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

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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]
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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…
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 %.
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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
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 m, py= 1.21 kg/m³, . pressure drop = 20 mm H₂O/m packing, HL= 10-³ N s/m² D₁ = 1.7 x 10-9 m²/s, Dy = 1.45 x 10-5 m²/s, y = 0.018 x 10-3 Ns/m² Useful formulas: HG = 0.011 Uh (Sc)85 (0 0.305, H₂ = 0.305 h (Sc) 0,5 K3 1:11 Z 3.05, 0.33 Z (305) /(Liv f₂f2₂63) 0.5 0.15 3
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.
A-c please
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

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