Question

Insulation is added in 3 cm layers over a steel pipe of 30 cm
dia. The convection on the outside

is 25 W/m2K. The conductivity of the material is 0.47 W/mK.
Determine the total thermal

resistance for the addition of 5 such layers. Compare the %
increase in resistance and %

increase in the volume of material over the first layer.

Answer #1

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A stainless steel pipe [thermal conductivity = 17 W/(m.C)] is
being used to convey heated oil. The inside surface temperature is
13 degrees C. The pipe is 2 cm thick with an inside diameter of 8
cm. The pipe is insulated with 0.04m thick insulation [thermal
conductivity = 0.035 W/(m.C)]. The outer insulation temperature is
25 degrees C. Calculate the temperature of the interface between
steel and insulation, assume steady-state conditions.

Steam at an average temperature of ?∞= 400°C flows through a
steel pipe. The inner and outer radii of the pipe are r1 = 4 cm and
r2 = 4.5 cm, respectively, and the outer surface of the pipe is
insulated with a layer of 50 mm thick-calcium silicate of thermal
conductivity of k = 0.5 W/m.K, and is maintained at 350 °C. If the
convection heat transfer coefficient on the inner surface of the
pipe is h = 65...

Steam at 350°F flows through a 3-in (ID) copper pipe having a
thickness of 0.22 in. The outside surface of the pipe is insulated
with 1-in-thick layer of fiberglass and 0.008-in-thick layer of
aluminum. The outside surface of the insulation is exposed to air
at 130°F. The convection coefficients for steam and air are 25 and
12 Btu/h-ft2 -°F, respectively. The thermal conductivity of
fiberglass is 0.022 Btu/h-ft-°F.
a. Calculate the rate of heat transfer for 30-ft length of the...

A 2 cm thick steel pipe (thermal conductivity = 43 W/[m.C]) with
6 cm inside diameter is being used to convey steam from a boiler to
process equipment for a distance of 40 m. The inside pipe surface
temperature is 115 degrees C, and the outside pipe surface
temperature is 90 degrees C. Calculate the total heat loss to the
surroundings under steady-state conditions.

Question 2
(a) A steel pipe of length L =150 cm outside diameter d2 =
15cm, and inside diameter d1 = 11cm is compressed by an
axial force P = 600kN. The material has modulus of elasticity
E = 210GPa and Poisson's ratio V = 0.30.
Determine the following quantities for the pipe:
(i) The increase Δv in the volume of material, and
(ii) The dilatation (e).

Homework-9
Due:
Q) A fuel plate is fabricated from 0.3 cm thick 1.5% enriched
uranium. The cladding is 0.25 mm 304 stainless steel. The coolant
saturation temperature is 260 oC. The
average thermal neutron flux is 2.5 X
1014
neutrons/cm2 /s. The surface
temperature of the clad is 350 oC.
Assume any missing data to answer the following questions:.
1) Write an expression of the heat generated per unit volume
2 What is the heat flux at the surface of...

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