A manual of heating and ventilation, in their practical application, for the use of engineers and architectsEmbracing a series of tables and formulas for dimensions of heating flow and return pipes, for steam and hot water boilers, flues, etc., etc . ht of outlet,a, = Distance from vertical radius to point e,. VENTILATION. 27 n := Number of revolutions per ° = Angle between radius and initial line of = Horse power required. When there is only one inlet, When there are two inlets, Ta ^ -A > ?» ^^ v » V c;r * 2c;r J. 3 r ° 2/Tr,C r, = r, to 2r,; ^^V-^ r—r . nr 1 = T-^—, in whi
A manual of heating and ventilation, in their practical application, for the use of engineers and architectsEmbracing a series of tables and formulas for dimensions of heating flow and return pipes, for steam and hot water boilers, flues, etc., etc . ht of outlet,a, = Distance from vertical radius to point e,. VENTILATION. 27 n := Number of revolutions per ° = Angle between radius and initial line of = Horse power required. When there is only one inlet, When there are two inlets, Ta ^ -A > ?» ^^ v » V c;r * 2c;r J. 3 r ° 2/Tr,C r, = r, to 2r,; ^^V-^ r—r . nr 1 = T-^—, in which the tangent z° = —^ describes 2r, sm. z° c a curve from the point e, to the inner periphery of vanes. a = — I in which c, = _/ < - c | + nr; a, = a; The^ of effect is generally from 30 to 60, therefore for 40^ Hp = ^l^Vh = ° 4° The shell of this fan has the form of an archimedean spiral,beginning at point e. The number of vanes = lorj, generally 4 to = 10 to 40 ft. per second. Example :—How many horse power are required to deliver260 cubic ft. of air per second, when h = ? Hp = = 28 HEATING AND VENTILATION. FANS. FOR VACUUM OR PLENUM MOVEMENT, ACCORDINGTO Reference:—See Fig. i6. A = Sectional area of air current, as it leaves the = Sectional area of air current, as it enters the = Sectional area of delivery Volume of air delivered in cubic ft. per second, theoretical , = Volume of air delivered in cubic ft. per second,actual quantity passing through the = Width of fan, outside. b, = Width of fan, inside. c = Velocity of air entering the fan, theoretical. c, s= Velocity of air leaving the fan, theoreticaL VENTILATION. 29 c, = Velocity of air leaving the fan, actual, from 6 to 20 = Outer diameter of fan. d. = Inner, diameter of fan. _ Column of air 28133Column of water ~ 33-95 ~g = Force of gravity = = Height of manometer, from ^
Size: 1703px × 1466px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectventila, bookyear1901
