ASHRAE Journal - November 2009 - 3

CONTENTS B19 B24 Vol. 51, No. 11 | November 2009 Features 16 Upgrading Chilled-Water Systems By Mick Schwedler, P.E., Beth Bakkum 34 50th anniversary feature By Gurvinder Singh, John W. Mitchell, Ph.D., P.E. Standing Columns 46 Building Sciences Advanced Framing By Joseph W. Lstiburek, Ph.D., P .Eng. Energy Savings From Pump Impeller Trimming 65 66 70 74 5 6 8 14 68 72 75 76 80 Technical Topics GSHPs: Simple Is Better By Steve Kavanaugh, Ph.D. Washington Report By Ryan M. Colker BACnet® TodayBACnet and the Smart Grid By David G. Holmberg, Ph.D., Steven T. Bushby Senate Working on Climate Legislation Emerging Technologies B14 B19 B24 B28 An Untangled Web How BACnet Is Connecting at ASHRAE’s Headquarters By Steve Tom, Ph.D., P .E. By John Dieckmann, Kurtis McKenney, James Brodrick, Ph.D. Radiant Floor Cooling in Practice Research Topics Visualizing BACnet By Roland Laird By Tim Davis By Martin Burke, Larry Wong, Gerhard Knutson, Ph.D. Using N2O as Tracer Gas BACnet & Trigeneration BACnet Gets Smaller By David Fisher Departments Commentary Industry News Letters Meetings and Shows Special Products People Products Classified Advertising Advertisers Index Special Section 54 InfoCenter ASHRAE® Journal (ISSN 0001-2491) MISSION STATEMENT | ASHRAE Journal reviews current HVAC&R technology of broad interest through publication of application-oriented articles. ASHRAE Journal’s editorial content ranges from back-to-basics features to reviews of emerging technologies, covering the entire spectrum of professional interest from design and construction practices to commissioning and the service life of HVAC&R environmental systems. PUBLISHED MONTHLY | Copyright 2009 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., 1791 Tullie Circle N.E., Atlanta, GA 30329. Periodicals postage paid at Atlanta, Georgia, and additional mailing offices. LETTERS/MANUSCRIPTS | Letters to the editor and manuscripts for publication should be sent to: Fred Turner, Editor, ASHRAE Journal, fturner@ashrae.org. SUBSCRIPTIONS | $8 per single copy (includes postage and handling on mail orders). Subscriptions for members $6 per year, included with annual dues, not deductible. Nonmember $59 (includes postage in USA); $79 (includes postage for Canadian); $149 international (includes air mail). Expiration dates vary for both member and nonmember subscriptions. Payment (U.S. funds) required with all orders. CHANGE OF ADDRESS | Requests must be received at subscription office eight weeks before effective date. Send both old and new addresses for the change. ASHRAE members may submit address changes at www.ashrae.org/address. POSTMASTER | Send form 3579 to: ASHRAE Journal, 1791 Tullie Circle N.E., Atlanta, GA 30329. Canadian Agreement Number 40064709. ONLINE at ASHRAE.org | Feature articles are available online. Members can access articles at no cost. Nonmembers may purchase articles at www.ashrae.org/bookstore. | CUSTOM ARTICLE REPRINTS | Reprints are available from The YGS Group, call 800-290-5460 or Email ASHRAEreprints@theYGSgroup.com. MICROFILM | This publication is microfilmed by National Archive Publishing Company. For information on cost and issues available, contact NAPC at 800-420-NAPC or www.napubco.com. PUBLICATION DISCLAIMER | ASHRAE has compiled this publication with care, but ASHRAE has not investigated and ASHRAE expressly disclaims any duty to investigate any product, service, process, procedure, design or the like which may be described herein. The appearance of any technical data, editorial material or advertisement in this publication does not constitute endorsement, warranty or guarantee by ASHRAE of any product, service, process, procedure, design or the like. ASHRAE does not warrant that the information in this publication is free of errors and ASHRAE does not necessarily agree with any statement or opinion in this publication. The entire risk of the use of any information in this publication and its supplement is assumed by the user.

ASHRAE Journal - November 2009

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