Tinted Windows

1
Tinted Windows

• By
• Mark Thompson, Owen Carlson, Spencer Smith

2
Introduction

• Tinted windows reduce solar radiation that
  damages car interiors
• Tint also keeps cars cool during summer and
  winter months
• Tint reduces glare while driving

3
Problem

• Calculate the heat flux reduction through tinted
  windows.

4
Conduction Vs. Radiation

• Tinting is so thin that it is negligible in
  reducing heat transfer into the car through the
  windows.
• Combination of convection and conduction through
  the rest of the car is important but has nothing
  to do with tinted windows
• Reflecting radiation from the sun is what tinting
  does.

5
Equipment Calculations
6
Radiation Measurement

• A large part of the radiation is in the visible
  region.
• F( 0-.4) 0.1240
• F(.4-.7) 0.3676 (visible)
• F(.7-8) 0.5084
• Because of lack of equipment we couldnt measure
  any of the other regions

7
Results
8
Results
9
Calculations

• Tinting reduced visible radiation about 60
• Even if tinting doesnt block radiation in any
  other regions it still accounts for about
• .6 x .3676 .22 or
• 22 of total incident solar radiation
• Most likely tinting also reduces radiation in
  other regions that would help reduce temperature
  and damage caused by solar radiation.

10
Conclusion

• Tinting reduced the amount of visible light in
  the car
• It also reduced the temperature in the car
• Tinting can protect car interiors from harmful
  light