Distribution of Regenerative Heating of Feedwater by an Analytical Method and by Using the ″Indifferent″ Point.

The problem of distribution of regenerative heating of water by stages in plants with intermediate steam superheating is reconsidered. A formula relating the heating in a ″cold″ tau //1 and a ″hot″ tau //2 stage of regenerative feedwater heating is recalled. A hitherto unpublished derivation of this formula under the condition of a linear dependence of steam condensation heat of turbine bleeds on water enthalpy at saturation q//r equals f(i prime //r) //is presented. The simplest case, where the number of feedwater heating stages z equals 2, is considered. Full agreement between both methods of optimal distribution of regenerative water heating is shown.