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Lighting Power Density (LPD) is a lighting power requirement defined in North America by the American National Standards Institute (ANSI), American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), and the Illuminating Engineering Society of North America (IESNA) Lighting subcommittee. Lighting Power Density technically ...
ANSI/ASHRAE/IES Standard 90.1: Energy Standard for Buildings Except Low-Rise Residential Buildings is an American National Standards Institute (ANSI) standard published by ASHRAE and jointly sponsored by the Illuminating Engineering Society (IES) that provides minimum requirements for energy efficient designs for buildings except for low-rise residential buildings (i.e. single-family homes ...
[GR-1] ²: Reduce lighting power density (LPD) with respect to all interior and exterior lighting systems by a minimum of 25%. [GR-2]: Facility must comply with recommended ASHRAE/IESNA Lighting Power Allowance (LPA) by either: [A] the whole building method or [B] space-by-space method.
The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) provides lighting standards in ASHRAE 90.1-2004. EPAct of 2005 set a deadline for states to adopt the ASHRAE 90.1-2004 standards. [19] ASHRAE has recently published the 90.1-2010 with improved lighting standards, this includes:
Thermophysical properties of walls, floors, ceilings, and windows, lighting power density (LPD), plug load density, occupant density, and equipment efficiency play an important role in determining the magnitude of heat gains in a building. [1] ASHRAE handbook of fundamentals refers to the following six modes of entry for heat gains: [1]
[4] The model code, IECC, and the standard, ASHRAE 90.1, apply to commercial buildings. [5] [4] [6] The IECC references several ASHRAE Standards, in particular, ASHRAE 90.1 for commercial building construction. [22] Being a part of the ICC’s collection of model codes, the IECC is revised annually and published in full-form every three years.
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Mathematically, for the spectral power distribution of a radiant exitance or irradiance one may write: =where M(λ) is the spectral irradiance (or exitance) of the light (SI units: W/m 2 = kg·m −1 ·s −3); Φ is the radiant flux of the source (SI unit: watt, W); A is the area over which the radiant flux is integrated (SI unit: square meter, m 2); and λ is the wavelength (SI unit: meter, m).