Principles of Heating, Ventilating, and Air Conditioning is a textbook based on the 2009 ASHRAE Handbook"Fundamentals. It contains the most current ASHRAE procedures and definitive, yet easy to understand, treatment of building HVAC systems, from basic principles through design and operation.It is suitable both as a textbook and as a reference book for undergraduate engineering courses in the field of air conditioning, heating, and ventilation; for similar courses at technical and vocational schools; for continuing education and refresher short courses for engineers; and for adult education courses for professionals other than engineers, especially when combined with 2009 ASHRAE Handbook"Fundamentals.The material is divided into three major sections: General Concepts, Chapters 1"10; Air-Conditioning Systems, Chapters 11"16; and HVAC&R Equipment, Chapters 17"19. There are several significant changes in this revised edition. Chapter 4 has a new format as well as new values for climatic design information. Chapter 5 has a new table for typical thermal properties (resistance and thermal conductivity) of common building and insulating materials. This includes new values of heating, wind, cooling, and dehumidifying design conditions. Chapter 6 has been extensively revised with new design data. In addition, the chapters on system design and equipment have been significantly revised to reflect recent changes and concepts in modern heating and air-conditioning system practices. A new chapter, 20 - Heat Exchange Equipment, gives more details on heat exchanger design.