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Assignment heat transfer chapter 1, Assignments of Heat and Mass Transfer

An-Najah National UniversityHeat and Mass Transfer
Prof. Majed Shahada

Chapter 1 introduction assignment 2024_2025 Dr Majed shahade Heat transfer

Typology: Assignments

2023/2024

Uploaded on 10/27/2024

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Department of Chemical Engineering
Department of Energy and Environmental Engineering
Heat Transfer (10626232)
Homework 2 (Chapter 1)
Instructor Name: Dr. Majd Shhadi
Student Name:……………………….......
Academic Year: 2024/2025
Registration Number:……………….....
Semester: Fall
Serial Number:……………………………..
Credit Hours: 3
Section: ……………………………………….
Date: October 3, 2024
Deadline: October 9, 2024
Homework Grade Summary
Notes:
1. Please read each problem carefully and completely before attempting to solve it.
2. To receive full credit for a solution, you must state all equations that you use, and you must
state all values substituted in those equations. If you’re running short on time, at least write
down some basic equations for the calculation problems.
3. If you use values from a table, state which table you use.
4. All results must be expressed in appropriate UNITS.
Good Luck
Required Time
Question Grade
CLO
Points
Question
ii
20
Q1
ii
30
Q2
Student Grade
An-Najah National University
Faculty of Engineering and IT
pf2

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Department of Chemical Engineering Department of Energy and Environmental Engineering Heat Transfer (10626232) Homework 2 (Chapter 1 ) Instructor Name: Dr. Majd Shhadi Student Name:………………………....... Academic Year: 2024 /202 5 Registration Number:………………..... Semester: Fall Serial Number:…………………………….. Credit Hours: 3 Section: ………………………………………. Date : October 3, 2024 Deadline : October 9 , 2024 Homework Grade Summary

Notes:

  1. Please read each problem carefully and completely before attempting to solve it.
  2. To receive full credit for a solution, you must state all equations that you use, and you must state all values substituted in those equations. If you’re running short on time, at least write down some basic equations for the calculation problems.
  3. If you use values from a table, state which table you use.
  4. All results must be expressed in appropriate UNITS.

Good Luck

Question Points CLO Question Grade Required Time Q1 20 ii Q2 30 ii Student Grade

An-Najah National University Faculty of Engineering and IT

Q1) Problem 1-107 from the textbook Q 2 ) The wall of an oven used to cure plastic parts has a thickness of L = 0.0 6 m and is exposed to large surroundings and air at its outer surface. The air and the surroundings are at 25 C. a) If the temperature of the outer surface is 125 C and its convection coefficient and emissivity are h = 20 W/m^2. K and  = 0.8, respectively, determine the temperature of the inner surface given that the wall has a thermal conductivity of k = 0.7 W/m K b) Consider conditions for which the temperature of the inner surface is maintained at 325 C, while the air and large surroundings to which the outer surface is exposed are maintained at 25 C. Explore the effects of variations in h on (i) The temperature of the outer surface (ii) The heat flux through the wall, and Plot (by using Excel). the rate of heat flux and outer surface temperature as a function of the heat transfer coefficient in the range of 2 W/m^2. K to 200 W/m^2. K. Discuss the results.