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3. A 50-m-long section of a steam pipe whose outer diameter is 10 cm passes through an open space at 15°C. The average t
Posted: Fri Jul 01, 2022 6:51 am
by answerhappygod
- 3 A 50 M Long Section Of A Steam Pipe Whose Outer Diameter Is 10 Cm Passes Through An Open Space At 15 C The Average T 1 (51.34 KiB) Viewed 121 times
- 3 A 50 M Long Section Of A Steam Pipe Whose Outer Diameter Is 10 Cm Passes Through An Open Space At 15 C The Average T 2 (43.58 KiB) Viewed 121 times
3. A 50-m-long section of a steam pipe whose outer diameter is 10 cm passes through an open space at 15°C. The average temperature of the outer surface of the pipe is measured to be 150°C. If the combined heat transfer coefficient on the outer surface of the pipe is 20 W/m² °C, determine (a) the rate of heat loss from the steam pipe; (b) the annual cost of this energy lost if steam is generated in a natural gas furnace that has an efficiency of 75 percent and the price of natural gas is $0.52/therm (1 therm= 105,500 kJ); and (c) the thickness of fiberglass insulation (k = 0.035 W/m °C) needed in order to save 90 percent of the heat lost. Assume the pipe temperature to remain constant at 150°C.
150°C Tir=15°C Steam Fiberglass insulation 50 m