What is the unit of light power density?
The total input power of the installed lighting system per unit floor area, typically expressed as watts per square meter or per square foot.
How do you calculate the power of lighting density?
To complete the calculation, the total allowed power is first determined by multiplying the total building area by the maximum allowed power density. Next, the total lighting power of all installed fixtures is calculated. Finally, the installed power is compared to the allowed power, and must be less to meet Code.
What is LPD W m2?
lighting power density (LPD) (unit : W/m2) means the maximum circuit wattage consumed by fixed lighting installations per unit floor area of an illuminated space.
What is ashrae standard for lighting?
Lighting power allowance: 1.00 W/sf. All lighting shall be automatically controlled to turn off when the building is either unoccupied or scheduled to be unoccupied. Each space shall have a manual control device that allows the occupant to reduce lighting power by a minimum of 50% and to turn lighting off.
What does LPD stand for in lighting?
When planning a new building or doing a major remodel, the lighting systems must meet local or state energy code. Primarily this means you are only allowed a certain amount of Lighting Power Density (LPD) — the lighting watts per square foot.
What is lighting power density measured in quizlet?
Lighting power density is the installed lighting power per unit area (the amount of electrical power used to illuminate a space). It is usually expressed in Watts per unit of area.
What is the power density of LED?
The LED power density can be controlled from 0 to 40 mW/cm2, 0–100 mW/cm2, 0–60 mW/cm2 for red, blue, and green LEDs, respectively.
What is the latest ashrae code?
ASHRAE 90.1-2019
ASHRAE 90.1-2019 is published as the most recent version, but has not been analyzed as part of the research mentioned or extensively adopted.
Is ashrae a code?
Status as an energy code and industry standard Many states apply ASHRAE 90.1 to buildings being constructed or under renovation. Most states apply the standard or equivalent standards for all commercial buildings. Others apply the standard or equivalent standards for all government buildings.
What is lighting power density measured in LEED?
watts per square foot
Lighting Power Density technically represents the load of any lighting equipment in any defined area, or the watts per square foot of the lighting equipment. However, in the lighting industry it is often associated with the lighting power allowance (LPA) permitted by the building energy code in question.
How is intensity of light measured?
It is measured in footcandles or lux – it is the amount of light (lumens) falling on a surface (over any given square foot or square meter). Therefore, light intensity is measured in terms of lumens per square foot (footcandles) or lumens per square meter (lux).
Which of the following is typically measured with a water manometer?
76 Cards in this Set
| One reason for using a reducing plenum system is to keep | D. both A and C |
|---|---|
| Which of the following is typically measured with an inclined water manometer | Static pressure in a duct system |