Fuel Cell Systems Explained
Wiley Europe College Titles

Material for Students
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9


CHAPTER 9
  1. The most important formulas in this chapter are probably equations 9.6 and 9.7 on page 315. Apply these formula to the inlet air and natural gas in the system of Figure 11.9 on page 384. The electrical power used by the two compressors is given near the bottom of page 385. Use this to calculate the efficiency assumed by the Aspentech® simulator.

    N.B You will need to find the heat capacity and γ, the ratio of the specific heats, for methane. They are quite different to the values for air. For methane γ = 1.31. The specific heat capacity can be calculated from the molar value given in Table 8.1.

  2. Use equation 9.4, to estimate the exit temperature of the methane and air as they leave their compressors of Figure 11.9. Comment on the given temperature of 70oC for gas stream 16 as it reaches the fuel cell. (N.B. there will be some heat loss as it goes along the pipe from the compressor to the fuel cell.)

  3. In question 11 of Chapter 4 one of the solutions to the problem of the exit gas being too wet is to increase the air flow, and thus raise the stoichiometry, which is about 1.4, to about 2.5. (N.B. This is not necessarily the best solution.) What effect would this have on the power consumed by the compressor? Would it affect the temperature of the air leaving the compressor?
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