86 



Indiana University Studies 



The above figures are based upon 26 pounds of air per pound 

 of coal burned, tlie air being taken in at a temperature of 70 

 degrees Fahrenheit. It has been calculated that for each increase 

 of 10 degrees in the temperature of the feed water a saving of 1 

 per cent in fuel can be realized, with a decrease of 20 degrees 

 in the temperature of the escaping flue gases. This saving can 

 be effected by the use of economizers. In the modern types of 









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Plot 4 gives the approximate fuel consumption of tlie different types of power- 

 producing equipment. 



economizers, a series of cast-iron tubes thru which the hot gases 

 must pass is inserted in the flue between the boiler and the stack. 

 The feed water is led thru these tubes under a pressure that allows 

 it to be heated well above the boiling point, and it is then fed to 

 the boiler at temperatures higher than could be realized with 

 feed-water heaters. The main criticism against economizers 

 is the fact that they interfere with the draft, but with the installa- 



