Fundamentals of Temperature Control

William K. Roots

• Publisher: Academic Press
• Year: 2014
• Print ISBN:
  9781483231846
• eBook ISBN:
  9781483275758
• Topic: Physical Sciences
• Subtopic: Thermodynamics

Fundamentals of Temperature Control focuses on theoretical foundations and principles involved in temperature control. The book first offers information on thermal-process representation and response. Discussions focus on response to damped harmonic inputs, principle of superposition, bode diagrams, ramp, step, and impulse functions, harmonic response, electrical analogs, basic equations, and thermal conductivity. The text then examines common thermal elements and open-loop temperature control. The publication ponders on closed-loop temperature control and the dynamics of discontinuous temperature control. Topics include dynamics in the phase plane and time domain, dynamic analysis, closed-loop control, secondary feedback, and cooling processes. The manuscript then examines quasi-continuous and continuous temperature control, as well as quasi-continuously controlled process behavior in the time domain and quasi-continuously controlled process behavior in the phase plane. The text is a vital source of data for researchers interested in the fundamentals of temperature control.

1

THERMAL-PROCESS REPRESENTATION

Publisher Summary

This chapter presents thermal processing which is the addition or subtraction of heat from a quantity of matter. As an example of a common thermal process, consider the familiar mercury-in-glass thermometer. The properties of this process are those of the glass, the mercury, and any film on the outside of the glass or between the glass and the mercury. The input into the process could be the temperature of the medium in which the thermometer bulb is immersed. The response is a number of quantities according to the purpose of the process. If the purpose is to regulate temperature, then the response is the position of the end of the mercury column, and temperature regulation is achieved by an electrical circuit being completed by this column. Then, to the properties of the process, the accuracy of the bore of the capillary tube is added. If the purpose is to indicate temperature, a further property of the process must be included—the accuracy of the marking on the outside of the glass tube—and the indicated temperature becomes the response.

Thermal processing is the addition or subtraction of heat from a quantity of matter (solid, liquid, or gas). As an example of a common thermal process, consider the familiar mercury-in-glass thermometer. The properties of this process are those of the glass, the mercury, and any film (such as dirt) on the outside of the glass or between the glass and the mercury. The input into the process could be the temperature of the medium in which the thermometer bulb is immersed. The response could be a number of quantities according to the purpose of the process. If the purpose is to regulate temperature, then the response could be the position of the end of t...

Table of contents

• Cover image
• Title page
• Table of Contents
• Copyright
• Dedication
• PREFACE
• NOMENCLATURE
• Chapter 1: THERMAL-PROCESS REPRESENTATION
• Chapter 2: THERMAL-PROCESS RESPONSE
• Chapter 3: COMMON THERMAL ELEMENTS
• Chapter 4: OPEN-LOOP TEMPERATURE CONTROL
• Chapter 5: CLOSED-LOOP TEMPERATURE CONTROL
• Chapter 6: DYNAMICS OF DISCONTINUOUS TEMPERATURE CONTROL
• Chapter 7: QUASI-CONTINUOUS AND CONTINUOUS TEMPERATURE CONTROL
• APPENDICES
• BIBLIOGRAPHY
• AUTHOR INDEX
• SUBJECT INDEX