Homework Answers
for question B more information needed because they have to say clearly inside wall or outside wall
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An incinarator with (0.6) inch steel walls in lined with (6) inch of firebrick to protect...
1. A ¾ inch (nominal), Schedule 40, mild steel pipe carries 40 psia steam through a...
1. A ¾ inch (nominal), Schedule 40, mild steel pipe carries 40 psia steam through a room having an air temperature of 80°F. The pipe is covered with a 0.125 ft thick layer of fiberglass insulation having a thermal conductivity of 0.037 Btu/(h ft ‘F). The hi value on the steam side of the pipe is 1000 Btu/h ft2 °F. The ho value on the outside of the insulation is 2.0 Btu/(h ft2 ’F). For the mild steel, k=26Btu/(ft H...
Heat Transfer Problems 1. A window pane (1/8 inch thick) in an old house owned by...
Heat Transfer
Problems 1. A window pane (1/8 inch thick) in an old house owned by a professor is 3 ft. by 4 ft. He likes to be warm in the winter so the inside temperature is kept at 70 °F even when the outside temperature is 10 •F. For this problem assume the inside and outside temperatures are for the window surface. How much heat is transferred through the window (k=.54 BTU/hr ft ° F)? 2. A small heated...
A pipe with insulation material is used to carry steam to an operating plant. The conditions...
A pipe with insulation material is used to carry steam to an operating plant. The conditions and dimensions for the system are as follows Variable Value Length of pipe, L 100 ft Inner diameter of pipe, Do 1 inch Outer diameter of pipe, D1 1.24 inches Outer diameter of insulation, D2 2 inches Inside film heat transfer coefficient for condensing saturated steam, ho 800 Btu/hr-ft2.oF Outside film heat transfer coefficient for air, ht 2 Btu/hr-ft2.oF Thermal conductivity of the pipe,...
A 100 ft2 wall consists of 4 in of red brick (k = 0.38 Btu-ft/hr-ft-°F), 1...
A 100 ft2 wall consists of 4 in of red brick (k = 0.38 Btu-ft/hr-ft-°F), 1 inch of pine (k = 0.06 Btu-ft/hr- ft-°F) and 42 inch of plaster board (k = 0.30 Btu-ft/hr-ft-°F). The internal and external film heat transfer coefficients are 1.65 Btu/hr-ft-°F and 6.00 Btu/hr-ft-'F respectively. The inside and outside air temperatures are 72 °F and 30 °F respectively. The heat transfer rate is:
A 6 in. schedule 80 steel pipe (OD=6.62 in.) will be used to transport 450◦F steam...
A 6 in. schedule 80 steel pipe (OD=6.62 in.) will be used to transport 450◦F steam from a boiler house to a new process unit. The pipe will be buried at a depth of 3 ft (to the pipe centerline). The soil at the plant site has an average thermal conductivity of 0.4 Btu/h · ft · ◦F and the minimum expected ground surface temperature is 20◦F. Estimate the rate of heat loss per foot of pipe length for the...
please answer my heat transfer problem thank you!! heat transfer problem a furnace wall is constructed...
please answer my heat transfer problem thank you!! heat transfer problem a furnace wall is constructed of firrebrick 6in thick. The temperature of the wall is 1300F, and the T outside of the wall is 175 F. If the mean thermal conductivity under these conditions is 0.17 BTU/h-ft-F, what is the rate of heat loss through a 10 ft2 wall of the surface? ans. 3825 BTU/hr
I need MATLAb programming for above example . Ido not want ay theory or numerical explaination...
I need MATLAb programming for above example . Ido not want ay
theory or numerical explaination
8. In order to increase the thermal resistance of a typical exterior frame wall, such as the one in Example 1.2, t is customary to use 2 × 6 studs instead of 2 × 4 studs to allow for place ment of more insulation within the wall cavity. A typical exterior (2 X 6) frame wall of a house consists of the materials shown...
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...
A 15-foot steel (k 7.2 Btu/h ft F) pipe is carrying steam at a temperature of...
A 15-foot steel (k 7.2 Btu/h ft F) pipe is carrying steam at a temperature of 250 F. The pipe geometry has the following dimensions: inner diameter 4" and an outer diameter 4.8". The outside surface of the pipe is cooled via convection-assume convection coefficient (h) 125 Btu/h ft2 F. If the temperature of the outer surface of the pipe is 160 F address the following: (a) develop an expression for the heat equation and associated boundary conditions and (b)...
Calculate the R-value and U-value for the following wall: (from outside to inside) 8" concrete block,...
Calculate the R-value and U-value for the following wall: (from outside to inside) 8" concrete block, 1" air space, 1" cellular polyurethane insulation,,3.5" batt insulation with steel studs,1/2" drywall B) For the wall above, calculate the temperature at each material interface point. Assume the interior space temperature is 72F db and the outside air temperature is -15F db. C) Calculate the peak heat loss in terms of BTU/hr if the above wall is 30 ft long and 10 ft high.
Heat Transfer
Problems 1. A window pane (1/8 inch thick) in an old house owned by a professor is 3 ft. by 4 ft. He likes to be warm in the winter so the inside temperature is kept at 70 °F even when the outside temperature is 10 •F. For this problem assume the inside and outside temperatures are for the window surface. How much heat is transferred through the window (k=.54 BTU/hr ft ° F)? 2. A small heated...
A pipe with insulation material is used to carry steam to an operating plant. The conditions and dimensions for the system are as follows Variable Value Length of pipe, L 100 ft Inner diameter of pipe, Do 1 inch Outer diameter of pipe, D1 1.24 inches Outer diameter of insulation, D2 2 inches Inside film heat transfer coefficient for condensing saturated steam, ho 800 Btu/hr-ft2.oF Outside film heat transfer coefficient for air, ht 2 Btu/hr-ft2.oF Thermal conductivity of the pipe,...
A 100 ft2 wall consists of 4 in of red brick (k = 0.38 Btu-ft/hr-ft-°F), 1 inch of pine (k = 0.06 Btu-ft/hr- ft-°F) and 42 inch of plaster board (k = 0.30 Btu-ft/hr-ft-°F). The internal and external film heat transfer coefficients are 1.65 Btu/hr-ft-°F and 6.00 Btu/hr-ft-'F respectively. The inside and outside air temperatures are 72 °F and 30 °F respectively. The heat transfer rate is:
I need MATLAb programming for above example . Ido not want ay
theory or numerical explaination
8. In order to increase the thermal resistance of a typical exterior frame wall, such as the one in Example 1.2, t is customary to use 2 × 6 studs instead of 2 × 4 studs to allow for place ment of more insulation within the wall cavity. A typical exterior (2 X 6) frame wall of a house consists of the materials shown...
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...
A 15-foot steel (k 7.2 Btu/h ft F) pipe is carrying steam at a temperature of 250 F. The pipe geometry has the following dimensions: inner diameter 4" and an outer diameter 4.8". The outside surface of the pipe is cooled via convection-assume convection coefficient (h) 125 Btu/h ft2 F. If the temperature of the outer surface of the pipe is 160 F address the following: (a) develop an expression for the heat equation and associated boundary conditions and (b)...
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