Energy Ratio

Overview

Engineering reference data for Energy Ratio in thermodynamics.

Key Formulas

First Law

$\Delta U = Q - W$

Energy is conserved — heat added minus work done.

Ideal Gas Law

$PV = nRT$

Relates pressure, volume, and temperature of an ideal gas.

Heat Transfer

$Q = mc\Delta T$

Sensible heat transfer.

Carnot Efficiency

$\eta = 1 - T_C/T_H$

Maximum efficiency between two temperatures.

Variables

Additional Key Formulas

The relationship between energy output, input, and balance is expressed by: $E_o = \Delta E + E_i \quad (1)$

The energy ratio (or energy payback ratio) is the system's energy output divided by its energy input: $ER = \frac{E_o}{E_i} \quad (2)$

Additional Variables

• ΔE: Energy balance
• E₀: Energy output
• Eᵢ: Energy input
• ER: Energy ratio (dimensionless)

References

• Original Source