7. A 6 in. x 20 ft uninsulated pipe schedule 80 conveys steam at 385°F with an average ambient temperature of 85°F. If the cost of the fuel is Php. 240.00 per 10 Btu with the net energy conversion efficiency of 78%, what is the annual cost of the heat lost?

7. A 6 in. x 20 ft uninsulated pipe schedule 80 conveys steam at 385°F with an average ambient temperature of 85°F. If the cost of the fuel is Php. 240.00 per 10 Btu with the net energy conversion efficiency of 78%, what is the annual cost of the heat lost?

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter9: Heat Transfer With Phase Change

Section: Chapter Questions

Problem 9.27P

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Question

7. A 6 in. x 20 ft uninsulated pipe schedule 80 conveys steam at 385°F with an average ambient temperature
of 85°F. If the cost of the fuel is Php. 240.00 per 106 Btu with the net energy conversion efficiency of 78%,
what is the annual cost of the heat lost?
Note:
For 6" pipe scheduled 80: Do = 6.625 in.; Di = 5.761 in.
For iron: k = 30 Btu/hr-ft-°F
For the surface coefficients: hi = 1000 Btu/hr-ft²-°F; ho = 2 Btu/hr-ft²-°F

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