Steam power plants, their design and construction . n chimney formulas are those of Kent, Galeand Christie. In the former H,P. = which H is the height in feet and E is the effective area, theactual area being determined by increasing the diameter of thechimney if it be round or the side of the chimney if it be squareby 4 inches to allow for the lining of the chimney by a layer ofgas that is assumed to have no velocity. E is approximately equalto (A — V A) for round chimneys and to A—V3 V A forsquare chimneys. As this formula is based upon the burning of5 pounds of coal per horse
Steam power plants, their design and construction . n chimney formulas are those of Kent, Galeand Christie. In the former H,P. = which H is the height in feet and E is the effective area, theactual area being determined by increasing the diameter of thechimney if it be round or the side of the chimney if it be squareby 4 inches to allow for the lining of the chimney by a layer ofgas that is assumed to have no velocity. E is approximately equalto (A — V A) for round chimneys and to A—V3 V A forsquare chimneys. As this formula is based upon the burning of5 pounds of coal per horse power C= E /H where C equals the number of pounds of coal burned per Kent formula assumes that the height and area are interde-pendent, and it only holds within certain formula may be expressed in the form A = ^^andH=£!e/C.\2 in which t is the temperature of the chimney gases and G the gratearea in square feet. Col. E. D. Meier, who has a great deal of ex- STEAM POWER PLANTS. ^€ |...^,|„...i^i33i £Ll?iL. El. SOT- Section at Elev436 Section at Elev I50* Figure 52.—Chimney Metropolitan Street Railway Co., New York. 134 STEAM POWER PLANTS. perience with western coals, states that this formula gives rathertoo large results and recommends that and that after the height is found by this formula the area be ob-tained by the one proposed by Mr. Kent. Mr. George A. Orrok in a recent issue of Power states thatthe constant in the general chimney formula, for which Kentgives the value of , varies greatly in the formulas of differ-ent authorities, and Mr. Orrok recommends that a value of 12be given it for brick-lined stacks, but that in case of an unlinedsteel stack the value of this constant may be increased to 14 or 15and for small stacks 16 may be used. Mr. W. W. Christie in his book on Chimney Design givesthe chimney formula: Horse power = A i/ H, it being as-sumed that four pounds of coal are burned per horse power, Abeing the ar
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