Question

A 2.5 cm inside diameter pipe is being used to convey a liquid food at 80ºC. The inside convective heat transfer coefficient is 10W/(m2ºC). The pipe (0.5 cm thick) is made of steel (thermal conductivity = 43W/mºC). The outside ambient temperature is 20ºC. The outside convective heat-transfer coefficient is 100 /(m2ºC). Calculate the overall heat transfer coefficient and the heat loss from 1 m length of the pipe.

Answer #1

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.

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.

A pipe is transporting saturated steam at 1 bar (100°C)
. The pipe has an inside diameter of 100 mm with a 9 mm thick wall.
The pipe is mild steel with a thermal conductivity of 80 W m-1 K-1.
Covering the pipe is a 20 mm thick layer of polythene insulation
with a thermal conductivity of 0.04 W m-1 K-1. The convective heat
transfer coefficient of the steam is 513.4 W m-2 K-1. The
convective heat transfer coefficient of...

Liquid, pumped through the inside of the pipe, is at a
temperature Ti = 400K and provides a convection
coefficient hi = 450 W/m2-K at the inner
surface of the pipe. The inside and outside radii of the pipe are
r1 = 0.25 m, r2 = 0.31 m. The thermal conductivity of the pipe is
240 W/m-K. The outside radius of the insulation, r3 = 0.35 m. The
thermal conductivity of the insulation is 20 W/m-K. The outside
surface is...

Uniform area, heat transfer problem A stove's walls are made up
of a flat inner insulating board 0.01m thick (thermal conductivity:
0.2 W m-1K-1) and a flat outer steel sheet
0.01m thick (thermal conductivity: 26 W
m-1K-1). A mineral-wool (thermal
conductivity: 0.065 W m-1K-1) is placed
between these sheets. The inside temperature of the wall is 773K,
how thick does the insulation have to be to maintain the outside
wall temperature at 323K ? Assume that the ambient air temperature...

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...

hot fluid at 230°C flows through a 1-meter pipe of 0.02m outside
radius and 0.015m inside radius. The thermal conductivity of the
pipe is 0.5 W/m.k, and the heat transfer coefficient (hi) inside is
300 W/m2 K. The pipe is located in a room at 30°C, and the heat
transfer coefficient (ho) at the outer surface is 10 W/m2 k.
Calculate the temperature drop (∆T) across the pipe wall.

Liquid water flows in a long pipe of internal diameter of
D = 0.01 m at a mean velocity of V = 0.065 m/s.
The pipe is maintained at a constant and uniform surface
temperature. Assume the flow is both hydrodynamically and thermally
fully developed. For simplicity, evaluate the properties of water
at 300 K.
Calculate the convective heat transfer coefficient of the flow
inside the pipe in W/m2K?

Develop the heat transfer rate across the metalic wall of pipe that
has inside raduis of ri and temperature Ti , outside radius ro and
To with length L and average thermal conductivity k

An aluminum fin 1.6 mm thick surrounds a tube 2.5 cm
in diameter. The length
of the fin is 12.5 mm. The tube-wall temperature is 200◦C, and the
environment
temperature is 20◦C. The heat-transfer coefficient is 60 W/m2 · ◦C.
Consider the heat dissipated in a pipe 1.20 m long if the fins are
4.2 mm apart from center to center
Explain your procedure with formulas

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