ENME315-21S2 (C) Semester Two 2021

# Heat Transfer

15 points

Details:
 Start Date: Monday, 19 July 2021 End Date: Sunday, 14 November 2021
Withdrawal Dates
Last Day to withdraw from this course:
• Without financial penalty (full fee refund): Sunday, 1 August 2021
• Without academic penalty (including no fee refund): Friday, 1 October 2021

## Description

This course provides a comprehensive introduction to heat transfer fundamentals and their applications. The course introduces students to the analysis of steady-state and transient one- and multi-dimensional heat conduction. The course considers the analysis of heat transfer by convection using empirical and boundary layer approximations. Radiation heat transfer is considered with applications to multi-body radiation.

Topics Covered
1.Energy Balance on a Surface
2.Heat Conduction Modelling in 1-D
3.Steady State Heat Conduction, Circuit Model
4.Extended Surfaces
5.Numerical Solutions of Conduction Equations
6.Transient Heat Conduction
7.Convection Heat Transfer Fundamentals
8.External Forced Convection
9.Internal Forced Convection
10. Heat and Mass Transfer Analogy
11.Natural Convection
12.Boiling and Condensation
13.Heat Exchangers

Contribution to Professional Competencies

Heat transfer is an essential engineering science.
Deep learning is much more important than memorizing equations.
Understanding the heat transfer phenomena and the thermal system modelling approach is more important than finding the right equation.
Heat transfer is necessary for process and product design, but this class focuses much more on the engineering science you need to bring effective thermal design into any project.

## Learning Outcomes

1. Understand a thermal system, develop the schematic diagram for the system, and apply energy balance and heat transfer models to develop governing equations.
2. Set up and solve for heat transfer rates as a function of geometry and materials in 1-D conduction using various tools:
i. Material Properties
ii. Fourier’s Law
iii. Circuit Analogy
3. Estimate heat transfer from Extended Surfaces, Radial Geometry, and involving Energy Generation.
4. Construct a transient heat transfer analysis, testing for the lumped capacitance approximation and understanding the assumptions.
5. Understand the approach for setting up numerical analysis of heat transfer.
6. Understand a thermal system with convection heat transfer, construct a schematic diagram for the system, characterize the geometry and flow conditions, and apply the appropriate convection models:
i. Boundary layer effects, laminar and turbulent flow
ii. Similarity solutions and non-dimensional parameters
iii. Reynold’s analogy
iv. Boundary conditions – derivation of energy balance
v. Use convection correlations for Nusselt Number
7. Understand and model external forced convection heat transfer.
8. Understand and model internal forced convection heat transfer.
9. Understand and model natural convection heat transfer.
10. Understand the phenomena of boiling and condensation.
11. Understand heat exchangers and carry out analysis to select and size heat exchangers for liquid-liquid, liquid-gas, gas-gas, and condensers and boilers.
12. Understand key aspects of radiation heat transfer and solve simple problems. Understand radiative properties and models like black body, surface emission and radiosity.
13. Understand and estimate view factors and compute radiation exchange between grey surfaces.

## Prerequisites

ENME215 or ENME204

ENME305

## Assessment

Assessment Due Date Percentage
Final Exam 45%
Homework & Labs 10%
Quiz 1 11 Aug 2021 15%
Quiz 2 22 Sep 2021 15%
Quiz 3 20 Oct 2021 15%

## Textbooks / Resources

#### Required Texts

Cengel, Yunus A. , Ghajar, Afshin J., Kanoglu, Mehmet; Heat and mass transfer :fundamentals & applications ; Fifth edition in SI units; Mcgraw Hill Education, 2015.

Chapters of the Text Covered

1.Energy balance, energy transfer mechanisms and modelling approach. Properties. The systematic problem solving approach.
2.Heat Conduction Equation & boundary conditions. 1-D solutions
3.Steady heat conduction using the circuit analogy. Fins. 2-D approximations. R-Values
4.Transient heat transfer analytical solutions and graphical solutions using the Heisler charts. Biot and Fourier Numbers.
5.Skip
6.Convection. Reynolds Number. Nusselt Number. Mechanisms and phenomena. Viscous and Thermal boundary layers. Prandtl Number. (Skip analytical solutions 6.7, 6.8)
7.External Forced Convection – Empirical Correlations. Momentum, Heat and Mass Transfer Analogy (Chapter 14) Heat and Mass Transfer and evaporation rate (Chapter 14).
8.Internal Forced Convection – Pipes and ducts
9.Natural Convection. Grashoff Number
10.Boiling and Condensation. Critical boiling, steady boiling, onset of condensation
11.Heat Exchangers. Effectiveness, NTU methods for right-sizing
13.Radiation Heat Transfer Engineering. View factor, Exchange between surfaces, heat shields

Harassment
* Harassment of any sort will not be tolerated.  Each UC student is here to learn and to experience a friendly and supportive community.
* It is every student's right to expect: respect and courtesy from staff and other students, including freedom from harassment of any sort; fair treatment; the ability to speak out about any issues that concern them, without fear of consequences for their safety and well-being.
* Furthermore, each student has the responsibility to: respect the rights and property of others; attend to their own health and safety, and that of others; and behave in a manner towards each other that does not reflect badly on the student body or the University.
* If you, or someone you know, has experienced harassment, please talk to your lecturers, directors of study, or head of department.

Dishonest Practice
* Plagiarism, collusion, copying, and ghost writing are unacceptable and dishonest practices.
* Plagiarism is the presentation of any material (test, data, figures or drawings, on any medium including computer files) from any other source without clear and adequate acknowledgment of the source.
* Collusion is the presentation of work performed in conjunction with another person or persons, but submitted as if it has been completed only by the named author(s).
* Copying is the use of material (in any medium, including computer files) produced by another person(s) with or without their knowledge and approval.
* Ghost writing is the use of another person(s) (with or without payment) to prepare all or part of an item submitted for assessment.

Do not engage in dishonest practices. The Department reserves the right to refer dishonest practices to the University Proctor and where appropriate to not mark the work.
The University regulations on academic integrity and dishonest practice can be found here.

## Indicative Fees

Domestic fee \$986.00

International fee \$5,500.00

* All fees are inclusive of NZ GST or any equivalent overseas tax, and do not include any programme level discount or additional course-related expenses.

For further information see Mechanical Engineering .

## All ENME315 Occurrences

• ENME315-21S2 (C) Semester Two 2021