quiz lesson 10

# Per year 8 x 10 80 payback period

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Unformatted text preview: heat it transmits A window with a solar heat gain coeﬃcient of 0.8 transmits less solar heat compare to a window with a solar heat gain coeﬃcient of 0.5 Correct B ) FALSE Solar Heat Gain Coeﬃcient is expressed as a number between 0 and 1. The lower a window's SHGC, the less solar heat it transmits In winter *me when the drapes are opened for energy eﬃciency, the most important type of radia*on that is allowed is Correct B ) I R radia*on In windter, drapes are lei open to get heat from the sun. This heat enters the house as Infra- Red radi*on Light- to- Solar Gain (LSG) = Correct A ) Visual TransmiFance / Solar Heat Gain Coeﬃcient LSG = V T / S HGC _______ gas is used in gas ﬁlled windows to improve thermal performance Correct A ) Argon Argon and Krypton are inert gases that are used in gas ﬁlled windows to improve thermal performance We have a window with S HGC=0.61 and V T=0.67. What is the L SG? (3 Points) Correct A ) 1.1 LSG = 0.67 / 0.61 = 1.098 Low- e coa*ngs reduce ________ transfer by 5 to 10 *mes Correct A ) I R heat Low- e coa*ngs reduce I R heat transfer by 5 to 10 *mes We have a window with S HGC=0.25 and V T=0.62. What is the L SG? (3 Points) Correct A ) 2.48 LSG = 0.62 / 0.25 = 2.48 We have a window with S HGC=0.29 and V T=0.44. What is the L SG? (3 Points) Correct D ) 1.52 LSG = 0.44 / 0.29 = 1.517 These coa*ngs on windows come in soi and hard coats. Correct C ) low- e glazings low e- glazings come in soi and hard coats Energy eﬃcient windows have ______ R- values compared to regular windows Correct A ) Higher Energy eﬃcient windows have higher R- values compared to regular windows Visual TransmiFance (VT) is expressed as number between 0 and __________ Correct A ) 1 Visual TrasmiFance is expressed as a number between 0 and 1 The _________ the C R ra*ng, the beFer that product is at resis*ng condensa*on forma*on Correct A ) Higher The higher the C R ra*ng, the beFer that product is at resis*ng condensa*on forma*on Windows _________ more heat per square foot of area in winter and _____ more heat in summer than any other surface in the home. Correct A ) Loose, Gain Windows loose more heat per square foot of area...
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## This note was uploaded on 09/24/2013 for the course EGEE 102 taught by Professor Pisupati,sarmave during the Spring '07 term at Penn State.

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