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An unplastered brickwork has a resistivity of 0.83 m degC/W. For a 230 mm thick brick wall, the inside
and outside surface resistances are 0.123 and 0.1 m2 degC/W respectively.
and outside surface resistances are 0.123 and 0.1 m2 degC/W respectively.
Q.
The brick wall has an overall dimension of 6m x 3m with a 1m x 2m window assembly (U-value =
2.5 W/m2 degC) and a 1m x 2.1m door assembly (U-value = 1.25 W/m2 degC). The overall U-value
of the wall (UO) (in W/m2 degC) is
2.5 W/m2 degC) and a 1m x 2.1m door assembly (U-value = 1.25 W/m2 degC). The overall U-value
of the wall (UO) (in W/m2 degC) is
- a)1.8
- b)2.3
- c)2.6
- d)3.7
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
An unplastered brickwork has a resistivity of 0.83 m degC/W. For a 230...
To calculate the overall U-value of the wall, we need to consider the heat transfer through the different components of the wall, including the brickwork, window assembly, and door assembly.
1. Heat transfer through the brickwork:
The heat transfer through the brickwork can be calculated using the formula:
Rbrick = (Lbrick / kbrick) * Abrick
where Rbrick is the thermal resistance of the brickwork, Lbrick is the thickness of the brick wall, kbrick is the resistivity of the brickwork, and Abrick is the area of the brick wall.
Given:
Lbrick = 230 mm = 0.23 m
kbrick = 0.83 m degC/W
Abrick = 6 m * 3 m = 18 m^2
Using the formula, we can calculate the thermal resistance of the brickwork:
Rbrick = (0.23 / 0.83) * 18 = 4.95 m^2 degC/W
2. Heat transfer through the window assembly:
The heat transfer through the window assembly can be calculated using the formula:
Rwindow = 1 / Uwindow
where Rwindow is the thermal resistance of the window assembly and Uwindow is the U-value of the window assembly.
Given:
Uwindow = 2.5 W/m^2 degC
Using the formula, we can calculate the thermal resistance of the window assembly:
Rwindow = 1 / 2.5 = 0.4 m^2 degC/W
3. Heat transfer through the door assembly:
The heat transfer through the door assembly can be calculated using the formula:
Rdoor = 1 / Udoor
where Rdoor is the thermal resistance of the door assembly and Udoor is the U-value of the door assembly.
Given:
Udoor = 1.25 W/m^2 degC
Using the formula, we can calculate the thermal resistance of the door assembly:
Rdoor = 1 / 1.25 = 0.8 m^2 degC/W
4. Overall U-value of the wall:
The overall U-value of the wall can be calculated using the formula:
UO = 1 / (Rbrick + Rwindow + Rdoor)
where UO is the overall U-value of the wall.
Using the formula, we can calculate the overall U-value of the wall:
UO = 1 / (4.95 + 0.4 + 0.8) = 1 / 6.15 = 0.16 W/m^2 degC
Since the question asks for the overall U-value in W/m^2 degC, the answer is approximately 0.16 W/m^2 degC. However, none of the given options match this answer. Therefore, there may be an error in the question or the options provided.
1. Heat transfer through the brickwork:
The heat transfer through the brickwork can be calculated using the formula:
Rbrick = (Lbrick / kbrick) * Abrick
where Rbrick is the thermal resistance of the brickwork, Lbrick is the thickness of the brick wall, kbrick is the resistivity of the brickwork, and Abrick is the area of the brick wall.
Given:
Lbrick = 230 mm = 0.23 m
kbrick = 0.83 m degC/W
Abrick = 6 m * 3 m = 18 m^2
Using the formula, we can calculate the thermal resistance of the brickwork:
Rbrick = (0.23 / 0.83) * 18 = 4.95 m^2 degC/W
2. Heat transfer through the window assembly:
The heat transfer through the window assembly can be calculated using the formula:
Rwindow = 1 / Uwindow
where Rwindow is the thermal resistance of the window assembly and Uwindow is the U-value of the window assembly.
Given:
Uwindow = 2.5 W/m^2 degC
Using the formula, we can calculate the thermal resistance of the window assembly:
Rwindow = 1 / 2.5 = 0.4 m^2 degC/W
3. Heat transfer through the door assembly:
The heat transfer through the door assembly can be calculated using the formula:
Rdoor = 1 / Udoor
where Rdoor is the thermal resistance of the door assembly and Udoor is the U-value of the door assembly.
Given:
Udoor = 1.25 W/m^2 degC
Using the formula, we can calculate the thermal resistance of the door assembly:
Rdoor = 1 / 1.25 = 0.8 m^2 degC/W
4. Overall U-value of the wall:
The overall U-value of the wall can be calculated using the formula:
UO = 1 / (Rbrick + Rwindow + Rdoor)
where UO is the overall U-value of the wall.
Using the formula, we can calculate the overall U-value of the wall:
UO = 1 / (4.95 + 0.4 + 0.8) = 1 / 6.15 = 0.16 W/m^2 degC
Since the question asks for the overall U-value in W/m^2 degC, the answer is approximately 0.16 W/m^2 degC. However, none of the given options match this answer. Therefore, there may be an error in the question or the options provided.
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An unplastered brickwork has a resistivity of 0.83 m degC/W. For a 230 mm thick brick wall, the insideand outside surface resistances are 0.123 and 0.1 m2 degC/W respectively.Q.The brick wall has an overall dimension of 6m x 3m with a 1m x 2m window assembly (U-value =2.5 W/m2 degC) and a 1m x 2.1m door assembly (U-value = 1.25 W/m2 degC). The overall U-valueof the wall (UO) (in W/m2 degC) isa)1.8b)2.3c)2.6d)3.7Correct answer is option 'B'. Can you explain this answer?
