An assumption for turbine expansion lines originally made by Salisbury and Haywood (that the difference between local steam enthalpy and the enthalpy of saturated water at the same pressure is constant throughout the expansion) is used in approximate analyses of steam combined heat and power plant. Thermal efficiencies and energy utilization factors are derived for a number of cycles with steam extraction for feed heating and for district heating. Calculations of these two parameters are presented for relatively low pressure cycles.
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References
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