T. 12 1 Ti 1. 2. 3. 4" Common Brick 1/2" OSB Sheathing 3-1/2" x 1-1/2" (2x4) Yellow Pine Studding placed on 16" center 4. 3-1/2" Figerglass Insulation 5. 1/2" Drywall A wall of a house as shown in the accompanying sketch is 10 ft. high and 30 ft. long and has no windows. The outside heat transfer coefficient, h., is 6.0 Btu/hr ft2°F and the inside convective heat transfer coefficient hi is 1.45 Btu/hr ft2°F. 6. Calculate the heat loss through the wall if the house is heated such that the room air temperature, Ti, is 70°F on a day when the outside air temperature, T., is 0°F. State all assumptions and list the thermal resistances and thermal conductivities for 3 each selection of the wall. 7. For this problem, what would be the value of the overall heat transfer coefficient, U? Ans: U = 0.056 Btu/hr ft2ºF 8. You are asked to design a metal hot dog holder for roasting hot dogs over an open campfire. The holder is to be designed such that while the end holding the hot dog becomes cherry red (1400°F), the other end can still be held without using an insulated handle or glove (~95°F). Design it such that it can be used even on a warm, still day, T₁ = 90°F (Assume the convective heat transfer coefficient, h, for a horizontal cylinder is uniform over the whole cylinder and equal to 4.0 Btu/hrft2°F)

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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To
8.
Ti
1.
2.
3.
4" Common Brick
1/2" OSB Sheathing
3-1/2" x 1-1/2" (2x4) Yellow Pine
Studding placed on 16" center
4.
5.
3-1/2" Figerglass Insulation
1/2" Drywall
A wall of a house as shown in the
accompanying sketch is 10 ft. high and 30
ft. long and has no windows. The outside
heat transfer coefficient, h., is 6.0 Btu/hr
ft2°F and the inside convective heat transfer
coefficient hi is 1.45 Btu/hr ft2°F.
6. Calculate the heat loss through the
wall if the house is heated such that the
room air temperature, Ti, is 70°F on a day
when the outside air temperature, T., is 0°F.
State all assumptions and list the thermal
resistances and thermal conductivities for
3 each selection of the wall.
7.
For this problem, what would be the
value of the overall heat transfer coefficient, U?
Ans: U = 0.056 Btu/hr ft2ºF
You are asked to design a metal hot dog holder for roasting hot dogs over an open
campfire. The holder is to be designed such that while the end holding the hot dog
becomes cherry red (1400°F), the other end can still be held without using an
insulated handle or glove (~95°F). Design it such that it can be used even on a
warm, still day, T₁ = 90°F (Assume the convective heat transfer coefficient, h, for
a horizontal cylinder is uniform over the whole cylinder and equal to 4.0
Btu/hrft2°F)

Expert Solution

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Since you have asked multiple question, we will solve the first question for you. If you want any specific question to be solved then please specify the question number or post only that question.

Given data:

Wall height = 10 ft

Wall length = 30 ft

Layers of the wall (in order from outside to inside):

L1 = 4" Common Brick

L2 = 1/2" OSB Sheathing

L3 = 3-1/2" Figerglass Insulation

L4 = 3-1/2"

L5 = 1/2"

Outside heat transfer coefficient, h_a = 6.0 Btu/hr ft²°F

Inside convective heat transfer coefficient, hi = 1.45 Btu/hr ft²°F

Room air temperature, T_i = 70°F

Outside air temperature, T_a = 0°F

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