Heat Transfer

Overview

Detailed Syllabus - Lectures:

Forced Convection (3 hours):
 Newton's Law of cooling.
 Convective heat transfer coefficient.
 Nusselt number, Reynold number, Prandtl number
 Boundary layer theory.
 Flow over different geometries.
 Logarithmic mean temperature difference.

Natural Convection (2 hours):
 Physical mechanism of natural convection, volume expansion coefficient, Grashof number.
 Natural convection correlations.
 Combined natural and forced convection.

Heat Exchangers (5 hours):
 Basic equations in heat exchanger design.
 Overall heat transfer coefficient.
 Log mean temperature difference – calculation for parallel-flow and counter-flow heat exchangers, special operating conditions for condensers, evaporators/boilers, and correction factors for multipass and cross-flow heat exchangers.
 The heat exchanger effectiveness (ε) – number of transfer units (NTU) method for heat exchanger analysis for various types of heat exchangers.
 Shell-and-tube heat exchanger design and sizing.
 Design procedure, construction details, and design considerations.
 Tube-side and shell-side heat transfer and pressure drop.

Unsteady State Heat Transfer (4 hours):
 Unsteady state conduction equation.
 Lumped capacitance method.
 Unsteady state heat conduction in various geometries: analytical method, semi-infinite solid, unsteady state in large flat plates.
 Charts for average temperature in plates, cylinders, and spheres with negligible resistance.


Detailed Syllabus –Tutorials (8 Hours):
The students are provided with tutorials and worked examples of the above lecture material. Tutorial classes are an integral element of the module.

 1.Forced and natural convection (3 hours ) - Dr. M. Blesic
 2.Heat exchangers (3 hours) – Dr. M. Blesic
 3.Unsteady state heat transfer (2 hours ) - Dr. M. Blesic

Detailed Syllabus – Labs (4 Hours):
Students will be divided into groups. Each group will carry out experiments based on:

 1. Boiler Heat Transfer Unit (2 hours)
 2. Turbulent Flow Counter-Current Heat Exchanger (2 hours)

Learning Objectives

On completion of this module the student should be able to:

 Explain and apply the concept of convective heat transfer (A)
 Understand in depth the unsteady state heat transfer (E)
 Apply the concept of the heat exchanger analysis, design, and sizing (E)

Skills

Learners are expected to demonstrate the following on completion of the module:
 Application of the concepts of heat transfer and design of operating units.
 Improved mathematical and problem-solving skills.
 An ability to use general computer packages for solving chemical engineering design problems.

Assessment

Course Requirements:
 Lab attendance 80 %
 Post-lab assignment submission 80 %
 Examination mark veto 40%
 Laboratory mark veto 40 %
 Assignment veto 40%
 Module pass mark veto 40 %