Transcript Windshield Deicer

BE1100 Design Project
Getting Rid of the Ice…
Ryan Bedford
Eric Gonzalez
Meghan Vohs
Jason Harris
Identification of a Need
• PROBLEM: Inconvenience for drivers
in below freezing temperatures
• NEED: An automatic device that will
clear the windshield of frost and ice
Problem Definition
• Designing a mechanism that will
eliminate solid precipitation on
windshield
• We want the device to be automatic to
reduce driver inconvenience
Search
• Triplex Safety Glass Co. has developed a
windshield film called Hyviz
• Visteon/Southwall collaborate to design a
windshield film called XIR
• Nano-tubes
• Rear window defrosters
• Ice scrapper
• Garage
• Solar cells and batteries
• Temperature Sensors
Constraints
•
•
•
•
Visibility
Size
Battery - must fit in original car design
Safety – must be able to crumble with
glass
Criteria
•
•
•
•
Cost of production verse profit
Types of materials used
Appearance of exterior parts
Automatic Device
Alternate Solutions
•
•
•
•
Ice Scraper
Garage
Powered by car battery
Solar Powered Device (Using either
conductive film or nano-tubes)
Analysis – Ice Scraper
PROS:
Save $$
CONS:
Loss of time
Expenditure of personal
Energy
Out in the cold
BUDGET
$6 - 10
Analysis - Garage
PROS:
No frost/snow
Saves time
BUDGET
$5,000+
CONS:
Expensive to construct
Not everyone has a garage
May not be room for all
needed cars
Analysis – Car Battery Powered Device
PROS:
Lower cost
CONS:
May drain the battery
Saves time
EST. BUDGET
HIGH
LOW
CAR BATTERY
$80 (12V)
$40 (12V)
TEMP SENSOR
$150
$40
NANO-TUBES
$1,000 (2mm long)
????
XIR OR HYVIZ
FILM
????
????
Analysis – Solar Powered Device
PROS:
Decreases fuel emissions
Saves gas
Saves time
CONS:
Cost
EST. BUDGET
HIGH
LOW
SOLAR BATTERY
$75 (12V)
$13.95 (12V)
SOLAR CELLS
$55 (12”x8.75”)
$45 (11”x8.75”)
TEMP SENSOR
$150
$40
NANO-TUBES
$1,000 (2mm long)
????
XIR OR HYVIZ
FILM
????
????
Specifications - Solar Power Design
Interior
Exterior
XIR or Hyviz Film
Electrical Cables (Interior)
Temperature
Sensor
Electrical
Source
Solar
Cells
Hyviz Data
Want a film with a resistance of .52 ohm/square
W=v^2/r
– W=total power in watts
– V=supply voltage
– r=resistance load in in ohms
W=V^2/r(sq)d^2
– d=depth of windshield between busbars
– r(sq)=ohms/square area
– W=power density in watts/in^2
– V=supply voltage
Graph of defrosting times at 0 ºF
1.2
Watts/in^2
1
0.8
XY (Scatter) 1
0.6
Power (XY (Scatter)
1)
0.4
0.2
0
0
10
20
time in minutes
30
Specifications of Hyviz Film
Film thickness is around 3000 Angstroms
With this thickness there is around 80% transmission of visible
light through the windshield.
Any power density over .5 W/in^2 needs a temperature sensor
to avoid overheating and to conserve power
Decision
• To satisfy the Constraints & Criteria
as best as possible while considering
the Identification of the Need, we will
choose the Solar Powered Device
– Automatic system
– Saves time
– Fits all existing vehicle qualities
– Not an unrealistic production cost
Communication
• Commercials
• Promote in higher priced cars (BMW,
Mercedes, Bentley and Cadillac)
• Promote in colder climate areas
• Introduce at Auto Shows
THE END