Question

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.

Answer #1

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 2.5 cm inside diameter pipe is being used to convey a liquid
food at 80ºC. The inside convective heat transfer coefficient is
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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.

consider a 0.8 cm thick steel plate with a thermal
conductivity of 50W/m-k.When the inside surface of the plate is
subjected to a uniform heat flux 0f 5*104 w/m2 the oter surface
temperature of the plate is measured to be 110c under steady
operating condition
a)express the differential equation and the boundary
conditions for steady one dimensional heat conduction through the
wall
b)obtain the relation for the variation of temperature
in the plate by solving the differential equation.
c)evaluate the...

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...

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...

A large steam pipe is covered with 1.5-cm-thick insulating
material of thermal conductivity 0.27 J/(s m °C). How much energy
is lost every second when the steam is at 205 °C and the outside of
the pipe has a temperature of 20°C? The pipe has a circumference of
7.5 m and a length of 80 m. Neglect losses through the ends of the
pipe. What is the units as well?

A steam pipe is covered with 1.50 cm thick insulating material
with a thermal conductivity of 0.200 cal/cm·°C·s. How much energy
is lost every second when the steam is at 250°C and the surrounding
air is at 20.0°C? The pipe has a circumference of 800 cm and a
length of 65.0 m. Neglect losses through the ends of the pipe.

A steel hot-water tank of cylindrical shape has an inside
diameter of 0.600 m and inside height of 1.40 m. The tank is
enclosed by a 5.00 cm thick insulating layer of glass wool whose
thermal conductivity is 0.0350 W / (m·K). The insulation is covered
by a thin sheet metal skin. The steel tank and the sheet metal skin
have thermal conductivities that are much greater than that of the
glass wool. How much electrical power (W) must be...

Calculate the rate of heat conduction (in W) through house walls
that are 14.5 cm thick and that have an average thermal
conductivity twice that of glass wool. Assume there are no windows
or doors. The surface area of the walls is 145 m2 and
their inside surface is at 21.5°C, while their outside surface is
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How many 1 kW room heaters would be needed to balance the heat
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A thin-walled metal pipe of diameter 7.50 cm and length 6.20 m
is used to transport 20.0 grams of st eam at 100 O C every second.
The pipe is surrounded by insulation with k = 0.0400 W/m-K. How
thick must the insulation be if only 0.500% of the steam is allowe
d to condense inside the pipe when the external temperature (i.e.
outside the pipe) is 20.0 O C?
answer is 2.76 cm

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