Water flow in steel pipe at a temperature of 50o C as shown in the figure. The pipe is wrapped with thermal isolation. Air is flowing over the pipe at a temperature of -5o C and a speed of 3 m/sec. It is known that 1kWh costs 0.05$ Find the daily cost of the heat losses per meter without the pipe isolation? What is the daily cost saving when using the isolation?

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Water flow in steel pipe at a temperature of 50o C as shown in the figure. The pipe is wrapped with thermal isolation. Air is flowing over the pipe at a temperature of -5o C and a speed of 3 m/sec. It is known that 1kWh costs 0.05$

Find the daily cost of the heat losses per meter without the pipe isolation? What is the daily cost saving when using the isolation?

Insulation
Air
ki = 0.026 W/m-K
Steel pipe
Di = 84 mm
Do = 100 mm
kp = 60 W/m-K
Water
Tm = -5°C
V = 3 mis
T 50°C
Figure 1
Transcribed Image Text:Insulation Air ki = 0.026 W/m-K Steel pipe Di = 84 mm Do = 100 mm kp = 60 W/m-K Water Tm = -5°C V = 3 mis T 50°C Figure 1
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