Question $2$

$(7$ marks$)$

Consider a steam power plant operating on the ideal reheat Rankine cycle. Steam enters the high$-$pressure turbine at $15$ MPa and $600C$ and is condensed in the condenser at a pressure of $10$ kPa $.$ If the moisture content of the steam at the exit of the low$-$pressure turbine is not to exceed $10\mathrm{.}4\%.$

Determine $($a$)$ the pressure at which the steam should be reheated and $($b$)$ the thermal efficiency of the cycle. Assume the steam is reheated to the inlet temperature of the highpressure turbine.

$10$KPa

$p_6=R_1$

$P_2,x_6=1-$ mois ture

$T_3=1-\frac{10\mathrm{.}4}{100}=0\mathrm{.}896$

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