Control Systems for Heating, Ventilating and Air Conditioning
There are two reasons why we have a new edition every four or five years. The first is that technology changes. Chapter 10, on computer-based con trols, has had to be almost completely rewritten. Fundamentals don't change, but the tools available to us d
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Control Systams lor Haating, Vantilating and Air Conditioning Fourth Edition
ROger W. Haines Consulting Engineer
rt7m5l VAN NOSTRAND REINHOLD ~ _ _ _ New York
ISBN -13 :978-1-4684-6595-2 DOT: 10.1007/978-1-4684-6593-8
e-ISBN -13 :978-1-4684-6593-8
Softcover reprint of the hardcover I st edition 1987
Copyright © 1987 by Van Nostrand Reinhold Library of Congress Catalog Card Number 87-2144 All rights reserved. Certain portions of this work © 1983, 1977, 1971 by Van Nostrand Reinhold Company Inc. No part of this work covered by the copyright hereon may be reproduced or used in any form or by any means-graphic, electronic, or mechanical, including photocopying, recording, taping, or information storage and retrieval systems-without written permission of the publisher.
Van Nostrand Reinhold 115 Fifth Avenue New Yorlc, New York 10003 Chapman & Hall 2-6 Boundary Row London SEI 8HN, England Thomas Nelson Australia 102 Dodds Street South Melbourne, Victoria 3205, Australia Nelson Canada 1120 Birchmount Road Scarborough, Ontario MIK 5G4, Canada 16 15 14 13 12 11 10 9 8 7 6 5
Library of Congress Cataloging-in-Publication Data Haines, Roger W. Control systems for heating, ventilating, and air conditioning. Bibliography: p. Includes index. 1. Heating-Control. I. Title. TH7466.5H34 1987
2. Air conditioning-Control. 697
87-2144
Preface to the Fourth Edition
There are two reasons why we have a new edition every four or five years. The first is that technology changes. Chapter 10, on computer-based controls, has had to be almost completely rewritten. Fundamentals don't change, but the tools available to us do change. Evaluation and proper use of those tools makes it even more imperative that we understand fundamentals. Many of our control problems stem from the use of new devices as a solution to problems that are, in fact, control design errors. New gadgets, for example, Direct Digital Controls (DDC), will not solve basic problems and may even compound them. None-the-Iess, you will find an extensive discussion of DDC because I think it is the probable "future" in HVAC control. But it must be applied with a good understanding of fundamentals. The second reason is that I keep learning and need to pass on my new and improved understanding to my readers. Thus you will find a number of small but important revisions, a dissertation on control "modes," and a much more detailed discussion of how electronic control devices work. There are a few places where I have corrected what I now perceive to be errors. I apologize for these. I have been much encouraged by the acceptance of this book in the past, and I hope that this new edition will be helpful. Thank you for your support. Roger W. Haines
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Preface to the First Edition
This book is intended for the guidance of the engineer who is designing a heating, ventilating or air conditioning system and wants a simple, practical explanation of how best to control that system. It could also be used as a supplemental text in a college or technical school course on refrigeration a
