Thermodynamics HW Solutions 174

Thermodynamics HW Solutions 174 - 600 4372 pane double pane...

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Chapter 3 Steady Heat Conduction 4th wall with double pane windows: R i R wall R o R glass R air R glass C/W 023336 . 0 000833 . 0 020717 . 0 001786 . 0 C/W 020717 . 0 27303 . 0 1 5 033382 . 0 1 1 5 1 1 C/W 27303 . 0 267094 . 0 002968 . 0 2 2 C/W 267094 . 0 m ) 8 . 1 2 . 1 )( C . W/m 026 . 0 ( m 015 . 0 C/W 002968 . 0 m ) 8 . 1 2 . 1 )( C . W/m 78 . 0 ( m 005 . 0 C/W 033382 . 0 m ) 8 . 1 2 . 1 ( 5 ) 4 20 ( C/W m 31 . 2 eqv total eqv window wall eqv air glass window 2 o 2 air air 2 2 glass glass 2 2 wall wall ° = + + = + + = ° = ⎯→ + = + = ° = + × = + = ° = × = = ° = × ° = = ° = × × ° = = = o i R R R R R R R R R R R kA L R kA L R A value R kA L R Then W 600 = ° ° = = C/W 023336 . 0 C ) 8 22 ( total 2 1 R T T Q The rate of heat transfer which will be saved if the single pane windows are converted to double pane windows is W 3772
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Unformatted text preview: 600 4372 pane double pane single save = = = Q Q Q & & & The amount of energy and money saved during a 7-month long heating season by switching from single pane to double pane windows become kWh 19,011 = h) 24 30 kW)(7 772 . 3 ( = = t Q Q save save & Money savings = (Energy saved)(Unit cost of energy) = (19,011 kWh)($0.08/kWh) = $1521 3-17...
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This note was uploaded on 01/14/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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