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 . he temperature of i lb. of water i° , to heat 50 lbs. of water 1° would require =50 x i= 50 units, or if it were required to heat 50 lbs. 20° it would be50X 20X I = 1,000 units. Specific heat:âIs the capacity of a body for heat; it is thenumber of units of heat necessary to raise the temperature ofthe body, 1° Fahrenheit. See ta
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 . he temperature of i lb. of water i° , to heat 50 lbs. of water 1° would require =50 x i= 50 units, or if it were required to heat 50 lbs. 20° it would be50X 20X I = 1,000 units. Specific heat:âIs the capacity of a body for heat; it is thenumber of units of heat necessary to raise the temperature ofthe body, 1° Fahrenheit. See table. Transmission of heat:â I St. By radiation; that is, the heated body giving out its heatin rays. 2d. By convection, the heat being conveyed from the heatedbody through flues. 3d. By conduction, the heat passing from a heated body to acolder one, when in contact. Loss of heat, or cooling of bodies,-^Bo^ts are cooled :I St. By radiation. 2d. By contact, (with cold air. or a, colder body).3d. By conduction. 32 Let T and T,t, tâ t, and t. HEATING AND VENTILATION. Temp, of air in room, see Fig. 17. Temp, of surfaces of , be the heated , = Loss of heat by = Loss of heat by = Loss of heat by H will lose: ist. By radiation (L,), when T = T, = t^ = t3 > t = t,;2d. By contact (L,), when t = t, = t, = t, > T = T.;3d. By conduction (L3), when T, =t. = tj > T = t = tj4th. By radiation, contact and conduction (L.+L^+Lj),when t3 > T = T. = t, = t = t,. Loss of heat by radiation:âRadiation is not affected by theform of the body, nor by the distance of the absorbing body;i possesses the property of passing through moderate thick-ness of air or gases without heating them or losing any of itsheat, to any appreciable extent. Air and gases can, underordinary circumstances, be heated by contact only. Reference :â L, = Units of heat absorbed or emitted per square ft. per hour,by = Factor for loss of heat
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