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 . is in-tended to be warmed, the diameter should not be less than 2j^inches; when the coil is a direct radiator, not in contact withcold air, die diameter should not be less than 11^ inch. FLOW OF HOT WATER IN PIPES. The circulation of water in pipes of a hot water apparatus iscaused by the difference in weight of two columns of water,connected at 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 . is in-tended to be warmed, the diameter should not be less than 2j^inches; when the coil is a direct radiator, not in contact withcold air, die diameter should not be less than 11^ inch. FLOW OF HOT WATER IN PIPES. The circulation of water in pipes of a hot water apparatus iscaused by the difference in weight of two columns of water,connected at top and bottom, see Fig. 23; one column being HEATING. 49 continually heated, and the water expanded, thereby produc-ing a difference in weight, and in consequence a circulation. The velocity increases with the temperature in the risingcolumn, and the loss of temperature in the return column; it isreduced by the friction in the pipes and elbows. The friction in pipes decreases with the velocity, and, in a lessdegree, with the increase in diameter of the jiipes; it also de-creases with the temperature of the water, up to certain limits;this, however, is not considered in the following: Let Fig. 23 represent a boiler with main circulating Reference :—(All dimensions in ft. and lbs.) See Fig. 23. Let H = Effective head of water, producing motion. Hi = Height of water above lowest point of return pipe. t =Temp. of water in boiler = 210°. t, = Temp, of water as it returns to boiler. . t+t, t^ = Average temp, of water m pipes = —^ ? T = Temp, of air in contact with pipes,w = Weight of water at the temp. = Weight of water at the temp. t,.Q = Quantity of water to be moved, per 50 HEATINP AND VENTILATION. q = Contents of one lineal foot of pipe,u, = Units of heat given out by the pipe per lineal foot,per = Ixngth of = Sectional area of pipe,d = Diameter of pipe,f = Friction in straight run of pipe,f, = Friction in elbows. V = Velocity of water in
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectventila, bookyear1901
