Heat Transfer

 

Mechanical Engineering, Publication in the Diário da República - Despacho nº 14312/2015 - 02/12/2015

5 ECTS; 2º Ano, 2º Semestre, 15,0 T + 15,0 PL + 30,0 TP + 3,50 OT

Lecturer
- Flávio Rodrigues Fernandes Chaves

Prerequisites
Not applicable.

Objectives
An initial approach to Heat Transfer is presented from the point of view of the Mechanical Engineer. The application examples address situations encountered by Mechanical Engineers in their daily work. Previous concepts are reviewed, and the contents of the course aim to provide a solid foundation for subsequent courses.

Program
1. INTRODUCTION
1.1 Areas of application of heat transfer
1.2 Conduction heat transmission

1.5 Principle of energy conservation: Thermal Balances
1.6 Methodology for solving heat transmission problems
2. HEAT CONDUCTING
2.1 Introduction
2.2 One-dimensional heat conduction equation
2.3 General heat conduction equation
2.4 Frontier and initial conditions
3. CONDUCTING HEAT ON A UNIDIMENSIONAL PERMANENT REGIME AND WITHOUT HEAT GENERATION
3.1 Semi-infinite systems bounded by two flat surfaces
3.2 Cylindrical systems of infinite length
3.3 Critical insulation thickness
3.4 Spherical systems
4. CONDITIONING OF HEAT IN A PERMANENT, UNIDIMENSIONAL REGION AND WITH VOLUME SOURCES OF HEAT
4.1 Semi-infinite systems limited by two flat surfaces
4.2 Cylindrical systems of infinite length
5. FINS
5.1 Introduction
5.2 Theoretical approach

5.6 Overall heat transfer coefficient
6. CONDUCTING HEAT IN TRANSIENT REGIME
6.1 Introduction
6.2 Number of Biot
6.3 Bi <0.1: Body of negligible thermal resistance
6.4 Bi> 0.1: Considerable internal thermal resistance body
7. CONVECTION
7.1 Fundamental concepts
7.2 Development of the speed limit layer

7.5 Forced convection in flow through bundles of tubes
7.6 Natural convection: Determination of the h coefficient, empirical relations
8. HEAT EXCHANGERS: TYPES OF HEAT EXCHANGERS
8.1 Introduction
8.2 Types of heat exchangers

8.7 Methodology for calculating heat exchangers
8.8 Compact heat exchangers
9. RADIATION IN TRANSPARENT MEDIA

Evaluation Methodology
Written Test and laboratorial work

Bibliography
- Çengel, Y. e Ghajar, A. (2015). Heat and mass transfer: fundamentals & applications. EUA: McGraw-Hill
- Figueiredo, R. (2015). Transmissão de Calor. Lisboa: Lidel
- Incropera, F. (2002). Fundamentals of Heat end mass transfer. (Vol. -). -: John Wiley & Sons

Method of interaction
Slideshows. Examples of application exercises will be solved and, whenever necessary, laboratory experiments demonstrating the concepts learned will be carried out.

Software used in class
Hourly Analisys Program - HAP