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Comments Close Soon for Updated ANSI/ASHRAE/IES Energy Standard

Posted by Christina B. Farnsworth

Oct 6, 2015 5:27:00 PM

15 ANSI/ASHRAE/IES Standard 90.1-2013, Energy Standard for Buildings Except Low-Rise Residential Buildings close for comment on October 4th: another seven close for comment October 19, 2015.


ANSI (American National Standards Institute), ASHRAE (American Society of Heating, Refrigerating and Air-conditioning Engineers) and IES (Illuminating Engineering Society) have proposed 23 addenda to Standard 90.1-2013.

Eric Richman, chair of the standard’s lighting subcommittee says that some of proposed addenda propose a new set of lighting power densities (LPD) that take into account LED lighting. Currently LPD limits are set using watts per square foot. LEDs deliver a lot more light per watt, thus standards based on incandescents or fluorescent lighting would be inappropriate for calculating the number and type of LEDs.

“Inclusion of LEDs, Richman says, was “seriously considered for the 2013 version of the standard.  However,...the cost of LEDs was still relatively high and the variety and depth of available products was not deemed sufficient to incorporate into a mandatory code. We understand that LED technology continues to improve and become even more cost-effective such that by the time these new requirements are required for building projects, their effectiveness and viability on code compliance will be even easier.”

Calculating Hot—New Climate Zone

Also worth noting is that better and easier to obtain weather data allows more customization of building lighting and HVAC. There is also a new Climate Zone, 0 (which is the hotter area of what used to be Climate Zone 1. Cities in Climate Zone 0 include Mumbai (Bombay), Jakarta and Abu Dhabi. No U.S. cities are in Climate Zone 0, however, Miami and the Hawaii are in Climate Zone 1.


Proposed Addenda:

For the first 15 comment period closes October 4th.

  • 1. bt updates efficiency values for low-voltage dry-type transformers to be consistent with federal law.
  • 2. bx requires a modeler to use the design set point for multi-zone thermostat systems.
  • 3. bv exempts baselines with purchased cooling and heat from the reset control requirements in Appendix G.
  • 4. bw provides a baseline for lighting controls consistent with addendum bm.
  • 5. bz to replaces Table 6.8.1-11 to account for the new rating conditions.
  • 6. by requires pipe insulation on the first 8 feet of branch piping.
  • 7. cb updates duct insulation requirements.
  • 8. ca modifies the fan power criteria by lowering of the motor power threshold for the fan speed control requirement.
  • 9. ce increases the minimum ERV requirements from zero to a reasonable minimum size for smaller units.
  • 10. cc replaces the definition of sidelighting effective aperture that was inadvertently deleted in 90.1-2013.
  • 11. cf to adds additional requirements to section for direct replacement HVAC equipment.
  • 12. ci adjusts the equations for fenestration orientation in Section by requiring a lower solar heat gain coefficient (SHGC) for west and east facing fenestration, and by allowing the use combinations of fenestration area, exterior shading and SHGC to demonstrate compliance.
  • 13. ck makes a change to control set point for the cooling tower to better scale with its climate, clarifies the operation of the condenser water pump as a constant volume pump, and modifies the exception for pump W/gpm for water side economizer.
  • 14. cj modifies a footnote in Appendix G for single zone variable air volume systems serving computer rooms.
  • 15. du requires water-side economizers for non-fan chilled water systems such as radiant cooling or passive chilled beam systems and for active chilled beam systems.

For the following seven, the comment period extends through Oct. 19, 2015.

  • 16. ai includes revisions to the fenestration criteria including U-factors and SHGC in certain climate zones.
  • 17. br was developed in response to the update of Standard 169-2013, Climatic Data for Building Design Standards.
  • 18. bs updates the EER values for water-source variable refrigerant flow products above 65,000 Btu/h.  The proposal also establishes for the first time minimum IEER values for this product class.
  • 19. cd establishes for the first time a product class for dedicated outdoor air systems.
  • 20. cg modifies the exterior LPD for building exteriors.
  • 21. ch modifies the LPD for both space by space and building area methods by including LED technology into the lighting systems.
  • 22. cl relocates Table 7.8 for minimum efficiency requirements for residential water heaters and pool heaters to an informative appendix.

Visit ASHRAE to learn more.

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