Chapter 7, Problem 7.29CU

Benzene gas (CaHs) at 25°C, I atm enters a combustion chamber operating at steady state and burns with theoretical air entering at 25°C, 1 atm. The products exit at 980 K. (a) Write the balanced chemical equation of the complete combustion of Benzene with the theoretical amount of air. ¶zb 6=2b -3 (b) Determine the mass flow rate of the fuel, in kg/s, to provide heat transfer at a rate %3D of 1000 kW. Q-aH [ Take: Air: O2 +3.76 N2 M(air)= 28.97 kg/kmol M(CH«) = 78.11 kg/kmol The Nitrogen is inert.

In a nutshell Give four advantages and disadvantages of using and handling solid fuels as compared to liquid and gaseous fuels. Advantages 1. 2. 3. 4. Disadvantages 1. 2. 3. 4.

What specific changes to the Earth's greenhouse effect (atmospheric composition) affect global warming?

The following gravimetric analysis on an ash and moisture free basis of a kilogram of Fuel oil are the following: C=87%; H=12%; N=2%, S=2%; and O=6%. The yields on the burning of the same fuel are in the following Orsat Analysis: C02=11%; CO=2%; 02=4.5%; and N2=82.5%. 1) Calculate the mass of dry flue gas in kilogram.2) Determine the mass of the ideal air in kilogram of air. 3) Determine the percent of excess air.

Show your complete solution and answer to the given problem. Please also include schematic diagram.Thank you.

QUESTION 7 (Fuels and Combustion) (a) The volumetric analysis of the flue gases from a boiler consists of CO2 = 10.9%, co = 1%, O2 = 7.1% and N2 = 81.0%. Determine the mass of the flue gas per kg of burnt fuel. (b) The mass analysis of a flue gas is: CO2 = 21.6%, CO = 2.2%, O2 = 1.7% and N2 = 74.5%. Determine the mass of the flue gas per kg of burnt fuel.

Fill in the tables related to H2O in your Tables book of the properties left blank in the table given below. Show the transactions related to the features you find on your paper.    T (C)          P (kPa)         h (kJ/kg)         x          phasea.  200                                                   0.95b. 140                                  1800c.                     950                                  0d.                     800             3162,2

Which of the following is the correct statement?   a. Irreversible engines have maximum efficiency   b. The increase in entropy is obtained from a given quantity of heat at a low temperature   c. The entropy represents a maximum amount of work obtainable per degree drop in temperature   d. All the reversible engines have the same efficiency   e. All the reversible and irreversible engines have the same efficiency   f. The change in entropy may be regarded as a measure of the rate of the availability of heat for transformation into work   g. All engines are designed as reversible to obtain maximum efficiency

Define the following 1. Application of thermodynamics in Mechanical Engineering. 2. Air-Fuel ratio. 3. Second Law of thermodynamics 4. Importance of fuel byproduct analysis. 5. Entropy and supersaturation.