Print this page Basic Fundamentals of Heat Transfer
A. Bhatia, B.E.
Course Outline
Many operations
in commercial and industrial environments involve the production or absorption
of energy in form of heat. The basic laws and the fundamentals of heat transfer
used to control the flow and transfer of heat are of great importance in efficient
facilities management. This course explains the fundamental principles and practical
applications of heat transfer.
This 3-hr course material is based entirely on US Department of Energy training
materials DOE-HDBK-1012/3-92, Thermodynamics, Heat Transfer, and Fluid Flow,
Volume 2 of 3. The volumes 1 & 3 of the handbook have been separately listed.
This course includes a multiple-choice quiz at the end, which is designed to
enhance the understanding of the course materials.
At the conclusion of this course, the student will:
- Describe the difference between heat, work and temperature;
- Understand Second law of thermodynamics and how it relates to heat transfer;
- Describe three modes of heat transfer; conduction, convection and radiation;
- Understand the terminology used in heat transfer such as heat flux, thermal conductivity, LMTD, overall heat transfer coefficient, bulk temperature etc.;
- Calculate the conduction heat flux in rectangular and cylindrical coordinate systems;
- Calculate the rate of heat transfer through convection;
- Describe the terms related to radiation heat transfer such as black body, emissivity etc. ;
- Describe the difference between counter flow, parallel flow, regenerative and non-regenerative heat exchangers;
- Describe the process that occurs in boiling heat transfer curve such as nucleate boiling, film boiling and bulk boiling etc.; and
- Describe the
relationship between temperature, flow and power that affect the power generation.
This course is aimed at students, mechanical and process engineers, HVAC and facility designers, contractors, estimators, energy auditors, plant layout professionals and general audience.
Course Introduction
In the simplest
of terms, the discipline of heat transfer is concerned with only two things:
temperature, and the flow of heat. Temperature represents the amount of thermal
energy available, whereas heat flow represents the movement of thermal energy
from place to place.
In this course, you are required to study the following DOE-HDBK-1012/3-92,
Thermodynamics, Heat Transfer, and Fluid Flow, Volume 2 of 3.
Course
Content
This course is based entirely on US Department of Energy training materials (US Department of Energy training materials DOE-HDBK-1012/3-92, Thermodynamics, Heat Transfer, and Fluid Flow, Volume 2 of 3).
The link to the document is Basic Fundamentals of Heat Transfer.
Course Summary
When two substances
at different temperatures are brought into thermal contact, heat will flow from
the substance at higher temperature to the substance at lower temperature. The
net flow is always in the direction of temperature decrease and the three basic
mechanisms by which heat flow occurs are conduction, convection, and radiation.
As an example, the heat transfer operation utilizing heat exchangers uses the
principles of convective heat transfer for each fluid and conduction through
the thin metal wall which acts as the heat transfer surface. The warmth one
experiences from sun is an example of radiation heat transfer.
On a microscopic scale, thermal energy is related to the kinetic energy of molecules.
The greater the material's temperature, the greater shall be the thermal agitation
of its constituent molecules (manifested both in linear motion and vibration
modes). It is natural for regions containing greater molecular kinetic energy
to pass this energy to regions with less kinetic energy.
Several material properties serve to modulate the heat transferred between two
regions at differing temperatures. Examples include thermal conductivities,
specific heats, material densities, fluid velocities, fluid viscosities, surface
emissivities, and more. Taken together, these properties serve to make the solution
of many heat transfer problems an involved process.
Quiz
Once you finish studying the above course content, you need to take a quiz to obtain the PDH credits.
DISCLAIMER: The materials contained in the online course are not intended as a representation or warranty on the part of PDH Center or any other person/organization named herein. The materials are for general information only. They are not a substitute for competent professional advice. Application of this information to a specific project should be reviewed by a registered architect and/or professional engineer/surveyor. Anyone making use of the information set forth herein does so at their own risk and assumes any and all resulting liability arising therefrom.
