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- ASHRAE 90.1 LIGHTING POWER DENSITY TABLE MANUAL
- ASHRAE 90.1 LIGHTING POWER DENSITY TABLE FULL
- ASHRAE 90.1 LIGHTING POWER DENSITY TABLE PORTABLE
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ASHRAE 90.1 mainly considers energy cost and NECB considers energy consumption to achieve compliance.The occupancy schedules used for ASHRAE and NECB also differ in a couple categories as shown in the graphs below:
ASHRAE 90.1 LIGHTING POWER DENSITY TABLE MANUAL
However, the Plug loads for ASHRAE 2013 User Manual and NECB 2015 are different for the categories shown here:įigure 3 Plug Load comparison for ASHRAE and NECB The lighting loads for ASHRAE 90.1 and NECB standard building types are similar across the board. If the proposed space type is not present in the table 8.4.4.7.-A then the system which most closely corresponds to that system should be selected. The definitions for 7 different systems are given in table 8.4.4.7.-B.
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NECB, on the other hand, suggests selecting a system based on your space type listed in table 8.4.4.7.-A. Also, with NECB there are trade-off paths that one can pursue to achieve compliance.įor baseline system modeling, ASHRAE suggests that each HVAC system in a proposed building design should be matched on a one-to-one correspondence with one of the 13 HVAC systems in Table G3.1.1-4. The principal difference is that ASHRAE has additional mandatory requirements for any path chosen whereas for NECB almost all requirements are prescriptive. Figure 2 Canada NECB Climate Zone ĪSHRAE 90.1 (2013) and NECB 2015 both have similarly structured compliance paths. Also, ASHRAE identifies HDD 5000 to 7000 as zone 7 whereas NECB further classifies them into zones named 7A (HDD 5000 to 6000) and 7B (HDD 6000 to 7000), as seen below. NECB 2015, however, utilizes only Heating Degree-Days for its categorization. ASHRAE utilizes both Heating and Cooling Degree-Day categories to classify their climate zones. The climate zones used for the article were selected by their number of Degree Days. There are various parameters which are taken into account for this study such as climate zones, compliance path, HVAC systems, Schedules etc. Going beyond the standards set by ASHRAE 90.1-2001 can be achievable without major compromises.This article analytically compares two major reference energy standards, ASHRAE 90.1 (2013) and NECB 2015, and spots the key differences between them. Many of today’s leading energy-efficient lighting technologies, such as the National Electrical Manufacturers Association (NEMA) Premium-rated electronic ballasts, high-performance T8 lamps, and fluorescent troffer fixtures - diffuse lighting or volumetric lighting - significantly reduce lighting power. it must reduce the interior lighting power density by 25-40 percent lower than the maximum values in ASHRAE 90.1-2001’s Table 9.3.1.1 or Table 9.3.1.2.Įxit signs also are not included, so replacing an incandescent exit sign with a light-emitting-diode exit sign does not contribute to the lighting power-density reduction.
ASHRAE 90.1 LIGHTING POWER DENSITY TABLE PORTABLE
ASHRAE 90.1 LIGHTING POWER DENSITY TABLE FULL
The rule enables organizations to deduct the full cost of new interior lighting, capped at $0.30-$0.60 per square foot, if the new lighting achieves a lighting power density that is 25-40 percent lower than the maximum values published in ASHRAE 90.1-2001. The Interim Lighting Rule was supposed to be temporary, but it has remained in effect.