Tinted Windows

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    10-Feb-2016
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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. - PowerPoint PPT Presentation

Transcript of Tinted Windows

  • Tinted WindowsByMark Thompson, Owen Carlson, Spencer Smith

  • IntroductionTinted windows reduce solar radiation that damages car interiorsTint also keeps cars cool during summer and winter monthsTint reduces glare while driving

  • ProblemCalculate the heat flux reduction through tinted windows.

  • Conduction Vs. RadiationTinting 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 windowsReflecting radiation from the sun is what tinting does.

  • Equipment & Calculations

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

  • Results

    Chart1

    70287060

    70327064

    5287050

    22.627416998222.62741699815

    Light Outside of Tint

    Light Inside of Tint

    Light Outside w/o Tint

    Light Inside w/o Tint

    Time

    Light (foot candles)

    Incident Light

    Sheet1

    (celcius)(celcius)(foot candles)(foot candles)(celcius)(foot candles)(foot candles)

    TimeTemperature OutsideTemp. with TintIndescent Light OutIndescent Light OutTemp w/o TintIndescent Light OutIndescent Light Out

    11:15 AM-34.87028117060

    12:15 PM-27.77032177064

    1:50 PM0.6752817.37050

    2:45 PM2.57.122.627416998214.522.62741699815

    Sheet1

    Light Outside of Tint

    Light Inside of Tint

    Light Outside w/o Tint

    Light Inside w/o Tint

    Time

    Light (foot candles)

    Incident Light

    Sheet2

    Temp Outside

    Temp Inside Tint

    Temp Inside No Tint

    Time

    Temperature (C)

    Temperature Variations

    Sheet3

  • Results

    Chart2

    -34.811

    -27.717

    0.6717.3

    2.57.114.5

    Temp Outside

    Temp Inside Tint

    Temp Inside No Tint

    Time

    Temperature (C)

    Temperature Variations

    Sheet1

    (celcius)(celcius)(foot candles)(foot candles)(celcius)(foot candles)(foot candles)

    TimeTemperature OutsideTemp. with TintIndescent Light OutIndescent Light OutTemp w/o TintIndescent Light OutIndescent Light Out

    11:15 AM-34.87028117060

    12:15 PM-27.77032177064

    1:50 PM0.6752817.37050

    2:45 PM2.57.122.627416998214.522.62741699815

    Sheet1

    Light Outside of Tint

    Light Inside of Tint

    Light Outside w/o Tint

    Light Inside w/o Tint

    Time

    Light (foot candles)

    Indescent Light

    Sheet2

    Temp Outside

    Temp Inside Tint

    Temp Inside No Tint

    Time

    Temperature (C)

    Temperature Variations

    Sheet3

  • CalculationsTinting reduced visible radiation about 60%Even if tinting doesnt block radiation in any other regions it still accounts for about: .6 x .3676 = .22 or22% of total incident solar radiationMost likely tinting also reduces radiation in other regions that would help reduce temperature and damage caused by solar radiation.

  • ConclusionTinting reduced the amount of visible light in the carIt also reduced the temperature in the carTinting can protect car interiors from harmful light