Power Plant Equipment

In a test for four-cylinders four-stroke engine: diameter=100 mm, stroke=120 mm, speed=1800 rpm, fuel=0.2 kg/min, CV=44000 kJ/kg, tension difference=40 kg, brake circumference=300 cm, mechanical efficiency=90%. Determine: i) Brake thermal efficiency ii) Indicated thermal efficiency iii) IMEP iv) BSFC.

Air is drawn in a gas turbine unit at 15°C, 100 kPa and pressure ratio is 7:1. Compressor is driven by HP turbine and LP turbine drives a separate power shaft. Isentropic efficiencies of compressor, HP and LP turbines are 0.82, 0.85 and 0.85. Maximum temperature=610°C. Calculate: a) Pressure and temperature entering LP turbine b) Net power per kg/s c) Thermal efficiency. [Cp=1.005 kJ/kg·K, γ=1.4 (compression); Cp=1.15 kJ/kg·K, γ=1.333 (expansion)]