wec updates 2010
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WIND ENERGY CHALLENGE:COMPETITION UPDATES
2010-2011National Engineering Design Challenge
Presented by MESA USA Committee Member:Carlos Gonzalez- Director UCR MESA Schools [email protected]
AGENDA
Event overview and scoring Device performance criteria Competition Setup Task descriptions Additional changes Questions and answers… (questions will be addressed at end of
presentation…)
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Not meant to be a thorough and detailed look and analysis of therules, but a discussion on significant changes and updatesNot meant to be a thorough and detailed look and analysis of therules, but a discussion on significant changes and updates
EVENT OVERVIEW
Device Performance 150 pointsDevices must perform two (MS) and three (HS) tasks: a power task, wind to vehicle transfer, electrical powerand wind direction
Technical Paper 100 pointsTeams will submit a 5-15 page technical paper that details the design, development, experimentationand understanding of their device.
Academic Display 100 pointsTeams will present the findings of the abovedescribed research in display format. The displayshould include items such as data (e.g. charts and graphs), photographs, drawings, other ideas, andnecessary written explanations.
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EVENT OVERVIEW
Oral Presentation 100 pointsTeams will make an oral presentation based on Investigation,experimentation, design, testing, and experiences related to their device. This presentation will be delivered to a panel of judges. After the presentation, teams will be asked questions by the judges.
Design Efficiency 50 pointsWill be calculated by dividing the total performance score bythe mass of the device in kilograms (mass of vehicle, liftedmasses and tape will not be taken into account)
Total Points 500 points
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Design efficiency will now be a consideration! Large, bulky windmills may not be recommended….Design efficiency will now be a consideration! Large, bulky windmills may not be recommended….
DEVICE PERFORMANCE
Students will build a Windmill that meets the criteria outlined in therules and is designed to perform the following tasks:
1. Mechanical Power (MS & HS): greatest mass raised 75 cm in the least amount of time. (2 trials)
2. Wind-to-Vehicle Transfer (MS & HS): greatest average speed achieved by the defined vehicle when accelerated by the energy from the device. (2 trials)
3. Electrical Power & Wind Direction Response (HS):greatest average power output from the defined generator/electrical load during a 60 degree change in wind direction. (2 trials)
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The performance criteria have remained the same…The performance criteria have remained the same…
GENERAL RULES
1. Teams must design, build and operate their own windmill device. This device will include all parts necessary to capture the wind energy and transfer it to the defined tasks. It may include multiple fan/turbine assemblies.
2. The device must be solely powered by the wind energy available from the defined commercial fan.
3. All designs that conform to the energy rules will be allowed to participate. All teams should carefully review design configuration to ensure that no additional energy is applied to the tasks.
4. Once performance competition begins, student teams may not have contact with non-competitors. Student teams are solely responsible for interaction with judges and addressing problems with their devices.
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COMPETITION SETUP
a. A six foot table will be used. Approximate dimensions of 30”x72”x29".
b. All parts of the windmill device must remain behind a line 75 centimeters from the fan.
c. The Device Area shown is intended as a platform for the devices.
d. The device may extend over the table edges to the sides and into the Working Area to complete the tasks.
e. Devices may be taped to the table or floor surfaces.
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f. Teams may not touch their device once a task trial has begun.
g. Teams will be allowed 2 minutes to configure their device before each trial.
ENERGY SOURCE & SETUP
d. The device may extend over the table edges to the sides and into the Working Area to complete the tasks.
The device may now extend over the edge, into the sides, and on the floor. The device must always be 75 cm from the fan, as shown in the drawing…
REMINDER… mass of the device will now be a consideration. Every part of the device will be weighed together… assemblies, support legs, etc.
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TASKS – MECHANICAL POWER (MS/HS)
6. Mechanical Power – Raising a Mass a. Fan speed will be set to high.b. Judge will use outlet strip to start the box fan-wind source and
start the timer. c. Judge will stop timer when entire mass is above 75 cm, and record
time.d. Judge will use outlet strip to stop box fan-wind source.e. Judges will weigh the detachable object and record the mass.f. Objects failing to reach 75 cm receive zero mass for that trial.g. Repeat procedure for 2nd trial.
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9No notable changes from last year…No notable changes from last year…
TASKS – WIND TO VEHICLE (MS/HS)
7. Wind-to-Vehicle a. The fan speed will be set to High.b. Teams will place the entire vehicle
behind the “Start Line”.c. Teams will design their device to
move the vehicle from behind the Start Line” to the “Finish Line” as shown in Figure 3.
d. Judges will use outlet strip to start box fan-wind source and start the timer.
e. Judges will stop the timer when any part of the vehicle crosses the “Finish Line” within the boundary.
f.Vehicles failing to reach the “Finish Line” or leaving the track boundary during a trial will receive zero speed for that trial.
g. Repeat procedure for 2nd trial.
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No real changes to this task…No real changes to this task…
TASKS – ROTATIONAL SPEED & WIND DIRECTION
8.Electrical Power and Wind Direction Response
a. Student teams are required to rotate the specified generator and attach to Electrical Load.
b. Fan speed will be set to High.c. Fan motion will begin in Position #1
and rotate clockwise to Position #2.d. Judge will simultaneously start the box fan-
wind source, and the Stopwatch timer.e. Starting at 10 seconds the box fan – wind
source will be slid from left-to-right at approximately 10 degrees per 10 second.
f. Judge will record the Average Power deliver to the load between 10 and 70 seconds.
g. Repeat procedure for 2nd trial.
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Although the task itself did not change, the method of measuringthe average power did…Although the task itself did not change, the method of measuringthe average power did…
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This is a snapshot of the new score sheet…
You must note that host is providing resistor…
Mass will also have to be measured for each device…
To measure average power, you will now need three measurements…(if not using an automatic measuring system)
OTHER NOTABLE CHANGES FOR 2010-11
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- Rule 9: Energy source… Has been changed to the LASKO 3733 fan, although equivalent fans will be allowed
-Rule 12: NO MORE LAMPS A 10 Ohm Resistor will now be used in place of the lamp
-Rule 16: Measuring power At the National Event, we will use Vernier Equipment and Logger Pro to measure average power. OTHER METHODS ARE ALLOWED.
NOTE: For competition hosts, I strongly recommend using an automated method to measure power. Although last year’s standard measuring set-up of multi-meters works in a classroom, measurements can be inaccurate. This year, with 3 samples needed from the multi-meters, it will more difficult still
OTHER NOTABLE CHANGES FOR 2010-11
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MESA USA Set-up
For a PC or laptop:Logger Pro $189 + Diff Voltage Probe $39 + GO-LINK $61 = $289
By using the Logger Pro 30 day demo, you may be able to save money on the PC option. Demo is available through the Vernier webpage…
http://www.vernier.com/downloads/lp3demo.html
Texas Instrument Set-upFor centers with TI calculators, data collection for the competition is very easy. Since most newer calculators come with the EasyData application (it’s a free download as well), one simply connects the EZ Link to the probe, and your set…
TI set-up: EZ Link $59 + Diff Voltage Probe $39 = $98
OTHER NOTABLE CHANGES FOR 2010-11
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Power equations: V=IxR & P=IxV then we can find power: P = V2/R(P= Watts , V= volts, I= amps, R=ohms)
OTHER NOTABLE CHANGES FOR 2010-11
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-Cost and Labor Summary
This year, we will be requiring students to complete a table summarizing essential cost and labor details of their project. Table will be included and scored as part of the “Academic Display” portion of the event.
-Drawing size
Has been changed to a smaller, 11x17 drawing, and is now worth a fraction less in the scoring.
