Enthalpy of Combustion for Complete Combustion of Methane - Engineering Assignment Help

Assignment Task

Task
1-Determine the reaction equation, molar and mass air/fuel ratio for the combustion of C4H10 with a) 100% theoretical air, and b) 50% excess air.
2. Determine the reaction equation, volumetric analysis of the combustion products, mass fuel/air ratio, and dew point temperature of the products for the combustion of C3H8 with 61% excess air. The reactants and the products are at standard reference state 
3. Determine the enthalpy of combustion for the complete combustion of Methane (CH4) gas with theoretical air. Consider the reactants and the products are at 25°C and 1 atm pressure, and the water exists in liquid state in the products.
4. An ideal Otto cycle has a compression ratio of 9.2 and uses air as the working fluid. At the beginning of the compression process, air is at 98 kPa and 27°C. The pressure is doubled during the constant-volume heat-addition process. Accounting for the variation of specific heats with temperature, determine (a) the amount of heat transferred to the air, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle.
5. Consider a simple ideal Brayton cycle with air as the working fluid. The pressure ratio of the cycle is 6, and the minimum and maximum temperatures are 300 and 1300 K, respectively. Now the pressure ratio is doubled without changing the minimum and maximum temperatures in the cycle. Determine the change in (a) the net work output per unit mass and (b) the thermal efficiency of the cycle as a result of this modification.
6. The net work output and the thermal efficiency for the Carnot and the simple ideal Rankine cycles with steam as the working fluid are to be calculated and compared. Steam enters the turbine in both cases at 10 MPa as a saturated vapor, and the condenser pressure is 20 kPa. In the Rankine cycle, the condenser exit state is saturated liquid and in the Carnot cycle, the boiler inlet state is saturated liquid. Draw the T-s diagrams for both cycles.
7. An ideal gas with k = 1.4 is flowing through a nozzle such that the Mach number is 2.4 where the flow area is 25 cm2. Assuming the flow to be isentropic, determine the flow area at the location where the Mach number is 1.2. 

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