Reheat factor definition in multi-stage turbines Select the correct definition of the reheat factor (RHF) in terms of heat drops. Choose the correct option.

Concept
Reheat factor (RHF) accounts for the fact that in multi-stage turbines with reheating/expansion, the sum of actual stage heat drops is slightly greater than the overall isentropic heat drop between inlet and exhaust conditions.

Definition
RHF = (Cumulative (actual or isentropic stage) heat drop) / (Overall isentropic heat drop)

Implication
RHF is typically slightly above 1 for practical turbines.

Final Answer
Ratio of cumulative heat drop to the isentropic heat drop