Thermodynamics HW Solutions 616

Thermodynamics HW Solutions 616 - 0 0 1 cm 11,445 1041 8222...

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Chapter 7 External Forced Convection To determine the thickness of insulation whose cost is equal to annual energy savings, we repeat the calculations above for 2, 3, . . . . 15 cm thick insulations, and list the results in the table below. Insulation Thickness Rate of heat loss W Cost of heat lost $/yr Cost savings $/yr Insulation cost $ 0 cm 101,794 9263
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Unformatted text preview: 0 0 1 cm 11,445 1041 8222 2828 5 cm 2515 228 9035 3535 9 cm 1413 129 9134 8483 10 cm 1273 116 9147 9189 11 cm 1159 105 9158 9897 12 cm 1064 97 9166 10,604 Therefore, the thickest insulation that will pay for itself in one year is the one whose thickness is 9 cm . The 10-cm thick insulation will come very close to paying for itself in one year. 7-71...
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