The interior of a refrigerator has a surface area of 4.7 m2 . It is insulated...
The interior of a refrigerator has a surface area of 4.7 m2 . It is insulated by a 2.9 cm thick material that has a thermal conductivity of 0.024 J/m · s · ◦ C. The ratio of the heat extracted from the interior to the work done by the motor is 6.7% of the theoretical maximum. The temperature of the room is 20.1 ◦C, and the temperature inside the refrigerator is 9.1 ◦C. Determine the power required to run the compressor. Answer in units of W.
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The interior of a refrigerator has a surface area of 4.7 m2 . It
is insulated...
A) A steam engine (assume a Carnot engine ) has an efficiency of 62.9%. If the...
A) A steam engine (assume a Carnot engine ) has an efficiency of 62.9%. If the waste heat has a temperature of 13.5◦C, what is the temperature of the boiler? Answer in units of ◦C. B) The interior of a refrigerator has a surface area of 2.4 m2. It is insulated by a 3 cm thick material that has a thermal conductivity of 0.0222 J/m · s ·◦ C. The ratio of the heat ex- tracted from the interior to...
A particular insulating container has a total surface area of 1.50 m2 and walls that are...
A particular insulating container has a total surface area of 1.50 m2 and walls that are 4.00 cm thick. Suppose that a 10.0 W electric heater keeps the inside of the container 10.0°C warmer than the temperature outside. What is the thermal conductivity k of the material that the container is made of? (Enter your answer in W/(m · °C).)
You place your lunch leftovers in the refrigerator. Suppose the refrigerator needs to remove 9.8700E+3 J...
You place your lunch leftovers in the refrigerator. Suppose the refrigerator needs to remove 9.8700E+3 J of thermal energy from your lunch to cool it to the temperature of the inside of the refrigerator. In the meantime, this means the refrigerator produces 1.3702E+4 J of thermal energy that it expels into the kitchen as a result. What is the total work done by the compressor motor in the refrigerator?(Ignore any thermal loses due to friction in the motor.) 3.832×103 J...
A concrete wall of a house is 45 cm thick and has a surface area 20m...
A concrete wall of a house is 45 cm thick and has a surface area 20m x 5 m. The inside temperature of the wall is 47 °C and the outside air temperature is 14 °C. Thermal conductivity of the concrete wall is 0.8 W/mK. Calculate the heat transfer rate through the wall by conduction and its thermal resistance.
Heat Transfer -A wall 20 cm thick is to be constructed from material that has an...
Heat Transfer
-A wall 20 cm thick is to be constructed from material that has an average thermal conductivity of 2 W/m C. The wall is to be insulated with 5cm material having an average thermal conductivity of 0.5W/m C. Assuming that the inner and outer surface temperatures of the insulated wall are 200 and 20°C, calculate the heat transfer per unit area and the intermediate Temperature between the insulation and the wall.
A steam main of 150 mm outside diameter containing wet steam at 28 bar is insulated...
A steam main of 150 mm outside diameter containing wet steam at 28 bar is insulated with an inner layer of diatomaceous earth, 40 mm thick, and an outer layer of 85 % magnesia, 25 mm thick. The inside surface of the pipe is at the steam temperature, and the heat transfer coefficient for the outside surface of the lagging is 17 W/m2 K. The thermal conductivities of diatomaceous earth and 85 % magnesia are 0.09, and 0.06 40 ME...
A refrigerator has a surface area of 5m2, and the internal and external temperatures are 40C...
A refrigerator has a surface area of 5m2, and the internal and external temperatures are 40C and 250C respectively. The heat gain through the insulation layer should be 60W maximum. The material for the insulation layer must be chosen from the candidates below. Which of the materials is not appropriate? From the remaining materials, determine the most cost effective. Material Yield stress (MPa) Thermal Conductivity (W / m K) Conductivity (Ohm m) Density (kg / m3) Cost (/kg) Appropriate (Yes...
Problem : A cryogenic flui d is flowing in a 304 SS pipe. The pipe is...
Problem
:
A cryogenic flui
d is flowing in a
304 SS
pipe.
The pipe is insulated
on its outside surface
with
6
-
mm thick,
evacuated,
aluminum foil/glass mat insulation.
(“Evacuated” means a partial vacuum is drawn on the
insulation to
remove air that would otherwise fill
pores inside the insulation.)
The pipe
inside diameter
is 127 mm; it’s outside diameter is 138 mm.
The
fluid temperature is
-
173
o
C
.
T
he
air temperature
outside the...
The surface of a furnace wall is at a temperature of 1350oC. The outside wall temperature...
The surface of a furnace wall is at a temperature of 1350oC. The outside wall temperature is 42oC. The furnace wall is made of 25 cm of refractory material having a thermal conductivity of 1.4 W/moK. The outside wall is steel, 1 cm thick with thermal conductivity of 47 W/moK. Calculate the thickness in meters of brick to be installed in between the refractory material and steel if its thermal conductivity is 0.28 W/moK and the heat loss is not...
Consider the rate of heat conduction through a double-paned window that has a 1.45-m2 area and...
Consider
the rate of heat conduction through a double-paned window that has
a 1.45-m2 area and is made of two panes of
0.715-cm-thick glass separated by a 1.25-cm air gap. You can ignore
the increased heat transfer in the air gap due to convection.
Calculate the rate of heat conduction through this window, in
watts, given that the inside surface temperature is 15.0°C, while
the outside temperature is -10.0°C. Make the assumption that the
temperature differences across the two glass...
A concrete wall of a house is 45 cm thick and has a surface area 20m x 5 m. The inside temperature of the wall is 47 °C and the outside air temperature is 14 °C. Thermal conductivity of the concrete wall is 0.8 W/mK. Calculate the heat transfer rate through the wall by conduction and its thermal resistance.
Heat Transfer
-A wall 20 cm thick is to be constructed from material that has an average thermal conductivity of 2 W/m C. The wall is to be insulated with 5cm material having an average thermal conductivity of 0.5W/m C. Assuming that the inner and outer surface temperatures of the insulated wall are 200 and 20°C, calculate the heat transfer per unit area and the intermediate Temperature between the insulation and the wall.
Problem
:
A cryogenic flui
d is flowing in a
304 SS
pipe.
The pipe is insulated
on its outside surface
with
6
-
mm thick,
evacuated,
aluminum foil/glass mat insulation.
(“Evacuated” means a partial vacuum is drawn on the
insulation to
remove air that would otherwise fill
pores inside the insulation.)
The pipe
inside diameter
is 127 mm; it’s outside diameter is 138 mm.
The
fluid temperature is
-
173
o
C
.
T
he
air temperature
outside the...
Consider
the rate of heat conduction through a double-paned window that has
a 1.45-m2 area and is made of two panes of
0.715-cm-thick glass separated by a 1.25-cm air gap. You can ignore
the increased heat transfer in the air gap due to convection.
Calculate the rate of heat conduction through this window, in
watts, given that the inside surface temperature is 15.0°C, while
the outside temperature is -10.0°C. Make the assumption that the
temperature differences across the two glass...
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