Preface The 2009 ASHRAE Handbook??Fundamentals covers basic principles and data used in the HVACR industry. The ASHRAE Technical Committees that prepare these chapters strive not only to provide new information@ but also to clarify existing information@ delete obsolete materials@ and reorganize chapters to make the Handbook more understandable and easier to use. An accompanying CDROM contains all the volume's chapters in both I-P and SI units. This edition includes a new chapter (35)@ Sustainability@ which defines this concept for HVACR and describes the principles@ design considerations@ and detailed evaluations needed in designing sustainable HVACR systems.