ASHRAE - American Society of Heating@ Refrigerating and Air-Conditioning Engineers@ Inc.
Scope
Preface to the Second Edition To the casual observer@ the need for a new load calculation manual may not be self-evident. Yet@ changes in lighting and equipment commonly used in buildings require new data@ new methods that are more widely applicable have become available@ and other newer data have become available since the first edition was originally published in 2008. These new data and methods have been produced by ASHRAEfunded research and by volunteers working on ASHRAE technical committees (TCs). These effort include the following: ? TC 4.1@ Load Calculation Data and Procedures@ and their contractors (RP-1482) have produced new internal heat gain data for office equipment. ? TC 4.1 and TC 4.5@ Fenestration@ and their contractors (RP-1311) have developed new methods and data for computing the effects of internal shading on solar heat gains. ? TC 4.1 and TC 5.10@ Kitchen Ventilation@ and their contractors (RP-1326) have produced a complete new data set on heat gains from kitchen equipment based on experimental measurements. ? TC 4.2@ Climatic Information@ and their contractors have produced new weather data (RP-1613) for over 6000 stations worldwide based on the years 1986?C2010. TC 4.2 also produced a new ASHRAE clear-sky model (RP-1453) that is applicable worldwide??a significant improvement over the old model@ which was only valid for the continental United States. TC 4.2 has also developed improved methods (RP-1363) for generating design day temperature profiles. ? TC 4.4@ Building Materials and Building Envelope Performance@ has provided a major revision of the building thermal properties data. In addition to acknowledging the members of the above technical committees and their contractors@ I would also like to thank the members of the Project Monitoring Subcommittee who have overseen this work: Steve Bruning@ Jim Pegues@ Bob Doeffinger@ Larry Sun@ and ChrisWilkins. Their oversight and suggestions have been invaluable. I have been assisted on this project by three students at Oklahoma State University: a graduate student@ Laura Southard@ and two undergraduate students@ Jimmy Kim and Amy Wong@ who have helped with developing revised examples and source code for the changes to the accompanying spreadsheets. Putting together this book from a set of the author's Word files was a big task requiring quite a bit of attention to detail. I greatly appreciate the work of the ASHRAE staff@ especially Sarah Boyle@ assistant editor of Special Publications@ in editing and typesetting the book. Cindy Michaels@ Managing editor of Special Publications@ was also very helpful in getting me access to handbook chapters as soon as they became available. Thanks to both of you! I would like to take the author's prerogative to note three longtime ASHRAE TC 4.1 members who passed away during 2011 and 2012. Lynn G. Bellenger was not only an active TC 4.1 member@ but very active in all areas of ASHRAE@ serving as the first female ASHRAE President in 2010 and 2011. Lynn was an encouragement to many society members. Two other TC 4.1 stalwarts@ Thomas B. Romine@ Jr. and Curtis O. Pedersen@ both passed away in July of 2012. Tom was a consulting engineer in Fort Worth@ Texas who ably represented the viewpoint of the consulting engineer on the technical committee and helped me keep the end user in mind when I was working on some of the earlier load calculation manuals. Curt was a professor at the University of Illinois at Urbana-Champaign@ my PhD advisor@ an investigator on several load calculationrelated research projects@ and proponent of using fundamental methods??i.e.@ the heat balance method??for load calculations. Both men have had a great impact on the load calculation methodologies presented in this book.