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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