Hawaii State Certification of Commercial and Residential Building Energy Codes

In accordance with the provisions of Section 304 of the Energy Conservation and Production Act (ECPA), as amended under 42 U.S.C 6833(b)(2)(B)(i) and 42 U.S.C 6833 (a)(l), each state must file certification statements to the U.S. Department of Energy (DOE) that it has reviewed the provisions of its building codes regarding energy efficiency and make a determination as to whether to update its code to meet or exceed the 2015 IECC, as well as ASHRAE 90.1-2013.

In 2010, the State of Hawaii adopted the 2006 IECC with amendments as the State Energy Conservation Code, referenced herein as the Hawaii Energy Code (HEC). The Hawaii State Energy Office has contracted with the Britt/Makela Group (BMG) team to provide analyses of proposed amendments to residential and commercial provisions of the 2015 IECC. The outcome of this analysis will be to facilitate adoption at the state and county level. In addition, the analysis provides a basis for the Hawaii State Energy Office to demonstrate to the United States Department of Energy that the adopted HEC meets or exceeds the efficiency levels of the 2015 IECC and ANSI/ASHRAE/IES Standard 90.1-2013. The HEC was adopted by the State Building Code Council on July 14, 2015, and must now proceed to public review, as required by Hawaii Administrative Rules. The HEC must also be adopted separately by our four counties. The counties anticipate bringing the HEC to their county councils in 2016. State law, (Act 164, 2014), requires that if the counties do not adopt HEC by 2017, the HEC becomes the interim code for the counties.

The commercial qualitative and quantitative analysis was conducted applying research and EnergyPlus building energy modeling software using DOE building prototypes applicable to Hawaii, with local weather data. To complete the analysis, the energy use of prototype buildings constructed to Standard 90.1-2013 was compared to the proposed provisions of the HEC for mechanically cooled commercial buildings. Because the 2015 IECC references ASHRAE 90.1-2013, the HEC would meet or exceed ASHRAE 90.1-2013 unless the amendments were such that overall energy use increased. As documented in Section 6 of the Analyses and Proposal of Hawaii Amendments to the 2015 International Energy Conservation Code (attached), estimated energy savings for two of the four potential commercial amendments were based on research regarding two Hawaii amendments: sub-metering and in-room energy management systems. Each amendment was fow1d to provide increased energy efficiency compared to the 2015 IECC. In addition, the quantitative analysis of a third Hawaii amendment for exterior wall insulation is shown to be at least as efficient as the base ASHRAE 90.1-2013.

Publication Date: 
Tuesday, September 29, 2015