. The street railway review . um of 28in., or a pressure of i lb. per sq, in. absolute, has a temperature inround numbers of 100° K. and a volume of aliout .350 cu. ft. per latent heat per pound is about 1,044 R- ■ •• ■ •<» assuminga small drop in the temperature of the air pump discharge belowthat of the steam itself, it may be rightly assumed that 1,050 B. t. taken out of every pound of steam. The general practice is to assume thai the circulating water hasan initial temperature of 70° R If for good results it be furtherassumed that the circulating water will leave Ihe conden
. The street railway review . um of 28in., or a pressure of i lb. per sq, in. absolute, has a temperature inround numbers of 100° K. and a volume of aliout .350 cu. ft. per latent heat per pound is about 1,044 R- ■ •• ■ •<» assuminga small drop in the temperature of the air pump discharge belowthat of the steam itself, it may be rightly assumed that 1,050 B. t. taken out of every pound of steam. The general practice is to assume thai the circulating water hasan initial temperature of 70° R If for good results it be furtherassumed that the circulating water will leave Ihe condenser at 85°F., or 15° below the 100° theoretical temperature of the steam, thenthere is a rise in the temperature of the circulating water of 15*..Since there are 1,050 B. t. u. in a pound of steam to be condensedthe ratio of circulating water to condensed steam is as 1,050 to 15or as 70 to I. The capacity usually provided is for an amount littlein excess of this ratio. There are cases in southern waters of the. FIG, I.—WHEELER SURFACE CONDEKSER, WITH ED\V.\RDS AIR PUMT FOR I,000-K\V. WESTINGHOUSE-PARSONS a vaciuini of between 25 in. and 26 in. was not only all that wasnecessary for reciprocating engines, but all that was manufacturers of condensing apparatus attempted to meet thedemand by using the same class of condensers, and of air andcirculating pumps that they had been supplying for engine practice,making them just a little larger so as to be liberal, hut did not atall realize either the size or the character of the machinery that isreally necessary to produce the results desired. There were somemanufacturers of high grade air pumps who had been making themof the crank and fly wheel type and using them to obtain vacuumsof 27 in. to 28 in. in sugar house work, but there is not recalled asingle instance in the early condenser practice for turbines wheresuch pumps were used. Pumps of this type are expensive andhaving never
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
