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Heat Exchanger Engineering Techniques: Process, Air Conditioning, and Electronic Systems

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Heat Exchanger Engineering Techniques: Process, Air Conditioning, and Electronic Systems, ISBN-13: 978-0791801673

[PDF eBook eTextbook]

 

  • 335 pages
  • Publisher: American Society Of Mechanical Engineers, 2003 Edition
  • Language: English
  • ISBN-10: 0791801675
  • ISBN-13: 978-0791801673

 

The techniques of selecting heat transfer equipment for process, power, industry, air conditioning, and cooling of electronics are mature ones. Plenty of data about these are available in the literature. Professional organizations, industrial companies, and equipment manufacturers have tested many kinds of equipment including upgraded designs to improve product performance. Engineering societies have developed standards, data sheets, and construction details for various designs. To help in making a selection, the thermal properties of most fluids are known or are available. Computer programs have been developed to improve the quality and speed of the selection process. Industry has, in general, reached the point where it is rare that an inadequate heat exchanger is selected. It is not the intent of this writing to challenge the existing data and methodology in any way.

Once a unit has been selected it must be built, assembled, shipped, and installed. At the same time it must meet other criteria such as energy usage, noise, ease of cleaning, weight, flow distribution, and others. It is these criteria that this book addresses. Many examples given, particularly those of requirements omitted from specifications, are well known to some construction companies, as they have faced these kinds of problems previously. These problems are included in this work because they are not common knowledge in all companies.

One purpose of this book is to inform users of conditions that have caused failures on other projects and to give guidance on how they can be avoided on future projects—thus, to assist users in making better selections and to inform them of the limits of other designs. The contents are a cross section of problems that have occurred during the author’s 46-year career.

Some points require clarification. The author’s experience is that roughly 1 selection in 25 is a poor choice in terms of construction. Further, the correction will usually not be the best solution but only the expedient one.

Few engineers possess the skills to rate all types of heat exchangers. The best design and construction is apt to be overlooked. Also, locating the source of a problem, once it occurs, is not easy and is far more time-consuming, on average, than sizing a unit. Locating the source of a problem usually cannot be done sitting behind a desk.

Even though most exchangers selected are thermally correct, many have not been the best choice for an application. This has resulted in field problems of one kind or another. The intent is to identify problems that occur and suggest ways of preventing their happening again. Hence, this effort addresses such factors as shipping, handling, installation, and servicing that can be simplified by thinking through the various aspects of a problem. To do this, information has been gathered in this book to assist personnel when facing problems similar to these:

1. Nonperformance is often caused by the omission of a requirement from the specifications. Examples are given.

2. Ways of altering an exchanger’s geometry to make better use of space are given.

3. Ways to improve handling, maintenance, and cost are identified.

4. Conditions that reduce an exchanger’s thermal capacity are described. Hints are provided on how to locate the source of the problem.

5. Reasons are given why some constructions should be avoided on certain applications.

6. A primary goal is to aid personnel (rater, checker, inspector, salesperson) in identifying requirements. Several ways of doing this are included.

This book assumes the reader has some knowledge of how to size heat transfer equipment or can obtain the information from reputable manufacturers or sources. The purpose is to build on this knowledge and identify for user, manufacturer, and student other kinds of information needed to make a good selection. The book also includes conditions to avoid in order to have smoother operating, more economical, and near trouble-free installations.

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