Reheat factor
for a multi-stage steam turbine is the ratio of :
Inlet temperature to the exit temperature
Cumulative
enthalpy drop to the total isentropic enthalpy
Total
isentropic enthalpy drop to the total entropy increase
Total
isentropic enthalpy drop to the exit temperature
Cumulative
enthalpy drop to the total isentropic enthalpy
In any
multistage steam turbine with continuous expansion through the stages, the
cumulative heat is the sum of the heat drops in the individual stages. There heat
factor is the ratio of the cumulative heat to the adiabatic drop
from initial condition to exhaust pressure.
For multi-stage steam turbine :
It depends on
:
1. Stage
efficiency
2. Initial
pressure and condition of steam
3. Final
pressure
In increases
with the increase in number of stages. The value of reheat factor varies from
1.02 to 1.06.
Hence, the
correct option is (B).
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