For a new analytical model of the heat load duration curve of a heat supply system, the problem of determining the full load duration, TM - for the whole curve as well as per considered time intervals, is addressed. The proposed model offers a better quality of actual consumption curves approximation; it includes two components - a power function (Sochinsky-Rossander) and a modified logistic function for which, in essence, their integrals are searched for. Determination of TM time duration

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... s calculating the load factor and the annual energy consumption.