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homework4 - ECHM/EBIO 442 Laboratory I Fall 2013 Homework#4...

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ECHM/EBIO 442: Laboratory I Fall, 2013 Homework #4 Due at 10am in COBL 310 (Dr. Heys’ office) on Thursday, Sept. 26, 2013 A laboratory report written at some point in the past is attached. Your assignment is to evaluate this report from both a presentation and technical standpoint. As you read through the report, identify as many errors or deficiencies in the presentation and technical content as possible using a distinct color of ink (i.e., not black). Finally, please answer the following questions. 1. Would you change or remove any of the figures? 2. Would you suggest adding any figures? 3. Did the results support the conclusions? 4. Was the statistical analysis valid? 5. Using only this lab report, could you repeat the experiment?
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Fuel Cell Lab Report EĂŵĞƐƌĞŵŽǀĞĚ Abstract: The objective of this report was to evaluate the performance of three fuel cells by quantifying the resistance related efficiency losses of each one. Other efficiency losses due to limits in reaction rate and gas transport were ignored. It was found that fuel cell number two had the greatest performance, while fuel cell number three had the poorest. A comparison was made to determine if the resistance efficiency losses were the same for the three fuel cells in the experiment conducted in this lab. Statistical analysis confirmed that the resistance losses varied from cell to cell. An additional comparison was made between the results of this experiment and the results of another groups’ experiment. This was meant to test for repeatability, and statistical analysis showed that the experiment was repeatable.
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Introduction: dŚĞƉƵƌƉŽƐĞŽĨƚŚŝƐƐƚƵĚLJǁĂƐƚŽĞǀĂůƵĂƚĞƚŚĞƉĞƌĨŽƌŵĂŶĐĞŽĨƚŚƌĞĞĚŝĨĨĞƌĞŶƚůŽǁƚĞŵƉĞƌĂƚƵƌĞŚLJĚƌŽŐĞŶ ĨƵĞů ĐĞůůƐ͘ The Ğ xperimental objectives for this lab were to determine the characteristic curves and evaluate the performance of the fuel cells by calculating the resistance losses in the ohmic polarization region for each one. dŚĞĐĂůĐƵůĂƚĞĚƌĞƐŝƐƚĂŶĐĞǁŝůůďĞĂƉĞƌĨŽƌŵĂŶĐĞƉĂƌĂŵĞƚĞƌƵƐĞĨƵůĨŽƌĐŽŵƉĂƌŝŶŐƚŚĞ ŽƉĞƌĂƚŝŶŐĞĨĨŝĐŝĞŶĐŝĞƐĂŶĚŽǀĞƌĂůůƉĞƌĨŽƌŵĂŶĐĞŽĨƚŚĞĨƵĞůĐĞůůƐ͘dŚŝƐǁŝůůƐŚĞĚůŝŐŚƚŽŶƚŚĞƉƌĂĐƚŝĐĂů ĂƉƉůŝĐĂƚŝŽŶƐĨŽƌĞĂĐŚĐĞůů͘ Theory: /ŶŽƌĚĞƌƚŽĐŚĂƌĂĐƚĞƌŝnjĞĂĨƵĞůĐĞůů͕ĂďĂƐŝĐƵŶĚĞƌƐƚĂŶĚŝŶŐŽĨ ŚŽǁĂĨƵĞůĐĞůůĨƵŶĐƚŝŽŶƐŝƐŶĞĐĞƐƐĂƌLJ͘±ĨƵĞů ĐĞůůĐŽŶǀĞƌƚƐĐŚĞŵŝĐĂůĞŶĞƌŐLJŝŶƚŽĞůĞĐƚƌŝĐĂůĐƵƌƌĞŶƚ͘/ƚŽƉĞƌĂƚĞƐƐŝŵŝůĂƌůLJƚŽĂƚLJƉŝĐĂůďĂƚƚĞƌLJŝŶƚŚĂƚĂ ĐŚĞŵŝĐĂůƌĞĂĐƚŝŽŶŝƐƵƐĞĚƚŽƉƌŽǀŝĚĞĂŶĞůĞĐƚƌŝĐĂůĐƵƌƌĞŶƚ͕ƚŚĞ ƉƌŝŵĂƌLJĚŝĨĨĞƌĞŶĐĞďĞŝŶŐƚŚĂƚĂĨƵĞůĐĞůů
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