A fuel consists of 75% mol methane 25% mole of ethane enters an oven with 80%
excess air at 30 degrees Celsius. If 8 x 10 ^ 5 kJ per kg mol of fuel is transferred as heat to the boiler tubes, at what temperatures do the combustion gases from the furnace come out? Assume combustion
complete

* The steps of the solution of the thermodynamics book edition 7 are not accepted.

* Do the exercise step by step please.

* With clear formulas to know where each number comes from (result).

what is a reversible versus irreversible path and why is a reversible path useful while being physically impossible. what makes a reversible path impossible?

For eutectoid steel:

b) Sketch the thermal history (i.e., path) and calculate the final microstructure when the steel has the following heat treatment sequence : i) instantaneously quenched from 850 C to 300 C, ii) held at 300 C for 1 hour, and iii) air cool to 20 C. (Materials science)

A packed bed reactor is filled with catalyst material with a diameter of 1.5 mm. The length of the reactor is 80 cm and the catalyst has a porosity of 0.45. The superficial mass velocity of the inlet gas is 7.5 kg/m2-s with a viscosity of 1.55x10-5 kg/m-s and a density of 2.8 kg/m3. The inlet pressure is 300 kPa. Find the pressure, P, at the end (the exit) of the PBR.

A tank containing air at atmospheric pressure must be purged with pure nitrogen until the oxygen concentration is 5 ppm. The tank can withstand a vacuum, so vacuum purging is considered. The vacuum line used produces an absolute pressure of 6 mmHg. How many vacuum cycles are necessary?

A high grade fuel oil which consists of only hydrocarbon, CxHy is burnt in a combustion chamber at 25 °C. The standard heat of combustion is -43,515 J/g with CO2 (g) and H2O (l) as products. The temperature of the fuel and air entering the combustion chamber is 25 °C. The air is assumed dry. The flue gases leave at 300 °C and their average composition is 11.2 % CO2, 0.4 % CO, 6.2 % O2 and 82.2 % N2 based on dry basis.
Solve the following problems using a basis of 100 mol dry flue gases.

(a) Determine the molecular composition and mass of the fuel oil, CxHy.

(b) Determine the heat of combustion that is absorbed/released from the combustion chamber.

Steam at 4 MPa and 350°C is expanded in an adiabatic turbine to 120 kPa. What is the isentropic efficiency of this turbine if the steam is exhausted as a saturated vapor?

A CMFR is operating at steady state with a second order decay reaction of rate constant k2=0.5 L/mg/d. It is exactly meeting its goal of 99.9% removal efficiency and the allowed maximum effluent concentration of 0.05 mg/L. The volumetric flow rate is 450 m3Id.

a. What is the influent concentration in mg/L?

b. What is the reactor volume in m3? What volume would be required if the removal efficiency goal were 99.0%? c(5). If the CMFR is replaced with a PFR, what reactor volume is needed (in m3)?

In microfiltration what is Dependence of the TMP on the permeate flow, liquid viscosity, membrane resistance, and cake resistance.

With the aid of a diagram explain how a thermal desorption-gas chromatography-mass spectrometer functions for the analysis of VOCs.

True or False

The change in enthalpy of a hypotehtical reversible process and the change in enthalpy of it's representative actual processes are equal?

Entropy production is greater for an irreversible process than a reversible process?

Discuss why cathode flow channel design is less important for SOFCs than for PEMFCs. Hint: Consider the typical operating temperature of a SOFC and its effect on jL.

A double pipe heat exchanger is to be designed to cool 5 gal/min of hot oil from 250°F to 120°F using 10 gal/min of cooling water available at 70°F. The heat exchanger is to consist of sections of 0.75 inch 16 BWG copper tubing inside 1.5 inch 16 BWG tubing; the water flows in the annular space. The shell-side heat transfer coefficient for this system is known to be 737 Btu/hr×ft²×°F.

a) Estimate the required length of the countercurrent exchanger, neglecting the resistance of the tube wall in your calculations.

b) Estimate the required lengthof the exchanger if operated co-currently

The following data are available:

Wall thickness for 16 BWG = 0.065 in.