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 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; m
Cross-section area; m2
Total length required; 40 x m = m
Density of steel; 8000 kg/m3
Volume required;
(9.144 m)x( m2)
Volume of wire = m3
Mass of frame = ( 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 (Acrylonitrile butadiene 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

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
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 fiberglass insulation, with an R value of roughly 3.14 –

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.