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4. (Barbir Chp6 Problem 1) Determine the required number of cells and cell active area for a fuel cell stack that has to generate 50 kW at 120 V. Polarization curve may be approximated by: Vel 0.85 -0.2i (where i is in A/cm). The stack should have efficiency of 0.5. (Answer: 162, 764.5 cm³)

4. (Barbir Chp6 Problem 1) Determine the required number of cells and cell active area for a fuel cell stack that has to generate 50 kW at 120 V. Polarization curve may be approximated by: Vel 0.85 -0.2i (where i is in A/cm). The stack should have efficiency of 0.5. (Answer: 162, 764.5 cm³)

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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4. (Barbir Chp6 Problem 1) Determine the required number of cells and cell active area for a fuel cell stack that has to generate 50 kW at 120 V. Polarization curve may be approximated by: Veel = 0.85 - 0.2i (where i is in A/cm'). The stack should have efficiency of 0.5. (Answer: 162, 764.5 cm') 5. (Barbir Chp6 Problem 2) For an H/O; fuel cell polarization curve determined by the following parameters: T-60°C, P-101.3 kPa, ig-0.002 mA/cm, R-0.21 Ohm em?, i-2 A/cm', ilow=1.2 mA/cm', determine the efficiency at 0.6V and 0.7V. Also, determine the efficiency at 20% of nominal power for both Vnom 0.6V and Vaom-0.7V. (Answer: 0.404, 0.471, 0.560, 0.571)
Transcribed Image Text:4. (Barbir Chp6 Problem 1) Determine the required number of cells and cell active area for a fuel cell stack that has to generate 50 kW at 120 V. Polarization curve may be approximated by: Veel = 0.85 - 0.2i (where i is in A/cm'). The stack should have efficiency of 0.5. (Answer: 162, 764.5 cm') 5. (Barbir Chp6 Problem 2) For an H/O; fuel cell polarization curve determined by the following parameters: T-60°C, P-101.3 kPa, ig-0.002 mA/cm, R-0.21 Ohm em?, i-2 A/cm', ilow=1.2 mA/cm', determine the efficiency at 0.6V and 0.7V. Also, determine the efficiency at 20% of nominal power for both Vnom 0.6V and Vaom-0.7V. (Answer: 0.404, 0.471, 0.560, 0.571)
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