P11462: Thermoelectric and Fan System for Cook Stove

Bypass Operational Test

Bypass Operational Test

The designed bypass for the system is a simple hinged door. While this should effectively divert flow away from the combustion chamber the worry existed that the pressure drop through the outlet would be much lower than into the stove. This difference would cause a significant portion of the air to flow out of the bypass immediately when it is opened. The goal was to quantitatively measure the flow through the bypass and the combustion chamber as the bypass ratio (0% - 100%) was changed. The system was attached to the stove and charcoal was placed in the stove. Smooth ducting was attached to the bypass outlet and a rotary vane anemometer was used to measure the flow velocity. With the known area of the ducting the flow rate was determined. In order to measure the flow through the combustion chamber a garbage bag was sealed around the outlet of the combustion chamber. The bag was emptied of air before the fan was started. Once the fan was started the time to fill the bag was recorded. Using this time and the known volume of the garbage bag the volumetric flow rate was estimated. Based on the results, the flow rate through the bypass inspires confidence and appears accurate while the numbers describing flow rate through the combustion chamber do not appear accurate. (for the Excel version please see the public section of this site)

Bypass Operational Test Data

Fan Operational Test | Bypass Operational Test | Mechanical System Live Test | Boost Converter Operational Test | Battery Charger Test | Switching Circuit Test