Chem-e-car

The University of Florida's 2013 AIChE Regional Conference Chem-E Car

Chem-E-Car is an annual college competition for students majoring in Chemical Engineering.

According to the competition's official rules, students must design small-scale automobiles that operate by chemical means, along with a poster describing their research. During the competition, they must drive their car a fixed distance (judged on how close the car is to the finish line) down a wedge-shaped course in order to demonstrate its capabilities. In addition to driving a specified distance, they must also hold a payload of 0-500 mL of water. The exact distance (15-30 meters) and payload is revealed to the participants one hour before the competition. The size of designed cars cannot exceed certain specifications and cars must operate using "green" methods, which do not release any pollution or waste in the form of a visible liquid or gas, such as exhaust. The dimensions of the car are to be within 20x30x40 cm. This competition is hosted in the United States by the AIChE (American Institute of Chemical Engineers),and winners of the competitions receive various awards, depending on how they placed.[1]

Awards

Regional Competition Awards (funded by AIChE)[1]

Poster Competition
  • Ribbons for 1st, 2nd, and 3rd place
  • Ribbon for Most Creative Drive System
  • Ribbon for Most Creative Vehicle Design
Performance Competition
  • 1st place: $200 and Ribbon
  • 2nd place: $100 and Ribbon
  • 3rd place: Honorable mention and Ribbon
  • Ribbons for 4th and 5th place finishers
  • Ribbon for Spirit of Competition

National Competition Awards (funded by Chevron)[1]

Past National Performance Competition Winners

Rules

The competition has various rules:[1]

Poster

Each car is required to have a poster board explaining how the car runs (power source), some of its specific features, and how it's environmentally friendly. Judges score these posters on four different things: the description of the chemical reaction and power source (20%), the creativity of the design and its unique features (20%), environment and safety features (40%), and the overall quality of the poster, along with the team's presentation (20%). Only posters judged with a score of 70% or above may move on to the performance competition. [1]

Example Reactions

Some ideas for chemical reactions have been using pressurized air (creating oxygen through a chemical reaction and allowing it to build pressure) or using electricity created by the dissolving of metals in certain acids (basic battery). One pedantic idea by Cooper Union was to use a fuel cell[2] (a cell that converts fuel to electricity via an electrochemical reaction) to power their car.

Winners in this competition aren't determined by whether their car is faster or more powerful, but how accurate their chemical reaction to stop their vehicle is. This is quite difficult, especially when the load the car must carry and distance it has to travel are unknown until the day of the competition. So teams must find a method that is flexible enough to fit a range of payloads and distances, and reliable enough so it doesn't fail with real world variables (temperature, humidity, track roughness, changes in elevation, etc.). Winners in the past have had a variety of ways of dealing with this problem, such as an "iodine clock" reaction.[3] This reaction works by using two clear solutions (many variations) that change color after a time delay (the exact time can be found experimentally). When applied to the car, the team used a simple photo sensor that could tell when the solutions changed color, at which point the cars power would shut off by cutting the circuit.[4] While the process itself is somewhat simple, accounting for the unknown variables like the payload and distance is quite difficult.

References

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