Ashrae Journal - October 2008 - (Page 48) Addendum Subject Comments Estimated Savings (* Denotes According to the Foreword) E Energy Recovery Expands the requirement for outdoor air energy recovery. In response to continuous maintenance proposals, adds a number of roof types available to be used. * “…4.74 quads of primary energy over 28 years (2007 to 2035). In terms of cumulative electric site energy savings, that is roughly equivalent to 596 billion kWh over 28 years, or 21.3 billion kWh per year.” F Ballasted, Vented, And “Cool” Roofs O Transformers Adds federal requirements for transformers. R Make Appendix G A Normative Reference Appendix G defines modeling requirements for buildings “intended for use in rating the energy efficiency of the building designs that exceed the requirements of this standard.” Appendix G is used by USGBC for LEED energy cost savings estimates. AB Expansion Of Addendum D Daylighting requirements. Preliminary estimates of the effect of Addendum D and AB are an 8.8% reduction of lighting energy across all building types. AF Pipe Sizing Defines minimum pipe sizes by flow rate. Reduces threshold for efficient part load pumping to pumps exceeding 5 hp. Established requirement for “critical valve reset” for DDC systems. Significant AK Hydronic Variable Flow Systems Significant AL Skylights Requirements in large enclosed spaces. If Title, Purpose, and Scope recommendations are accepted and the standard is applied to lighting in unheated warehouses, it is estimated that for each year of construction, 160 GWh will be saved. Table 3: Selected proposed addenda presently in the public review process. publication. Because IESNA is a cosponsor of 90.1, approval by its Board of Directors is also required. Work Plan Goals Immediate Plans for the Standard Supplement to 90.1-2007 In the Work Plan adopted unanimously by the SSPC in June 2007, the goal is: “A 2010 standard that results in 30% total energy-cost savings improvement compared to 90.1-2004.” The overall goal is national average based on aggregate construction and climate-weighted energy cost savings and may not be achieved for every building type in every climate. Energy cost is the agreed upon normalized metric, and is used as a surrogate for environmental emissions. 48 ASHRAE Journal Since the publication of 90.1-2007, SSPC 90.1 and all levels of ASHRAE have approved a number of addenda. Every 18 months, ASHRAE collects those addenda that have been approved and issues a supplement to the standard. A list of those addenda already approved is provided in Table 1. Note that there is no “official” subject for these items; the subjects in the table are general titles used here to organize the addenda. Also included for some addenda are estimated savings according to the foreword of the addendum. The addenda that are likely to help save significant energy cost include: ashrae.org October 2008 http://www.ashrae.org
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