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เนื้อหาย่อ : The health, welfare, comfort and productivity of nations are interw developments in both the refrigeration and alr-conditioning fields. Refrigeration is essential for the preservation of foods, the production and sate storage of medicines, and the like. Equally impor rtant, through refrigeration better controls of industrial processes are possible. Dimensional accuracy is improved, new materials may be developed and processed, and other production processes may be inereased. As significant and as complex as this range of applications may be, the major units which together constitute a refrigeration n or an air-conditioning system all depend on fundamental scientific principles. It is the objective of this instructional material to present these basic principles. Acknowledgment is made to Amos H. Keirn, Senior Laboratory Engineer, Fedders Corp., Buffalo, N. Y, and Robert L. Jameson, Sales Manager, Buffalo Branch, Minneapolis Honeywell Regulator Company for technical advice; to Norma K. Pittard and Louis J. Siy for original artwork; and to the Editorial Staff of Delmar Publishers, Inc., for assistance in preparing the manuseript for publication. Credit for the important work of technical editing is due Vincent P. Lang, Technical Editor, Carrier Corporation, Syracuse, N. Y., for his unusual skill in checking for technical accuracy and the up-to-date nature of the processes, systems, supplies and accessories which are covered in this book. Grateful appreciation is expressed to William G. Dickson, Editor, Delmar Publishers, Inc., for his continuous enco ouragement and guidance at each successive step from planning through to the production of this publication. Realizing the important parts which others behind the scenes play through patient understanding and encour uragement, the authors early agreed to dedicate this publication to their respective famllies. Thanks go to each one for the individual con- tribution made that this work might be carrled through to completion at this early date.