Thermodynamics HW Solutions 614

Thermodynamics HW Solutions 614 - 12,157 0 0 1 cm 15,021...

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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 133,600
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Unformatted text preview: 12,157 0 0 1 cm 15,021 1367 10,790 2828 5 cm 3301 300 11,850 3535 10 cm 1671 152 12,005 9189 11 cm 1521 138 12,019 9897 12 cm 1396 127 12,030 10,604 13 cm 1289 117 12,040 11,310 14 cm 1198 109 12,048 12,017 15 cm 1119 102 12,055 12,724 Therefore, the thickest insulation that will pay for itself in one year is the one whose thickness is 14 cm . 7-69...
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