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Quiz 10

# Quiz 10 - Quiz 10 Typically windows have an R-value the...

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Quiz 10 Typically, windows have an R-value ________ the wall. Answer: Lower than Most low-e coatings __________ the amount of visible light transmitted through the glazing relative to clear glass. Answer: Slightly reduce ______________ measures how well a window blocks heat from the sunlight Answer: Solar Heat Gain Coefficient (SHGC) The __________ the U-Factor the less heat the window allows to pass through. Answer: Smaller We have a window with SHGC=0.25 and VT=0.62. What is the LSG? (3 Points) Answer: 2.48. LSG= 0.62/0.25 = 2.48 The heat loss through a window (U-value = 0.5) is 10 MMBTU/year. Calculate the payback period (in years) if Argon is filled in the window to increase the effective U-value of the window to 0.100. Assume heating price to be \$10/MMBTU and the cost for filling Argon is \$20. Answer: R-value of new window = 1/0.100 = 10 Heat lost through new window per year = (10 x 2) / 10 = 2 MMBTUs/yr Reduction in heat lost per year = 10 - 2 = 8 MMBTUs/yr Savings in energy cost per year = 8 x 10 = \$80 Payback period = 20 / 80 = 0.25 yrs _______ gas is used in gas filled windows to improve thermal performance Answer: Krypton Inert gas fills between two window panes reduces

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Quiz 10 - Quiz 10 Typically windows have an R-value the...

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