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For some states the new code has already gone into effect as of January 1, 2017, but the exact timing of implementation depends on each state. The next commercial energy code cycle for most states is the IECC 2015 code and ASHRAE 90.1-2013 alternative path. He is a member of the Consulting-Specifying Engineer editorial advisory board.The latest code cycle requires higher insulation values and an air barrier in the thermal envelope. , providing building-performance simulation efforts across the 375-plus-person firm through both direct project involvement and by supporting project teams on specific and unique modeling issues. The room geometry-adjustment section allows spaces with a room-cavity ratio above the threshold in Table 9.6.1 of Section 9.6 to have their maximum LPD increased by 20%.Ĭory Duggin is the energy-modeling wizard at TLC Engineering for Architecture Inc. As the maximum LPD goes down, it can be difficult to light some geometries to levels recommended by the Illuminating Engineering Society of North America.
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Each revision of ASHRAE 90.1 reduces the maximum allowable lighting-power density (LPD) for some spaces. Section 9.4.1.4 specifies the exterior lighting control types and schedules required, such as façade and landscape lighting that must be shut off between midnight and 6 a.m.ġ0. In Section 9.6, Table 9.6.1 breaks down which interior lighting control types are required for each space, by space type. Some of the largest changes to ASHRAE 90.1-2013 related to the lighting controls, which are all mandatory. Since the lighting-power allowance (Sections 9.2.2.1 and 9.2.2.2 of ASHRAE 90.1) is a prescriptive requirement, many assume the lighting controls are too. Mandatory exterior and interior lighting controls. New buildings must have meters installed to separately monitor total electrical energy, HVAC systems, interior lighting, exterior lighting, and receptacle circuits. However, in the 2015 IECC, Section C408.2 states that systems with less than 480,000 Btu/h do not require commissioning.Ĩ. ASHRAE 90.1-2013, Section 6.7.2.4, states that projects with greater than 50,000 sq ft of conditioned floor area must be commissioned. ASHRAE 90.1 and the IECC differ on how they define when HVAC systems are required to be commissioned. Requiring commissioning for HVAC systems. It is a prescriptive requirement, thus can be traded off on the performance compliance path.ħ. The requirements are divided up by hood type and appliance duty rating. The maximum net exhaust flow rate in cubic feet per minute (CFM) per linear foot of hood is set in ASHRAE 90.1, Table 6.5.7.1.3 of Section 6.5.7.1. Maximum net kitchen hood-exhaust flow rate. If a project can implement the more stringent mandatory requirements of ASHRAE 90.1, its performance compliance path (Section 11) may be easier to comply with than the IECC.Ħ. Section 11 of ASHRAE 90.1-20 only requires the design energy cost to be less than or equal to the energy cost. Section C401.2(3) of the 2012 IECC added the requirement that the design energy cost must be less than or equal to 85% of the standard reference design to compensate for differences between the prescriptive requirements and the standard reference design. However, the threshold is a mandatory requirement in 2015 IECC (Section C403.2.7), which means there is no alternative for compliance.ĥ.
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Fan systems that exceed the total supply-airflow and outdoor-airflow percentage threshold outlined in Section 6.5.6.1 may choose to trade off the added efficiency of exhaust-air energy recovery via the performance-based compliance path in ASHRAE 90.1-2013. The prescriptive maximum window-to-wall ratio (WWR) is 40% in ASHRAE 90.1-2013, Section 5.5.4.2.1, so buildings can comply prescriptively with ASHRAE 90.1-2013 and have more glass than those complying with 2015 IECC, that has a prescriptive maximum WWR limit of 30% (C402.4.1, without exceptions).Ĥ.