What is the reflectance of concrete?
0.40
Approximate Reflectance Values of Typical Building Finishes
| Reflectance | Material |
|---|---|
| 0.40 | Concrete |
| 0.35 | Synthetic Grass |
| 0.25 | Grass |
| 0.10 | Asphalt |
What is the reflectance of a wall?
Walls have an average LRV of 0.4 (40%) or less for at least 80% of surface area.
What is the reflection factor of walls ceiling and flooring?
Their study suggested high reflectance values between 70% and 80% for ceilings and reflection coefficient above 50% for walls in order to maximize the distribution of daylight in the area.
What is the reflectance value of a bare concrete?
of ·ds, The LEED-NC Reference Guide7 provides a default emittance of 0.9 for concrete and solar reflectance values of 0.35 for “new typical gray concrete” and 0.7 for “new typical white concrete.” It also reports default SRI values for new gray and new white concrete of 35 and 86, respectively.
What is Sri value?
SOLAR REFLECTANCE INDEX (SRI): Incorporates both solar reflectance and thermal emissivity in a single value. SRI measures the roof’s ability to reject solar heat, defined such that a standard black (reflectance 0.05, emittance 0.90) is 0 and a standard white (reflectance 0.80, emittance 0.90) is 100.
What are the recommended surface reflectance for the offices?
ASHRAE/IES Recommended Surface Reflectances
| Office | K-12 School | Warehouse and Self-Storage |
|---|---|---|
| Ceiling: >80% (90% if indirect lighting) Walls: >70% (same for >2.5-ft. vertical partitions) | Ceiling: 70% (preferred 80-90%) Walls: 50% Floor: 20% | Ceiling: 80% Walls: 30% Product/Floor: 20% |
What does LRV stand for?
Light Reflectance Value
A color’s Light Reflectance Value (LRV) measures the amount of visible and usable light that reflects from (or absorbs into) a painted surface. Simply put, LRV measures the percentage of light a paint color reflects.
What are the factors of reflection?
Factors that affecting the reflection of light are : The angle of refraction, the angle at which the light strikes the surface, and material that the light is hitting.
What is the solar reflectance of concrete?
What is a good reflectance value for a room?
Room Reflectance • Surfaces with less reflectance will bounce less light • Typical Reflectance Values: –75%-90%White, Off White, Grey, Light tints of Blue or Brown –30%-60% Medium Green, Yellow, Brown, or Grey –10%-20% Dark Grey, Medium Blue –5%-10%Dark Blue, Brown. Dark Green, and many wood finishes
How does reflectance affect lighting?
Approximate Reflectance Values of Typical Building Finishes The effect a lighting system creates in an interior is strongly influenced by the properties of the room surfaces. Surface Reflectance greatly assists with light levels. Areas with low reflectance levels need more light to achieve the same lux levels.
How does your floor’s LRV affect the effectiveness of your lighting?
Here’s how your floor’s LRV can maximize the effectiveness of your facility’s lighting. In addition to selecting energy-efficient lighting such as LEDs, choosing a floor coating with a high LRV can help you spend less on energy while still providing a well-lit workplace.
What is the candle power distribution curve?
Candlepower Distribution Curve Candlepower distribution curves provides intuitive information on how a luminairewill perform Candelavalues are used in calculations to predict light levels 0 deg10 20 30 40 50 60 70 80 90 deg 300 600 900900 12001200 1500 Distribution angles Candle Power Distribution Asymmetrical Distribution Curve