# Fraction of injected heat remaining in reservoir

## Input(s)

\(Q_{i}\): Total Heat Injected (BTU)

\(Q\): Total Heat Remaining (BTU)

## Output(s)

\(E_{h}\): Fraction of the Injected Heat Remaining in the Reservoir (fraction)

## Formula(s)

\[
\mathrm{E}_{\mathrm{h}}=\frac{\mathrm{Q}}{\mathrm{Q}_{\mathrm{i}}}
\]

## Reference(s)

Prats, M. 1986. Thermal Recovery. Society of Petroleum Engineers, New York, Chapter: 5, Page: 44.