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Page d'accueil ICHMT DL Année en cours Archives Comité de direction Centre international pour le transfert de chaleur et de masse

Preface

Jerry Taborek
Consultant, 260 Lake Drive, Sedona, Arizona 86336, USA; Alhambra, California Heat Transfer Research, Inc. (HTRI)

Geoffrey F. Hewitt
Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK

Naim Hamdia Afgan
Instituto Superior Técnico, Lisbon, Portugal

Résumé

Heat exchange equipment forms a vital part of many processes-chemical, petroleum, power generation, refrigeration, and so on. This equipment has always been of great industrial importance, but, in recent years, its significance has increased even more because of the energy crisis. It is imperative to make the best possible use of energy resources, and the conservation and reuse of thermal energy through the utilization of heat exchangers is critical in these endeavors. Thermal energy is more useful the higher its temperature. Thus, in recycling thermal energy, there is considerable emphasis on the minimization of temperature differences to reduce irreversibilities in the processes.
It was with this in mind that the subject of Advancement in Heat Exchangers was chosen for the 1981 Seminar of the International Centre for Heat and Mass Transfer. The seminars form an important focus for work on heat and mass transfer on a truly international basis. This latter point is illustrated by the fact that there were no fewer than 26 countries represented at the 1981 Seminar, reflecting the importance of the field.
In inviting lectures and soliciting papers for the 1981 seminar, the topics chosen represented a large spectrum of heat exchanger applications in industry. The seminar covered not only well established areas, but also new techniques and applications that are still in the early stages of development; for example, heat transfer equipment for coal conversion processes where the thermal energy recovery from such processes is a key to their economic acceptance. Among the new techniques discussed at the conference were the use of special types of ceramic heat exchangers, new forms of heat transfer enhancement, and the utilization of very small temperature difference processes as in cryogenic heat exchangers. A great deal of new information arose from the conference and selected material is presented in this volume. The material given is of two main types:

  1. State-of-the-art survey articles. These were usually in the form of invited lectures and covered a wide range of topics in areas where current development is particularly dynamic. These survey articles will be of considerable use to those wishing an overview of the subject.
  2. General papers. Around 70 papers were presented at the symposium based on original research. In selecting papers from this group for the present volume, emphasis has been given to those that are closest to practical application or have information on new developments that are likely to be significant in the field of heat exchangers in the future. A great deal of original research is reported in the present volume, which should serve as a major archival source in years to come.
In view of the closeness to practical application of the material in this volume, and the broadness of the subjects covered, we feel that the volume will be extremely valuable to all those involved in the design and operation of heat transfer equipment. However, as such is the breadth of the field, no volume of the present sort could claim to cover everything.
The editors would like to express their thanks to all those who helped to make the 1981 Seminar successful. First, we express our thanks to the staff of the International Centre for all the organizational work they carried out. Next, we would like to thank the members of the Seminar Committee and the Chairmen of the various technical sessions whose help in soliciting papers and evaluating the material was essential and invaluable. We also have appreciated very much the assistance from the publisher and his key staff in handling the manuscript material. Also, we would like to thank our own secretarial staff who have done a most competent job throughout the task of organizing the Seminar. Last but not least, we thank all the invited lecturers and authors without whose excellent material this Seminar, and hence this volume, would not have been possible.

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