Engine Effective Thermal Efficiency (\(\xi_{\text{eff}}\)):

\[ \xi_{\text{eff}} = \frac{C \cdot N_e}{H_u \cdot B} \times 100 \]

Where:

• \(\xi_{\text{eff}}\) is the effective thermal efficiency, %.
• \(N_e\) is the effective output, watt.
• \(H_u\) is the calorific value of fuel, kCal/kg.
• \(B\) is the indicated work, kg/hr.
• \(C\) is the conversion constant.