P11462: Thermoelectric and Fan System for Cook Stove

Preliminary Test Plans

Engineering Spec 1: Flow rate of air entering the stove

The flow rate of air entering the stove between 0.3 and 0.7 kg/s and will be tested using a fan test rig and flow sensor to characterize the rate at which the fan is set to run.

Engineering Spec 2: Flow control settings

The flow control should have at least 2 settings for flow rates corresponding with boil and simmer. This will be a true or false condition base on the setting available on our unit.

Engineering Spec 3: Unit price

The unit price should be no greater than $27.50. This will be tested by summing the costs of all components with best estimated values based on 10,000 unit orders.

Engineering Spec 4: Coupling time with no tools

The unit will take no longer than 10 minutes to attach to the stove without the use of any tools. This will be tested by timing an untrained persons attachment time over a series of trials to ensure a person with no prior knowledge of the system can attach it in the allowed time.

Engineering Spec 5: Removal time with no tools

The unit must be able to be removed in under 10 minutes without the use of any tools. The test procedure for this will be the same as spec 4.

Engineering Spec 6: Product life span The base unit without taking into account replaceable components will be able to function for 3 years. This will be tested through life cycle analysis due to the limited time available on this project. Engineering Spec 7: Replacement component life span

Replaceable components in the unit shall function for a minimum of 1 year before needing replacement. This will be tested in the same way as spec 6. Estimates for MTBF for specific parts will be used.

Engineering Spec 8: Aux Charging

The unit shall provide power to charge and auxiliary device. The first section of the test will be composed of a true or false assessment of the unit’s ability to provide auxiliary power. If the statement proves true then the amount of power will be measured and compared to the target power requirements.

Engineering Spec 9: Battery Size

The unit shall be able to run the fan from a cold start to aid in initial lighting of the stove. This will be tested through trial runs with cold starting the stove.

Engineering Spec 10: Weight

The unit shall weight no more than 2.5 kilograms. This will be tested by simply weighing the final unit to assess the overall weight.

Engineering Spec 11: Volume

The volume of the unit shall not exceed 3000 cc. This will be tested by calculating the volume of the unit based on outer dimensions.

Engineering Spec 12: Time to reach peak performance

The unit shall reach predetermined peak performance within 15 minutes of the initial starting of the stove. This will be tested through trial runs cold starting the stove with the unit in place. Similar to spec 9

Engineering Spec 13: User actions during operational cycle

The unit shall require no more than 6 user interaction during the entire operational cycle. This will be tested through trials conducted with the working unit similar to spec 9 and 12.

Engineering Spec 14: User action to protect system

The unit shall not require any intervention by the user to protect the system from damage from normal operation. This will be tested through trial runs and assessing the stability of system through complete operational cycles.

Engineering Spec 15: Maximum temperature inside enclosure

The temperature inside the enclosure due to convection of ambient air and heat given off by electrical components shall not exceed 60 degrees Celsius. This will be tested through monitoring the temperature inside the enclosure during stove operation using thermocouples inserted into the chamber.

Engineering Spec 16: Maximum external temperature of housing

The external temperature of the unit shall not exceed 54 degrees Celsius. This will be tested using an infrared temperature sensor during the course of a test run to measure the external temperature of the unit.

Engineering Spec 17: Maximum temperature of the hot side of TEG

The hot side of the TEG shall not exceed 275 degrees Celsius. This will be tested through analysis as well as trial runs monitoring the temperature at the hot side of the thermoelectric to monitor for over temp. Temperatures will be assessed with thermocouples which will be inserted in a groove in the conducting apparatus and will be located between the conducting apparatus and TEG.

Overall Heat Transfer Coefficient Test | Stove Pressure Drop Test | Flow Rate Variation Test | Beam Sizing Memo | Heat Sink Sizing Memo | Additional Mechanical Considerations | Proposed Design Screenshots | Thermoelectric I-V and Power Curves | Battery Sizing | Mechanical Detailed Drawings | Electrical Schematics | Bill of Materials | Preliminary Test Plans | Detailed Design Review Documents | Detailed Design Review Action Items | Managerial Design Review Presentation