Ashrae Journal - October 2008 - (Page 45) Addendum Subject Cooling Tower Clarification Vivariums Vivariums Metal Buildings Comments The standard did not cover closed circuit cooling towers, but this was not obvious to users. Changes made to address issues of vivaria with respect to fan power requirements. Additional changes in response to public input. Insulation requirements updates. To allow ASHRAE Standards 55, 62.1, and 90.1 to be used in conjunction more easily, this addendum revises the airflow limits for which new energy may be used for reheating or recooling in DDC systems. Estimated Savings (* Denotes According to the Foreword) A B C G H VAV Zone Controls *“…about $0.20/ft2/yr with a simple payback of less than 2 years.” I Exterior Lighting Categories for external lighting allowances were expanded and lighting power densities defined. *Varies by exterior lighting zone and square footage. For a 15,000 ft2 area, savings are from 16% to 50% of exterior lighting power. J K L Mechanical References Furnaces Closed-Circuit Cooling Towers References updated. Clarifies warm air furnace and duct furnace references. Efficiency requirements added for closed circuit cooling towers—this was a continuation of Addendum A. Establishes requirements for single zone VAV systems and fan modulation on DX units above 110,000 Btu/h on Jan. 1, 2012. Added pressure drop allowances for laboratory exhaust fans. Added the requirement for vestibules to Climate Zone 4 (near the Mason-Dixon Line). Establishes ARI 1160 as the test procedure for heat pump pool heaters and requires that the minimum coefficient of performance (COP) of 4 be met at the low outdoor temperature of 50°F (instead of the high outdoor temperature of 80°F currently required). Incentives added. Added a new reference for liquid-to-liquid heat exchangers. * “…significantly increase the stringency of Standard 90.1 as heat pump pool heaters will now be required to deliver a COP of 4 at a higher temperature lift.” N Single-Zone VAV Significant, but not estimated. P Q Lab Exhaust Fans Vestibules Y Heat Pump Pool Heaters AC AD Lighting Control Incentives Liquid to Liquid Heat Exchangers Table 1: Addenda slated for inclusion in the Supplement to 90.1-2007. (See Page 48 for a discussion of the 2007 Supplement.) site version of Standard 90.1 by specific percentages. The basis of demonstrating this performance is the Performance Rating Method detailed in Appendix G of Standard 90.1. The Green Buildings Initiative has developed the Green Globes™ building rating system, which requires compliance with—and in some cases, exceeding—the requirements of Standard 90.1. October 2008 Membership The Standard 90.1 committee is a standing standards project committee (SSPC), which means that it is not disbanded once the standard is published. The committee, comprised of volunteers with assistance from ASHRAE staff, performs the bulk of the work developing and ASHRAE Journal 45
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