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An unplastered brickwork has a resistivity of 0.83 m degC/W. For a 230 mm thick brick wall, the insideand outside surface resistances are 0.123 and 0.1 m2 degC/W respectively.Q.The brick wall has an overall dimension of 6m x 3m with a 1m x 2m window assembly (U-value =2.5 W/m2 degC) and a 1m x 2.1m door assembly (U-value = 1.25 W/m2 degC). The overall U-valueof the wall (UO) (in W/m2 degC) isa)1.8b)2.3c)2.6d)3.7Correct answer is option 'B'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about An unplastered brickwork has a resistivity of 0.83 m degC/W. For a 230 mm thick brick wall, the insideand outside surface resistances are 0.123 and 0.1 m2 degC/W respectively.Q.The brick wall has an overall dimension of 6m x 3m with a 1m x 2m window assembly (U-value =2.5 W/m2 degC) and a 1m x 2.1m door assembly (U-value = 1.25 W/m2 degC). The overall U-valueof the wall (UO) (in W/m2 degC) isa)1.8b)2.3c)2.6d)3.7Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An unplastered brickwork has a resistivity of 0.83 m degC/W. For a 230 mm thick brick wall, the insideand outside surface resistances are 0.123 and 0.1 m2 degC/W respectively.Q.The brick wall has an overall dimension of 6m x 3m with a 1m x 2m window assembly (U-value =2.5 W/m2 degC) and a 1m x 2.1m door assembly (U-value = 1.25 W/m2 degC). The overall U-valueof the wall (UO) (in W/m2 degC) isa)1.8b)2.3c)2.6d)3.7Correct answer is option 'B'. Can you explain this answer?.
An unplastered brickwork has a resistivity of 0.83 m degC/W. For a 230 mm thick brick wall, the insideand outside surface resistances are 0.123 and 0.1 m2 degC/W respectively.Q.The brick wall has an overall dimension of 6m x 3m with a 1m x 2m window assembly (U-value =2.5 W/m2 degC) and a 1m x 2.1m door assembly (U-value = 1.25 W/m2 degC). The overall U-valueof the wall (UO) (in W/m2 degC) isa)1.8b)2.3c)2.6d)3.7Correct answer is option 'B'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about An unplastered brickwork has a resistivity of 0.83 m degC/W. For a 230 mm thick brick wall, the insideand outside surface resistances are 0.123 and 0.1 m2 degC/W respectively.Q.The brick wall has an overall dimension of 6m x 3m with a 1m x 2m window assembly (U-value =2.5 W/m2 degC) and a 1m x 2.1m door assembly (U-value = 1.25 W/m2 degC). The overall U-valueof the wall (UO) (in W/m2 degC) isa)1.8b)2.3c)2.6d)3.7Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An unplastered brickwork has a resistivity of 0.83 m degC/W. For a 230 mm thick brick wall, the insideand outside surface resistances are 0.123 and 0.1 m2 degC/W respectively.Q.The brick wall has an overall dimension of 6m x 3m with a 1m x 2m window assembly (U-value =2.5 W/m2 degC) and a 1m x 2.1m door assembly (U-value = 1.25 W/m2 degC). The overall U-valueof the wall (UO) (in W/m2 degC) isa)1.8b)2.3c)2.6d)3.7Correct answer is option 'B'. Can you explain this answer?.
Solutions for An unplastered brickwork has a resistivity of 0.83 m degC/W. For a 230 mm thick brick wall, the insideand outside surface resistances are 0.123 and 0.1 m2 degC/W respectively.Q.The brick wall has an overall dimension of 6m x 3m with a 1m x 2m window assembly (U-value =2.5 W/m2 degC) and a 1m x 2.1m door assembly (U-value = 1.25 W/m2 degC). The overall U-valueof the wall (UO) (in W/m2 degC) isa)1.8b)2.3c)2.6d)3.7Correct answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for GATE.
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An unplastered brickwork has a resistivity of 0.83 m degC/W. For a 230 mm thick brick wall, the insideand outside surface resistances are 0.123 and 0.1 m2 degC/W respectively.Q.The brick wall has an overall dimension of 6m x 3m with a 1m x 2m window assembly (U-value =2.5 W/m2 degC) and a 1m x 2.1m door assembly (U-value = 1.25 W/m2 degC). The overall U-valueof the wall (UO) (in W/m2 degC) isa)1.8b)2.3c)2.6d)3.7Correct answer is option 'B'. Can you explain this answer?, a detailed solution for An unplastered brickwork has a resistivity of 0.83 m degC/W. For a 230 mm thick brick wall, the insideand outside surface resistances are 0.123 and 0.1 m2 degC/W respectively.Q.The brick wall has an overall dimension of 6m x 3m with a 1m x 2m window assembly (U-value =2.5 W/m2 degC) and a 1m x 2.1m door assembly (U-value = 1.25 W/m2 degC). The overall U-valueof the wall (UO) (in W/m2 degC) isa)1.8b)2.3c)2.6d)3.7Correct answer is option 'B'. Can you explain this answer? has been provided alongside types of An unplastered brickwork has a resistivity of 0.83 m degC/W. For a 230 mm thick brick wall, the insideand outside surface resistances are 0.123 and 0.1 m2 degC/W respectively.Q.The brick wall has an overall dimension of 6m x 3m with a 1m x 2m window assembly (U-value =2.5 W/m2 degC) and a 1m x 2.1m door assembly (U-value = 1.25 W/m2 degC). The overall U-valueof the wall (UO) (in W/m2 degC) isa)1.8b)2.3c)2.6d)3.7Correct answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
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