Abstract
Abstract This paper deals with the problem of the annual peak load in steam power plants. The use of the load-duration curve for the purpose of studying annual peak, loads is analyzed and the conclusions are drawn that (1) plant intended for annual-peak-load service should only be installed at the lowest possible first cost, and that (2) economy of peak-load equipment can be sacrificed to secure low initial cost. Various schemes that have been proposed to provide equipment for carrying the annual peak loads are analyzed. The three plans that appear most promising are those involving the use of steam accumulators, of peak-load units, and of present plant after new base-load equipment has been added. In order to indicate the possible annual savings through the application of these three methods, the author assumes an electric system with a maximum annual peak load of 200,000 kw., together with certain data for annual load factors of 65, 45, and 25 per cent on this system. With certain assumed plant costs, fuel costs, and operating performances, an analysis is made of the annual operating costs of the various methods, and the possible annual savings through the use of steam-accumulator plant or peak-load units are shown in the form of a series of curves. These savings in some cases may be of a large order.
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