A copper tube (k-75 W/m*K) with inner radius r;-2 cm and outer radius r2-2.05 cm is used to transport a low-temperature refrigerant having anmean temperature T-350 K and convection coefficient h=50 W/m2*K. The tube is covered with insulation having inner radius r,-2.05 cm andouter radius r-4.6 cm. The conductivity of the insulation is k=0.05 W/m*K. The air on the outside of the insulation at T=400 K creates anverage convection coefficient of h,=16 W/m2*K.Ta. Sketch the equivalent thermal circuit of the system and express all resistances in terms of relevant variables. Assume that T; and To areuniform along the length of the pipe.b. Use a thermal circuit to write an expression for the rate of heat transfer for a length of pipe L=4 meters in terms of the variables defined above.

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copper tube (k-75 W/m*K) with inner radius r;-2 cm and outer radius r22.05 cm is used to transport a low-temperature refrigerant having an an temperature T-350 K and convection coefficient h-50 W/m2 K. The tube is covered with insulation having inner radius r, 2.05 cm and ter radius r-4.6 cm. The conductivity of the insulation is k=0.05 W/m*K. The air on the outside of the insulation at T-400 K creates an erage convection coefficient of h,-16 W/m2 K. emal w Ane T Sketch the equivalent thermal circuit of the system and express all resistances in terms of relevant variables. Assume that T and To are hiform along the length of the pipe. Use a thermal circuit to write an expression for the rate of heat transfer for a length of pipe L-4 meters in terms of the variables defined above.

copper tube (k-75 W/mK) with inner radius r;-2 cm and outer radius r22.05 cm is used to transport a low-temperature refrigerant having an an temperature T-350 K and convection coefficient h-50 W/m2 K. The tube is covered with insulation having inner radius r, 2.05 cm and ter radius r-4.6 cm. The conductivity of the insulation is k=0.05 W/mK. The air on the outside of the insulation at T-400 K creates an erage convection coefficient of h,-16 W/m2 K. emal w Ane T Sketch the equivalent thermal circuit of the system and express all resistances in terms of relevant variables. Assume that T and To are hiform along the length of the pipe. Use a thermal circuit to write an expression for the rate of heat transfer for a length of pipe L-4 meters in terms of the variables defined above.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

A copper tube (k-75 W/m*K) with inner radius r;-2 cm and outer radius r2-2.05 cm is used to transport a low-temperature refrigerant having an
mean temperature T-350 K and convection coefficient h=50 W/m2*K. The tube is covered with insulation having inner radius r,-2.05 cm and
outer radius r-4.6 cm. The conductivity of the insulation is k=0.05 W/m*K. The air on the outside of the insulation at T=400 K creates an
verage convection coefficient of h,=16 W/m2*K.
T
a. Sketch the equivalent thermal circuit of the system and express all resistances in terms of relevant variables. Assume that T; and To are
uniform along the length of the pipe.
b. Use a thermal circuit to write an expression for the rate of heat transfer for a length of pipe L=4 meters in terms of the variables defined above.

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