The pressure and temperature at the start of compression for a 4.0 liter, 6-cylinder, four-stroke SI engine with a compression ratio of 12.39:1 are 85kPa and 32C respectively. Propane (C3H8) with a heating value of 46,300 kJ/kg is burned with 25% excess air. The air has a water vapor mass fraction of 0.0120, and the cylinder at the start of compression retains 7.5% exhaust residual by mass. Under these conditions, there is an ignition delay of 0.7ms (time it takes the first 5% of fuel to burn). Find the rate of heat addition (in kW) during the ignition delay phase of combustion. The pressure and temperature at the start of compression for a 4.0 liter, 6-cylinder, four-stroke SI engine with a compression ratio of 12.39:1 are 85kPa and 32C respectively. Propane (C3H8) with a heating value of 46,300 kJ/kg is burned with 25% excess air. The air has a water vapor mass fraction of 0.0120, and the cylinder at the start of compression retains 7.5% exhaust residual by mass. Under these conditions, there is an ignition delay of 0.7ms (time it takes the first 5% of fuel to burn). Find the rate of heat addition (in kW) during the ignition delay phase of combustion