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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. 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]

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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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]
Transcribed Image Text: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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