Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . ^ draft, etc., then theresult must be based upon thenumber of pounds of water evap-orated per pound of coal. This latter phrase includesnot only the purely combustible matter in the coal,but the non-combustible also, as ash, moisture, varieties of western coal contain as high as 12 to14 per cent, of moisture, and the ability of the furnace. FIGURE 12. 126 ENGINEERING to extract heat from the mass is to be tested, as wellas the ability of the boiler to absorb and transmit thatheat to the w
Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . ^ draft, etc., then theresult must be based upon thenumber of pounds of water evap-orated per pound of coal. This latter phrase includesnot only the purely combustible matter in the coal,but the non-combustible also, as ash, moisture, varieties of western coal contain as high as 12 to14 per cent, of moisture, and the ability of the furnace. FIGURE 12. 126 ENGINEERING to extract heat from the mass is to be tested, as wellas the ability of the boiler to absorb and transmit thatheat to the water. Therefore the efficiency of theboiler and furnace = Heat absorbed per pound of value of one pound of coal. If the test is to determine the efficiency of the boileritself as an absorber of heat, then the combustiblealone must be considered in working out the finalresult. Thus, Efficiency of boiler = Heat absorbed per pound of value of one pound of combustible. When making a series of tests for the purpose ofcomparing the economical value of different varietiesof coal the conditions should be as nearl}^ uniform aspossible; that is, let the tests be made under ordinaryworking conditions and with the same boiler or boil-ers, and if possible with the same fireman. The following is a record of one of many evapora-tion tests made by the author, and is introduced herefor the purpose of illustrating methods
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