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 . The higher the ascending and descending pipes, or thegreater the difference between their temperature, the more rapidwill be the circulation. To increase the difference of temperature between the as-cending and descending pipes, either increase the quantity ofpipe, so that the water will flow a greater distance, or decreasethe diameter, so that th
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 . The higher the ascending and descending pipes, or thegreater the difference between their temperature, the more rapidwill be the circulation. To increase the difference of temperature between the as-cending and descending pipes, either increase the quantity ofpipe, so that the water will flow a greater distance, or decreasethe diameter, so that they will part with more heat. Thespecific gravity in pipe li (Fig. 21), must be greater than in pipeh„ to produce circulation; the greater amount of cooling should 46 HEATING AND VENTILATION. Flow pipe. take place in the coils above the dotted line aj or bottom ofboiler. (See Fig. 21.) The hot water should rise to the highest point in the mostdirect way, so that the pipes give outthe heat in returning to the boiler;otherwise a reversal of the circula-tion might occur. All closed boilers must be pro-vided with a supply cistern, locatedabove the highest point of the ap-paratus; it should be proportionedto contain about -^ of the wholequantity of water in the pipes andboiler. The pressure in the boiler and pipes increases only withthe height of cistern above the boiler or lowest pipe. The pipe from cistern should lead to the bottom of boiler, orinto the return pipe, and bent in the shape of a syphon, seeFig. 20, to prevent the escape of heat or vapor from theboiler. The effect is the same, whether there are more flow thanreturn-pipes, or vice versa ; each range will act separately, hav-ing a velocity of circulation peculiar to itself; they may returnto the boiler separ
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectventila, bookyear1901
