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Reflective Changes in ASHRAE 90.1-2010 Proposed in USGBC Conference Held in Philadelphia

Posted by: Bhushan Avastthi | Posted on: November 27th, 2013

The legacy of green building continued this year while USGBC U.S Green Building Council’s Green build International conference and Expo – celebrated its 20th Anniversary with a conference reflecting on the concept of green building. Industry leaders, experts and frontline experts relating to sustainable buildings participated to discuss the evolving green building technologies, the ones that were proposed at ASHRAE 90.1-2010 the three daylong conference. We dedicate this article to welcome these changes over existing norms.

Reflective Changes in ASHRAE 90

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Enlisted are a few of the major changes that reflected in the USGBC conference:

  • Energy efficiency was prominently the focus; ASHRAE 90.1-2010 enhanced it by 5% ultimately reducing the LEED points as compared to earlier version. It is a clear indication that buildings once rated as Silver now stand the chance to get certified as per ASHRAE standards.
  • History of building technologies was marked with a milestone when Haworth Building of Beijing was certified with gold rating – the first of its kind at interior building category.
  • Capital tower in Houston is already pre certified for LEED V4 version.
  • Water efficiency: evolving logic built up the new version with enhanced credits for buildings that are water efficient

Some of the other important changes in ASHRAE 90.1-2010 include:

  • Increasing number of equipments including computer loads, elevators, escalators, fast walks, and domestic water booster pumps are being regulated. These are some of the commendable energy efficient steps that ASHRAE implemented to improve green buildings.
  • Skylight or Clerestories is given considerable importance for large, top floor rooms covering more than 10,000 sq. feet area or top floor rooms, which are directly under a roof with a ceiling height of over 15 ft. These changes were prescribed based on a concept that Skylights facing north save more energy.
  • Observing reheat wherever loopholes are closed was emphasized. It clearly indicates that hospitals will not be allowed a constant volume of reheat unless the peak flow of the energy is less than 30% or 25% / 50%. Exceptional cases where in case 75% of the heat is recovered; ORs should be pressurized when unoccupied.
  • It is noteworthy that 2012 IECC norm is less restrictive except the fact that 30% exception should not be deleted.
  • Lighting control should be observed through astronomical timing or daylight sensor while exterior lighting should be turned off when sufficient day light is available. As far as façade and landscape lighting are concerned they should be turned off from midnight or closing to 6 am.
  • Higher LPD (Low Power Device) is allowed with control i.e., 5%-10% where it is necessary to conduct functional testing. The whole building off may be required with some exceptions.

About Author:

Bhushan Avsatthi

Bhushan Avsatthi is a senior manager, consultant, BIM expert and a green building advisor with more than 15 years of industry experience. Bhushan imbibes the prophecy of efficient and prudent use of energy in his day to day life and advices his team to do so as well. He is also involved in green initiatives like nonprofit tree plantation project and promotes using cycles for commuting small distances. Bhushan, handles a team of architects, Structural and MEP engineers, LEED consultants and Energy modeling experts.