2012 Addenda Supplement to Standard 90.1-2010 - ashrae

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© ASHRAE (www.ashrae.org). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE's prior written permission. (This foreword is not part of this standard. It is merely informative and does not contain requirements necessary for conformance to the standard. It has not been processed according to the ANSI requirements for a standard and may contain material that has not been subject to public review or a consensus process. Unresolved objectors on informative material are not offered the right to appeal at ASHRAE or ANSI.) FOREWORD The 2010 edition of the ASME Safety Code for Elevators and Escalators added allowances to permit varying the speed of escalators and moving walks to conserve energy. It does not yet permit automatically stopping and starting of escalators or moving walks. Variable-speed technology is common for this application in other countries. Note: In this addendum, changes to the current standard are indicated in the text by underlining (for additions) and strikethrough (for deletions) unless the instructions specifically mention some other means of indicating the changes. Addendum b to Standard 90.1-2010 Revise the standard as follows (I-P and SI units): 10.4.4 Escalators and Moving Walks. Escalators and moving walks shall automatically slow to the minimum permitted speed in accordance with ASME A17.1/CSA B44 or applicable local code, when not conveying passengers. 12. NORMATIVE REFERENCES American Society of Mechanical Engineers, ASME, Three Park Avenue, New York, NY 10016-5990 ASME A17.1-2010/CSA B44-10 Safety Code for Elevators and Escalators 4 ANSI/ASHRAE/IES Addendum b to ANSI/ASHRAE/IES Standard 90.1-2010
© ASHRAE (www.ashrae.org). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE's prior written permission. (This foreword is not part of this standard. It is merely informative and does not contain requirements necessary for conformance to the standard. It has not been processed according to the ANSI requirements for a standard and may contain material that has not been subject to public review or a consensus process. Unresolved objectors on informative material are not offered the right to appeal at ASHRAE or ANSI.) FOREWORD The treatment of laboratory exhaust fans is currently not specified. Laboratory exhaust design requires sufficient momentum of exhaust volume to exit the building wake in order to prevent re-entrainment of exhaust air. The standard design approach to accomplish this for VAV supply systems utilizes an outdoor air bypass damper that ensures a constant volume stack discharge (brings in outdoor air to supplement any decrease in exhaust volume from the building). Clarifying this as the baseline approach will make it clear to design teams that other approaches considered to be energy reduction strategies will be acknowledged as such and appropriately credited. Note: In this addendum, changes to the current standard are indicated in the text by underlining (for additions) and strikethrough (for deletions) unless the instructions specifically mention some other means of indicating the changes. Addendum c to Standard 90.1-2010 Revise the standard as follows (I-P and SI units): G3.1.1 Baseline HVAC System Type and Description. HVAC systems in the baseline building design shall be based on usage, number of floors, conditioned floor area, and heating source as specified in Table G3.1.1A and shall conform with the system descriptions in Table G3.1.1B. For systems 1, 2, 3, and 4, each thermal block shall be modeled with its own HVAC system. For systems 5, 6, 7, 8, 9, and 10 each floor shall be modeled with a separate HVAC system. Floors with identical thermal blocks can be grouped for modeling purposes. Exceptions: a. Use additional system type(s) for nonpredominant conditions (i.e., residential/nonresidential or heating source) if those conditions apply to more than 20,000 ft 2 (1900 m 2 ) of conditioned floor area. b. If the baseline HVAC system type is 5, 6, 7, 8, 9, or 10 use separate single-zone systems conforming with the requirements of System 3 or System 4 (depending on building heating source) for any spaces that have occupancy or process loads or schedules that differ significantly from the rest of the building. Peak thermal loads that differ by 10 Btu/hft 2 (31.2 W/m 2 ) or more from the average of other spaces served by the system or schedules that differ by more than 40 equivalent full-load hours per week from other spaces served by the system are considered to differ significantly. Examples where this exception may be applicable include, but are not limited to, computer server rooms, natatoriums, and continually occupied security areas. c. For laboratory spaces in a building having a total laboratory exhaust rate greater than 5000 cfm (2400 L/s), use a single system of type 5 or 7 serving only those spaces. For all-electric buildings, the heating shall be electric resistance. The lab exhaust fan shall be modeled as constant horsepower reflecting constant volume stack discharge with outdoor air bypass. ANSI/ASHRAE/IES Addendum c to ANSI/ASHRAE/IES Standard 90.1-2010 5
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2012 Addenda Supplement to Standard 90.1-2010 - ashrae

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