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->∞)= 0.5084  Because of lack of equipment we couldn’t measure any of the other regions

7. Results

8. Results

9. Calculations  Tinting reduced visible radiation about 60%  Even if tinting doesn’t 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