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Lab Report

by: Bryan Wilson

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This 3 page Class Notes was uploaded by Bryan Wilson on Saturday March 26, 2016. The Class Notes belongs to 1234 at 1 MDSS-SGSLM-Langley AFB Advanced Education in General Dentistry 12 Months taught by jim in Spring 2016. Since its upload, it has received 55 views. For similar materials see engineering in Engineering and Tech at 1 MDSS-SGSLM-Langley AFB Advanced Education in General Dentistry 12 Months.


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Date Created: 03/26/16
 ENED 1020: Engineering Foundations                                               Final Hands­on Experiment Fuel Cell Car Lab Report Intro Electric cars have begun to storm the market in the past few years due to their being an effective  and cleaner alternative to the non­renewable resources we depend on. Fuel cell cars have also  been considered an alternative, but have received less attention because of the lack of refueling  stations for these novel vehicles. In this experiment, we look to explore the comparative  efficiencies of electric and hydrogen powered cars. We will do this by using electricity to power  a car to travel a distance of 15 feet, and then use electricity to produce hydrogen to power a car  for 15 feet, and compare the amounts of power required in each case.  Procedure 1. Retrieved the fuel cell kit 2. Measured and recorded the voltage and resistance supplied by the DC battery pack 3. Connected the battery pack to the vehicle chassis 4. Turned on the car and let it travel 15 feet, recording the time it took to travel this distance 5. Measured the voltage and resistance supplied by the AC outlet 6. Set up the electrolyzer to collect hydrogen Figure 1: Set up to collect hydrogen 7. Collected 25cm  of hydrogen using an AC outlet to power the electrolyzer and recorded  the time taken to collect this hydrogen 8. Hooked up the fuel cell and hydrogen storage tank to supply power to the vehicle chassis Figure 2: Set up to run vehicle chasis off collected hydrogen  ENED 1020: Engineering Foundations                                               Final Hands­on Experiment 9. Make sure to record the amount of hydrogen in the tank after you remove and replace the  cap on the hydrogen side as you will lose a small amount of hydrogen in this step 10. Recorded starting amount of hydrogen in the storage tank 11. Turned on the car and let it run approximately 15 feet 12. Recorded the amount of hydrogen after the trial was run 13. Returned all supplies  Results We measured the voltage and resistance of each power source. From this we calculated the  current of each power source using the equation: I = V/R We then calculated the power each source used using the equation: P = I x V The time taken for the car to travel 15 feet on the DC pack was recorded, but for the H2, we  calculated the time it took to create the H2 that the car used to travel the 15 feet. We recorded  3  that the car used 2 cm of H2 to travel 15 feet, and that it took 7 minutes or 420 seconds to create  25 cm of H2. To figure out the time taken to create 2 cm  of H2 we set up the proportion: 25 cm /420 second = 2cm /x seconds And solved for x. We then were able to calculate the work done by each power source in order to move the car 15 feet by using the equation: Work = Power x Time  ENED 1020: Engineering Foundations                                               Final Hands­on Experiment All of our results are given in the table below. Table 1: Data from Fuel Cell Car Experiment It can be seen from the data that the H2 used only 1.8e­4 J to move 15 feet, while the DC battery  pack used 27.55 J to complete the same task. From this, it is apparent that the H2 car is  approximately 153,000 times more efficient than the electric powered car. Discussion The results we derived from our experiment provide exciting information for those in favor of  using hydrogen powered vehicles. Translating our results to a higher scale, our results say that  the amount of work done to move a car one mile could be used to create 107,751 liters of  hydrogen, which could make the same car go 808,133,333 miles.  However, I believe that our results are extremely inaccurate because that makes no sense at all. I  think the main point where we went wrong was in our measurement of the resistance of the  electricity used to create our H2. 11.4 Mega ohms is a very extreme value compared to the rest of the measurements that we took. Therefore, our data is extremely inaccurate and no useful  conclusions can be drawn from it.  Summary  Still, there are reasons that have been found that fuel cell cars are favorable over electric cars.  For example, electric cars still have polluting emissions while fuel cell cars only emit water.  Also, hydrogen powered cars do have three to four times more range than electric cars .  1 Although our experiment did not test or verify either of these facts, they are both known reasons  why hydrogen powered cars may surpass electric cars in popularity. 1.­hydrogen­or­electric­vehicles­ story.html


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