In design of super critical thermal power units no latent heat is absorbed in Boiler furnace by the circulating power cycle fluid: steam/water since it is being operated above 225 kg/sq.cm. How much it is contributing in enhancing the efficiency of the super critical units in this way?
The irreversibility due to heat transfer between the hot gases and the working fluid (steam) can be reduced be eliminating the phase change process in the steam generator.
Since the phase change for pure water takes place at constant temperature, the temperature difference between the hot gas and the working fluid in this case is relatively high.
By continuous heating the working fluid, the temperature difference decreases and that would reduce the irreversibility and hence improves the thermal efficiency.
The mean heat absorption temperature increase and the mean heat release temperature does not change or decrease, their the thermal efficiency increase.
Dear Xianglong Luo, Can you please elaborate your idea on increase of efficiency in super critical thermal power unit, in which no latent heat is absorbed by steam in steam generator. How is it working to improve efficiency other than a sub-critical unit?
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