Presents: The Brumal Box

1. Presents:The Brumal Box Group Members: Alex Landry, Andrew Dobbin, Russell Fulgencio and Kirk MacDonald

2. The Brumal Box – Parts and Pieces A part-by-part analysis... • Frame • Refrigeration Unit • Inner Shell • Dispensing System • Insulation • Outer Shell

3. Frame - Prototype • The frame of the prototype is constructed from 6” steel stud tracks and 1/16” aluminum angles. Total weight is 1.729 kg.

6. Frame – Production Model • Sold by LifeSpace, the design pictured below allows for optimal circulation within the refrigerator as well as minimal weight.

7. Approximate Mass of Production Frame • Individual Wire length; .2286 m • Cross-section area; .000008 m2 • Total length required; 40 x .2286 m = 9.144 m • Density of steel; 8000 kg/m3 • Volume required; • (9.144 m)x(.000008 m2) • Volume of wire = .000073 m3 • Mass of frame = (.000073 m3)x(8000 kg/m3) • Mass = .584 kg

8. Refrigeration Unit - Prototype • The peltier device in our prototype is set to run at 72 W.

9. Refrigeration Unit – Production Model • The size of the peltier device that will be used in our production model depends upon the cooling load.

10. Inner Shell - Prototype • The inner shell is constructed of ½” pine wood.

11. Inner Shell – Production Model • A majority of modern fridges have interiors made of plastic. The plastic is a mix of ABS (Acrylonitrilebutadiene styrene), polyurethane and polypropylene.

12. Dispensing System - Prototype • The dispensing system is computer operated, using a programmable Arduino board to run a single servo motor. A modified version of Arduino’s “Sweep” code is used to control the motion of the servo. This is a C++ code.

13. #include <Servo.h> Servo dispenser1; // define the servo int pos = 0; // variable to store the servo position void setup() { dispenser1.attach(9); // attach the servo to pin 9 } void loop() { for(pos = 0; pos < 90; pos += 90) // goes from 0 degrees to 90 degrees { // in a 90 degree step dispenser1.write(pos); // tell servo to go to position in variable 'pos' delay(500); // 500 ms delay for the servo to reach the position } for(pos = 90; pos>=0; pos-=90) // goes from 90 degrees to 0 degrees { dispenser1.write(pos); // tell servo to go to position in variable 'pos' delay(500); // 500 ms delay for the servo to reach the position } }

14. Dispensing System – Production Model • A single motor can be used to scoop the available can out of the frame. In keeping with the original plan of construction a launcher, our final model will require a receiver.

15. Cooling Load W = IV W = (6A)(12V) = 72 W B = QL/W 0.8 = QL/72 QL = 57.6 W W = QH - QL QH = 14.4W

16. R Value Calculations QH = A(T2 – T1)/Rtotal; A =6.31ft2 (Surface Area) 14.4 = (6.31ft2)(77 – 73)/Rtotal Rtotal = 9.20 Rtotal= Rwood1 + Rinsulator + Rwood2 Rinsulator = 9.20 – 2x(2.5) = 4.20 R value units: ft2*Fo/W Fiberglass; R = 3.7 (In use) Polyurethane; R = 6.15 (Ideal)

17. Insulation - Prototype • The prototype uses yellow fiberglassinsulation, with an R value of roughly 3.14 – 4.10.

18. Insulation – Production Model • Polyurethane foam is the most widely used form of insulation in modern refrigerators. It is seen below being used as insulation in a house. The R-value of polyurethane foam is 6.15.

19. Outer Shell - Prototype • The outer shell is constructed of ¾ inch pine wood.

20. Outer Shell – Production Model

21. Size Comparison – Prototype VS Production • The use of wood for the inner and outer shell of the prototype adds considerable size to the Brumal Box. • The combined width of the inner and outer shell of the prototype is 1.25”, and is expected to be ¼” on the production model.