Overall power system efficiency

Input(s)

P: Power Output (hp)

$Q_{i}$: Total Heat Energy consumed by the Engine (hp)

Output(s)

$E_{i}$: Total Heat Energy consumed by the Engine (hp)

Formula(s)

$$ E_{i}=\frac{P}{Q_{i}} $$

Reference(s)

Bourgoyne, A. T., Millheim, K. K., Chenevert, M. E., \& Young, F. S. (1986). Applied Drilling Engineering, Page: 7.