This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1918 Excerpt: ...for such plants. Something may be gained by such a
plan, but the probable saving would be small compared to the amount
which would be saved by substituting central-station power. Fig. 1
shows the approximate coal consumption for Coal Consumption (1915)
of Small Central Stations; Data from Tenth Annual Report Public
Service Commission, State of New York small central stations. The
large modern central station can produce power on 1J4 to 2% pounds
of coal per kw-hr. Fig. 2 is a similar curve for isolated plants
and is drawn from published data. Coal for heating or manufacturing
processes is not included. If all the load of these isolated plants
(Fig. 2) could be taken over by the central stations (Fig. 1), the
minimum saving in coal would be about 40 per cent. If the load
could be taken over by some of the larger central stations, the
saving would be from 40 to 60 per cent. Fig. 3 is an approximate
comparison of fuel consumption (under test conditions) i /2 tS /,
/S Mitlion /tiiowatt tiours Output per Yeor Fig. 2. Coal
Consumption of Isolated Power Plants (a) Actual test on 500-kw.
isolated plant, reciprocating engine (condensing). (b) Possible
economy based on remodeling boiler plant of (a). (c) Small
turbo-generator plant. (d) Large modern turbo-generator plant. (c)
Typical fuel consumption curve for a small turbo-generator such as
is used by small central stations. (d) Same as (c) except for a
large modern turbo-generator such as is used by large central
stations. The fuel consumption of an electric power plant is
affected to a considerable extent by the peak or maximum load which
must be carried for a short time, and also by the size of the
installation required to care for the maximum probable load. The
diversity-factor, which is the ratio of the maximum ..
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