quiz lesson 10

quiz lesson 10 - Window coa*ngs that only let through...

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Window’coa*ngs’that’only’let’through’certain’types’of’light’are’called ’Correct B’)’spectrally’selec*ve’coa*ngs’ Spectrally’selec*ve’coa*ngs’only’let’through’certain’types’of’light Which’of’the’following’is’not’a’considera*on’when’picking’a’window? ’Correct D’)’Cp’ Solar’Heat’Gain’Coefficient’(SHGC),’Visual’TransmiFance’(VT),’Air’Leakage’(AL)’are’parameters’to’be’ considered’when’picking’a’window Most’low-e’coa*ngs’__________’the’amount’of’visible’light’transmiFed’through’the’glazing’rela*ve’ to’clear’glass. ’Correct A’)’slightly’reduce’ Most’ low-e’ coa*ngs’ sligtly’ reduces’ the’ amount’ of’ visible’ light’ transmiFed’ through’ the’ glazing’ rela*ve’to’clear’glass The’________’the’Visual’TranmiFance,’the’more’light’is’transmiFed. ’Correct A’)’higher’ The’higher’the’visual’transmiFance,’the’more’light’is’transmiFed
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We’have’a’window’with’SHGC=0.6’and’VT=0.3.’What’is’the’LSG?’(3’Points) ’Correct D’)’0.5’ LSG’=’0.3’/’0.6’=’0.5 Heat’loss’and’gain’occur’by’infltra*on’through’cracks’in’the’window’assembly’by’_________ ’Correct A’)’Convec*on’ Heat’loss’because’oF’air’leaks’through’cracks’in’walls’and’windows’occurs’by’convec*on The’heat’loss’through’a’window’(U-value’=’1)’is’10’MMBTU/year.’Calculate’the’payback’period’(in’ years)’iF’ Argon’is’flled’in’the’window’to’increase’the’e±ec*ve’ U-value’oF’the’window’to’0.1429.’ Assume’hea*ng’price’to’be’$10/MMBTU’and’the’cost’For’flling’Argon’is’$20. ’Correct B’)’0.23’years’ R-value’oF’new’window’=’1/0.1429’=’7’Heat’lost’through’new’window’per’year’=’(10’x’1)’/’7’=’1.42’ MMBTUs/yr Reduc*on’in’heat’lost’per’year’=’10’-’1.42’=’8.58’MMBTUs/yr Savings’in’energy’cost’per’year’=’8.58’x’10’=’$85.8 Payback’period’=’20’/’85.8’=’0.23’yrs The’Frac*on’oF’inFrared’radia*on’admi²ed’by’a’window’is’characterized’by
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’Correct A’)’SHGC’ The’frac*on’of’infrared’radia*on’admiFed’by’a’window’is’characterized’by’solar’heat’gai’coefficient Air’space’between’the’window’panes’does’have’an’e±ect’on’window’R-values. ’Correct A’)’TRUE’ Air’space’between’the’window’panes’helps’reduce’heat’loss’by’cu²ng’condu*ve’heat’loss.
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quiz lesson 10 - Window coa*ngs that only let through...

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