Q2) In a non-insulated combustion chamber, C3H8 (liq.) is mixed and burned with air. C3H8 (liq.) enters the chamber at a constant rate of 3kg/ hour and at a temperature of 77F, while the air flows steadily at 70.8kg/ hour and 7C. The combustion gases exit at 1500K. The equation for the combustion process is: C3H8(liq.)+7.5(O2+3.76N2)2.7CO2+0.3CO+4H2O+2.65O2+28.2N2 The air and the combustion products can be assumed to behave as ideal gases (hence, h=h(T) ). Kinetic and potential energies are negligible. Use the property tables provided. i) Draw a simple sketch of this process, annotating the following on the sketch: a. the boundaries of the control volume (combustion chamber); [2] b. the entering reactants and the exiting products; c. the direction of the heat transfer between the control volume and the surroundings. ii) Verify that the equation provided for the combustion process is balanced by showing the comparison of numbers of atoms of each element on the left and on the right. [2] iii) Write the steady-flow energy balance applied to the combustion chamber per unit mole of fuel, as a function of enthalpies of formation and sensible enthalpies. iv) Determine the heat transferred from the combustion chamber to the surroundings, per kmol of fuel (in kJ/kmolfuel) v) Determine the rate of heat transfer from the combustion chamber to the surroundings, for the given mass flow rate of fuel (in kW ). [5] Hint: For C3H8 (liq.), the enthalpy of formation is 118,910kJ/kmol and the sensible enthalpies at the temperatures of interest are nil