ASPEN KNOX

Project Overview.

The preliminary concept features a 12×12 mini-fridge that runs on a reversed Brayton cycle using air as the working fluid. The design utilizes a 1 cm centrifugal compressor, a heat exchanger, a turbo pump, and a fan to cool the refrigerated space.

The design was chosen above other options (solar, ice, and thermoelectric concepts) because of its low environmental impact, minimal setup needs, and potential for quick heat extraction. Despite possible production challenges, it provided a new refrigeration solution and scored highest in Pugh’s Matrix when compared to the Vapor-Compression Mini Fridge as a datum. 

Requirements.

1. Shall be capable of accommodating cylindrical beverage containers up to 3 inches in diameter and 8 inches in length.
2. Shall be compatible with beverage containers constructed from plastic, metal, or glass material
3. May be able to accommodate active cooling for up to 2 beverage containers simultaneously.
4. Shall be capable of reducing the average temperature of the beverage from a maximum initial temperature of 80 degrees Fahrenheit to 36 degrees Fahrenheit within 7 minutes of operation.
5. Must not reduce the beverage’s average temperature below 30 degrees Fahrenheit.
6. Shall not require a supply of any chemicals or materials to operate that are not commonly found in ordinary kitchen settings.
7. Must have an overall size no greater than an 18-inch cube.
8. Should have set up time prior to operation of less than 5 minutes.
9. Should cost less than $300 in 2022 dollars to manufacture.