Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . nown. If this amount is M, ^ is the CONDENSERS, COOLING TOWERS AND EVAPORATORS 353 amount of steam condensed in the first stage, ~o M is condensed in the second stage, ^9 M is used on the third and ^9 M is condensed in the con-denser. By using the methods of this chapter or Chapter III, the surfacerequired for this heat under the conditions given can be determined. The loss of heat from the surface of the evaporators can becomputed by the methods of Chapter III, when the actual sizeand sha
Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . nown. If this amount is M, ^ is the CONDENSERS, COOLING TOWERS AND EVAPORATORS 353 amount of steam condensed in the first stage, ~o M is condensed in the second stage, ^9 M is used on the third and ^9 M is condensed in the con-denser. By using the methods of this chapter or Chapter III, the surfacerequired for this heat under the conditions given can be determined. The loss of heat from the surface of the evaporators can becomputed by the methods of Chapter III, when the actual sizeand shape is known with the temperatures. This would givea definite number of heat units instead of the percentage. Itsuse would be the same as above. At times the supply for each evaporator is taken from theweak liquor line and then the terms O2 + e3) q2esqf3 will be omitted from the equation. Each stage will have theweight evaporated in that stage as the unknown in the feed might be heated by the outgoing condensate or if notan assumption of its temperature would be made. lbs. Condenser. Fig. 169.—Hodges multiple still. To remove the air which may collect in the various condensingchambers, air pumps must be attached or small vent holesmust be made from the condensing chamber to the boilingchamber. Another multiple effect known as Hodges Multiple Still isshown in Fig. 169. In this A is the boiler and B, C, D, E, F, Gand H are evaporators or stills. Steam from the boiler ispassed into still B to evaporate its amount M of the liquidand enough steam is added to the steam exhausted from onestill from the boiler steam to give sufficient heat to condensethe same quantity M in the next still and to make upfor the radiation and the steam lost by the blow-off fromthe valves K. The blow-off is intended to remove the air from 23 354 HEAT ENGINEERING the evaporator. / is a condenser and J is a feed-water heaterto reduce the temperature of the condensate. The feed to eachstil
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1915
