. Journal of electricity, power, and gas . ssarv to generate one To superheatthe exhaust from the engine too degrees would thenrequire = 750 , isaverasre specific heat of superheated steam at this pres-sure. To re-evaporate to per cent, or lb., at would require (qfif, -\- too X ) = Then the active flue gas temperature would be +T lowered = per cent. This would still 5S80 leave a temperature difference between flue gases and 450 X . air of 450 ; = 276 degrees for an TOO 582 JOURNAL OF ELECTRI
. Journal of electricity, power, and gas . ssarv to generate one To superheatthe exhaust from the engine too degrees would thenrequire = 750 , isaverasre specific heat of superheated steam at this pres-sure. To re-evaporate to per cent, or lb., at would require (qfif, -\- too X ) = Then the active flue gas temperature would be +T lowered = per cent. This would still 5S80 leave a temperature difference between flue gases and 450 X . air of 450 ; = 276 degrees for an TOO 582 JOURNAL OF ELECTRICITY, POWER AND GAS to utilize, or for creating draft in the I Vol. XXIV—No. 26 economizerchimney. The entropy diagram, Fig. 2, shows what workthere is available in the stream. It is calculated asfollows: The entropy of water at 100 degrees (561 degrees T 561 absolute) log — = log — = 493 The entropy of water at its final temperature 397 (397 + 461) degrees (225 lb. gauge) log = 493 Si^perheof Z3 t^OCUU/n. r Si/pcrhea/er -Secona Sufierheot riG. z. The entropy of dry saturated steam at 225gauge: T r 833 = log h — = -\ = lb. 493 858 r = latent heat of vaporization = 833 X T = 397+ 461 ^ 858 degrees. The additional entropy of superheated steam 200degrees superheat starting at 397 degrees. Ts (858 + 200) <^s. = X c log. — = X log T 858 = c taken = 0,65 = specific heat of superheatedsteam starting at 397 degrees. The total entropy of stiperheated steam 200 de-grees superheat starting at 397 degrees. 4, + S^= + = Re-evaporation 10 per cent. Total entropy of steam after re-evaporation = 10 H X 1-654 = i-8i9- 100 The additional entropy of superheated steam 100degrees superheat starting at 212 degrees. Ts= <^s= = X log log 773673 Ts= = 673 + too = 773. T= =212-1-461=673. c taken = ^ specific heat of superheatedsteam starting at 212 degrees. Total entropy o
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