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# Maximal Thermal Efficiency of Steam Turbine Cycle with two Pre-heaters

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Maximal Thermal Efficiency of  Steam Turbine Cycle with two Pre-heaters

Author: Valery Ochkov (http://twt.mpei.ac.ru/ochkov/v_ochkov.htm)

 Introduction This application calculates the maximal thermal efficiency of a steam turbine cycle with two pre-heaters: find the optimal p_2 and p_1 values.

Water/Steam Properties (wsp)

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Specific entropy of water or steam as function of pressure and temperature

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Specific enthalpy of water or steam as function of pressure and temperature

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Vapor fraction of wet steam as function of pressure and specific entropy

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Specific enthalpy of water or steam as function of temperature and vapor fraction

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Specific enthalpy of water at the saturated line as function of pressure

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Specific entropy of water at the saturated line as function of pressure

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Specific enthalpy of water or steam as function of pressure and specific entropy

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Temperature of water or steam as function of pressure and specific entropy

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Functions for processes steam expansion and water compression

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Input Data

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Calculations

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The thermal efficiency of a steam turbine cycle without pre-heaters (variant 1).

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 (4.1)

The thermal efficiency of a steam turbine cycle without pre-heaters  (variant 2).

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 (4.2)

The thermal efficiency of a steam turbine cycle with one pre-heater at p_2=p_1= 7 MPa

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 (4.3)

The thermal efficiency of a steam turbine cycle with two pre-heaters at p_2=7 MPa and p_1=3 MPa

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 (4.4)

Function for the 3D-plot: p_2 must be > p_1

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Create the surfase plot

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Calculate the maximal thermal efficiency of a steam turbine cycle with two pre-heaters (see the 3D-plot above): find the optimal p_2 and p_1 values (pascal)

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 (4.5)
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