Handbook of Heating, Ventilating and Air Conditioning by F. Porges (Auth.)

By F. Porges (Auth.)

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By F. Porges (Auth.)

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Typical arrangements iter FRESH AIR INLET r F AN LOW LEVEL DISCHARGE GRILLE . M ^LOW LEVEL [Γ μ DISCHARGE GRILLE FAN FRESH AIR INLET BOILER 1 SINGLE ENTRY FAN I FRESH AIR INLET BOILER 2 DOUBLE ENTRY FAN, TWO AIR INLETS -LOW LEVEL DISCHARGE GRILL FRESH AIR INLET FAN BOILER 3 DOUBLE ENTRY FAN, SINGLE AIR INLET 3 To reduce C 0 2 concentration to 1%, fan must handle 100m mixed volume 3 per l m natural gas fuel burnt. In determining fan pressure allowance must be made for pressure due to local wind conditions.

7X10 4 4 11X1044 4 di 4 4 4 4 di di 20X10 4 4 di 110X1044 di 220X10 4 4 di ii =1*2=head loss in feet of oil per foot of pipe or metres of oil per metre of pipe. (Length of pipe to include allowances for bends, valves and fittings) fi=üov/ of oil in gal/hr / 2 = f l o w of oil in litre/s d\= internal diameter of pipe in inches d2=internal diameter of pipe in mm. The above formulae are for laminar flow. Flow is laminar if Reynolds Number (Re) is less than 1500. Reynolds number can be checked from the following formulae.

Of Dia. of Pipe Outside Flange Bolt π · ι Size Dia. of Circle Wrought Pipe in in in 1 7 2 ι 4 Η It 21 3 2 ITV 1« 4 4i 4} 5* 2 2| 6 Ά 3 3y 4 5 3 6* 4 4j 5t 5 Number of Λ ι Bolts Diam. (stamped or forged) Iron £>teel screwed or riveted on with boss or welded on with fillet in 2| 2i 3| 3-Λ 3* 4y 6(a) 6(b) 6(c) 4 4 4 4 4 4 4 in in 1 1 Τ 1 Τ 1 Τ 2 2 i 1 6* 4 4 4 8T 10 7 8} 4 8 1 7+ 8 5 5} 8 1 8 ί 8 i i 6 7 8 6t 7{ 8| 11 12 13} 9} 10} Hi 8 8 8 9 10 91 10} 14| 16 12} 14 8 8 12 *13 14 18 19} 20} 16 17} 18* 12 12 12 i4 15 16 *17 121 14 15 16 17 18 2H 22} 24 19* 20* 21} 12 12 12 18 *19 20 19 20 21 25} 26j 27} 23 24 25} 12 12 16 21 *22 *23 24 22 23 24 25 29 30 31 32± 26j 27j 28| 29} 16 16 16 16 t Τ 1 Τ 1 Τ 1 4 2 8 2 8 2 8 1 2 8 1 i I_L 1 6 2 11_L6 2 2 _2_ 1 6 _2_ in 1 6 _1_ 1 6 J_ 1 6 1 4 1 4 1 6 1 6 1 6 _i_ S1 6 i 1 6 4 2 12.

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