Tinted Windows By Mark Thompson, Owen Carlson, Spencer Smith

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

Problem  Calculate the heat flux reduction through tinted windows.

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.

Equipment & Calculations

Radiation Measurement  A large part of the radiation is in the visible region.  F( 0->.4)=  F(.4->.7)= (visible)  F(.7->∞)=  Because of lack of equipment we couldn’t measure any of the other regions

Results

Results

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.

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