2. Suppose a new fuel cell is proposed, working on the gas-phase reactionCO + 02 → CO₂1(such devices already exist in the solid state this question will assume just gas phasereactions etc). If the device is to operate at a temperature of 400K and initially at a pressureof 1 bar:(a) Calculate the open circuit voltage produced by the fuel cell(b) Calculate the mass flow rate (in kg/hr) of CO required to produce a power output1kW(c) Calculate the entropy change of the system during the reaction(d) Calculate the heat rejected to maintain isothermal conditions(e) Calculate the irreversibility arising as a result of the fuel cell's operation.(f) As part of the design revision, the operating pressure is raised to 35bar, with the temperaturemaintained constant. Repeat steps 1-5; what observations do you make?

Key references: Fu, S., Ye, L., Shen, F., & He, Y. (2023). Efficiency Maximization of a Direct…

Answered: 2. Suppose a new fuel cell is proposed,…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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2. Suppose a new fuel cell is proposed, working on the gas-phase reaction 1 → - CO₂ (such devices already exist in the solid state this question will assume just gas phase reactions etc). If the device is to operate at a temperature of 400K and initially at a pressure of 1 bar: (a) Calculate the open circuit voltage produced by the fuel cell [4 marks] (b) Calculate the mass flow rate (in kg/hr) of CO required to produce a power output 1kW [1 mark] (c) Calculate the entropy change of the system during the reaction (d) Calculate the heat rejected to maintain isothermal conditions (e) Calculate the irreversibility arising as a result of the fuel cell's operation. [2 marks] [3 marks] [5 marks] (f) As part of the design revision, the operating pressure is raised to 35bar, with the temperature maintained constant. Repeat steps 1-5; what observations do you make? [10 marks]
2. An automobile engine is being operated with pure methyl alcohol using 10% excess air over that necessary for theoretical combustion and securing substantially complete combustion of the fuel. A sample of the exhaust gases is removed from the exhaust pipe and carefully analyzed in the Orsat. What analysis would you Suspect to get? 3. Assume that in the operation of the engine in the previous problem, the air supply is reduced below in the theoretical value to the point such that 90% of the carbon in the fuel burns to CO2 and the remaining to CO. Assume also that under these conditions, the hydrogen in the gaseous combustion products is 40% of the CO in them, the oxygen being all consumed. Calculate the following: a. The Orsat analysis for the gases from the exhaust pipe b. The pounds of dry air required per pound fuel burnt c. The cubic feet of dry air that must be supplied to the engine per pound of fuel bumt, on the assumption that the barometer is normal and the air temperature is…
Question 1: The PV diagram shown below applies to 2.1 moles of an ideal diatomic gas. (a) (b) Calculate temperature at all points Calculate the heat transferred along paths AB, BC, CD and, DA. (atm) 40 A D V (m') 0.01 0.05 Question 2: Consider an engine with efficiency of 25%. How much must the temperature of the hot reservoir increase, so that the efficiency increases to 50%. The temperature of the cold reservoir remains at 5°C
Prob. # 3] A producer gas has the following percentage volumetric composition: CO2 = 10.8 %,CO = 18.3 %, CH4 = 3.10 %, O2 = 0.10 %, H2 = 12.9 %, N2 = 54.6 %, and C2H4 = 0.20.Calculate: a) the weight analysis by elements; b) the weight analysis by compound; and c) theair-fuel ratio for an excess air of 35 %.
The heating value of the a dry fuel is 18 MJ/kg. a) Calculate the effective heating value of a fuel with 40% moisture and no flue gas condensation. b) Calculate the heating value of a fuel with 40% moisture and flue gas condensation Evaporation enthalpy H=2257 kJ/kg. Cp=4,2 ( kJ/kg,K) The heating value of a moist fuel is given by this formula: H=H0*(1-f)-f*2,6 (MJ/kg), H0=heating value of dry fuel, f=fraction of water.
Q4: Sulphur dioxide produced by the combustion of sulphur in air is absorbed in water. Pure SO₂ is then recovered from the solution by steam stripping. Make a preliminary design for the absorption column. The feed will be 5000 kg/h of gas containing 8 per cent v/v SO₂. The gas will be cooled to 20°C. A 95 per cent recovery of the sulphur dioxide is required. Use Cornell's method. Data: NOG-8, Mwt gas-29, Water flow rate=29.5 kg/s, Fp = 170 m¹, Py = 1.21 kg/m³, pressure drop 20 mm H₂O/m packing, HL= 10-3 N s/m², D₁ = 1.7 x 10⁹ m²/s, D, = 1.45 x 10-5 m²/s, y = 0.018 x 10³ Ns/m² Useful formulas: HG = 0.011 h (Sc)0.5 Dc 0.305/ H₁ = 0.305 h (Sc)2.5 K3 1.11 Z 3.05/ Z 9/1 0.15 0.33 3.05/ / (Lw f1f₂f3)0.5
please solve breifly In an engine test the dry volumetric analysis of the products was CO2 0.0527, O2 0.1338 and N2 0.8135. Assume the fuel is a pure hydrocarbon and that it is completely burnt. Write the complete balance chemical equation on volume basis. Estimate: The ratio of carbon to hydrogen in the fuel by mass. The air/fuel ratio by Assume the percentage of nitrogen in air is: 76.7% by mass and 79% by volume (or mole). Please : Do not solve this problem in tabulated form, otherwise your answer will be considered totally wrong.
Assignment 4 Eхample A gas mixture has the following composition by volume: 20% N, 30% CO, 50% CH. Other data: For N, C,1 = 1.0414; CO, C = 0.8452; CH,, C = 2.1377 → kJ/kg K Find for the mixture (a) molecular weight (b) gas constant (c) gravimetric analysis (% by mass) (d) k %3D
In a furnace the fuel and air are burnt at atmospheric pressure of 1 bar temperature and of 17°C. The temperature attained by the hot products is 1817°C. Find the availability of products of combustion. Assume, Cp = 1.0 kJ/kg K. %3D
In the engine of a car that uses petrol as fuel, when the piston is at its highest position, air at 10 bar and 100°C enters the cylinder. Without any change in the volume, ignition occurs, and the air temperature rises to 1500°C. What is the air pressure after the ignition? (Select the closest value)[Whenever necessary, assume air as an ideal gas and consider R = 287 J/(kg.K).]
3.1 Calculate the theoretical air/fuel and fuel/air ratios for the complete combustion of ethanol (C,H5OH). If the air is supplied at 1 bar and 25°C, calculate the volume of air required for complete combustion of fuel per kg and per kg mole of fuel.
/ For the reaction bellow, find the mole fractions of all spices. If KP-0.3 A 2B + C

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