155 Pa
RETURN GRILLE 10
FRESH AIR LOUVER 20
VAV BOX 100
ALUMINUM FILTER 80
BAG FILTER 150PLENUM BOX 50 1 50
DUCT HEATER 5
DISC EXHAUST VALVE 70 1 70
FLEXIBLE DUCT CONNECTION 15 1 15
SOUND ATTENUATOR 75
TOTAL 155 Pa
