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LEED has approved the use of addenda to A90.1-2004 so Addendum 'ac' can be applied. The change to the Appendix G fan power formula was not included in an addendum because it occurred while 90.1 was still considered 'informative,' not 'normative,' as the currently proposed Addendum 'r' to A90.1-2007 is proposing to change. I believe the change to the fan power formula, however, was approved by LEED in a CIR, so you should be able to apply the new formula and pressure credits for the Appendix G PRM.
Bill
Bill Talbert, PE, LEED® AP
Mechanical Systems Phone: (608) 441-6677 E-mail: btalbert@xxxxxxxxxx Affiliated Engineers Inc. 5802 Research Park Blvd. Madison, WI. 53719 Tel. (608) 238-2616 Fax. (608) 238-2614 >>> "Baker, Kristopher" <kbaker@xxxxxxxxx> 10/25/2007 10:47 AM >>> Any ideas if we can apply the new methodology, indicated in either Addenda ac for the 2004 version or addenda r for the 2007 version, to the Appendix G Performance Rating Method? KB Kristopher S. Baker, PE LEED(r) Accredited Professional Associate Senior Sustainability Specialist - Sustainable Design & High Performance Building Technology Syska Hennessy Group, Inc. Tel: 703.629.8028 Direct Fax: 866.885.5621 Email: kbaker@xxxxxxxxx http://www.syska.com P Please consider the environment before printing this e-mail ________________________________ This email and any files transmitted with it are the property of Syska Hennessy Group and are intended solely for the use of the individual or entity to which they are addressed. The information contained herein may include trade secrets or privileged or otherwise confidential information and unauthorized review, forwarding, printing, distributing, or using such information is strictly prohibited and may be unlawful. If you received this message in error, or have reason to believe you are not authorized to receive it, please promptly delete this message and notify the sender by e-mail. ________________________________ -----Original Message----- From: BLDG-SIM@xxxxxxxx [mailto:BLDG-SIM@xxxxxxxx] On Behalf Of Michael Rosenberg Sent: Wednesday, October 24, 2007 10:03 PM To: BLDG-SIM@xxxxxxxx Cc: sferguson@xxxxxxxxxxx Subject: [BLDG-SIM] New Calculation method for Baseline Fan Energyin Addendum R Mike and Andrew, That is Addendum R that Andrew is referring to. It is actually Addendum R to 90.1, 2007. Even though 2007 has not been published yet, ASHRAE is already up to Addendum R. As for the calculation, Andrew made a good catch. It is a typo and should read CFM x 0.00094 + A and CFM x 0.0013 + A. Mike Michael Rosenberg Oregon Department of Energy 625 Marion St. N.E. Salem, OR 97301-3742 Phone : (503) 373-7809 Fax: (503) 373-7806 >>> "Michael Tillou" <michael.tillou@xxxxxxxxx> 10/24/2007 11:39:01 AM >>> I think you mean to be referencing ASHRAE 90.1-2004 addendum ac not addendum r which includes two new methods for calculating fan power limits. The first looks at total Motor HP which isn't very useful for energy modeling purposes and the second looks at fan brake-horsepower. The fan brake-horsepower equations are "(CFM x 0.00094) + A" and "(CFM x 0.0013) + A" for constant volume and variable volume systems respectively. CFM is the design airflow rate and A is the brakehorse power adjustement for various pressure drop adjustments given in Table 6.5.3.1.1B. Mike Michael Tillou, PE, LEED Tillou Engineering, LLC Williamstown, MA 01267 P: 413-458-9870 C: 413-652-1087 _____ From: BLDG-SIM@xxxxxxxx [mailto:BLDG-SIM@xxxxxxxx] On Behalf Of Andrew Craig Sent: Wednesday, October 24, 2007 11:56 AM To: BLDG-SIM@xxxxxxxx Subject: [BLDG-SIM] New Calculation method for Baseline Fan Energy in Addendum R I was wondering if anyone out there can explain the new calculation shown for baseline fan brake horsepower in Table G3.1.2.9 of Addendum R to ASHRAE 90.1-2004? At first glance, the equation doesn't make sense because you are subtracting a relatively small number (0.0013+A) from a large number (CFMs) leaving you with a ridiculously large baseline fan motor brake horsepower. Am I just reading this wrong or is there a typo? Isn't there an easier way out there to calculate baseline fan energy (please see version 1 of Appendix G for another confusing calculation)? Andrew Craig, EIT, LEEDR AP | Mechanical Designer INTERFACE ENGINEERING 708 SW Third Avenue | Suite 400 | Portland, OR 97204 direct: 503.382.2696 office: 503.382.2266 fax: 503.382.2262 email: Andrew_C@xxxxxxxxx web: www.ieice.com Consultants of Choice to the Built Environment for over 35 years Kirkland, WA | Portland, OR | Sacramento, CA | Salem, OR | SanFrancisco, CA ================== You received this e-mail because you are subscribed to the BLDG-SIM@xxxxxxxx mailing list. To unsubscribe from this mailing list send a blank message to BLDG-SIM-UNSUBSCRIBE@xxxxxxxx ====================================================== You received this e-mail because you are subscribed to the BLDG-SIM@xxxxxxxx mailing list. To unsubscribe from this mailing list send a blank message to BLDG-SIM-UNSUBSCRIBE@xxxxxxxx ================== You received this e-mail because you are subscribed to the BLDG-SIM@xxxxxxxx mailing list. 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