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 . = = = 150 = 100 = S X S = 25 sq. ft. VENTILATION. 25a /(70— 30) 20 + (l( V^ \/ 100 I + (100 — 30) 80 + h 2 ./ 800+ 5600 _ „ 66 /6 T I+3-5+o-s y 6400 5^ X 35-7 = feet per second. Example:—What is the velocity in shaft as per Fig. gi?Dimensions, etc., same as above, except that t
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 . = = = 150 = 100 = S X S = 25 sq. ft. VENTILATION. 25a /(70— 30) 20 + (l( V^ \/ 100 I + (100 — 30) 80 + h 2 ./ 800+ 5600 _ „ 66 /6 T I+3-5+o-s y 6400 5^ X 35-7 = feet per second. Example:—What is the velocity in shaft as per Fig. gi?Dimensions, etc., same as above, except that tj = t = 30°,and h = h^ ^ 80 ft. Hence:— V = 4/(i°°EM8^= ^.366 /i6^o K 1 + 3-5 + V 5 = X 33-5 = feet per second. Should thefire or heater be at the bottom, h = 100 ft., v becomes ./(t°°-3°) i°°= i/7°°°T I + 3-5 + o-S T 5 = X = ft. per second. Example: —In shaft as per Fig. 9k, having the followingdimensions:— h,^ 80; h, ^ 20, and t ^ 30; tj= 70; t.,= 100°assuming a frictional resistance of 5, V = i/(l 00 — 30) 80 4- (100 — 70) 20 S600 = X = ft. per second. 26 HEATING AND VENTILATION. FANS. VOR VACUUM OR PLENUM MOVEMENT, ACCORDINGTO Reference:—See Fig. 15. V = Volume of air delivered in cubic ft. per second. h = Height manometer, in duct, in feet; generally to = Velocity of the air entering the = Velocity of the air leaving the = Outer radius of vanes,r, = Inner radius of vanes,r^ = Radius of = Radius for the curve of vanes,b = Width of vanes,a = Height 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° =
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectventila, bookyear1901
