Senior Design Iterations

The following are design iterations on the housing used for my senior design project. More information on my senior design project, and the thermoelectric modules used, can be found in the "Senior Design" section.

The housing holds thermometric modules, which are pieces of flat ceramic that, when attached to a battery, have a very hot side and a very cold side. A fan connected at the back of the housing pulls in air through a filter and then runs the air over the cold side of the thermometric module. The chilled air is sent to the mask through the circular opening at the front.

Version 1

Our proof-of concept design. This held room for two modules on opposite sides of the housing (the square opening), and connected to a tube that run up to the mask.

Version 2

The housing was made bigger to accommodate a larger fan, and to make room for four modules placed around the perimeter of the housing.

Version 3

This design implemented a barrier to protect the user's fingers from the hot side of the thermoelectric modules. However, the 3D printed barrier warped due to the high heat coming from the modules.

Version 4

The barrier was removed, replaced with laser cut acrylic that would not warp. We also slightly offset the fan mount from the chamber. Air brought in by the fan not only would be cooled and sent to the mask, but also was used to apply forced convection over the hotter side of the TEC, cooling it slightly.

Version 5 (Final)

This final version added rounds to strengthen where the fan mount met the housing, improved the interior geometry to promote good airflow, and increased the size of the circular opening to accommodate a larger hose.

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