Acoustics & Illumination: Window Correction Factor Quiz

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What is the purpose of using a plan of the room along with the protractor to determine the sky component (SC)?

To determine the average altitude angle

To read values on the inner and outer scales of the protractor

To get a correction factor for the window of a finite length (correct)

To calculate the externally reflected component (ERC)

What is the initial sky component (SC) value read from the outer scale of the protractor?

0.2%

2.3%

4.8% (correct)

4.6%

How is the correction factor for the sky component (SC) calculated?

By multiplying the initial SC value by the difference between the inner scale values

By interpolating an arc for the average altitude angle and reading the values on the inner scale

By subtracting the inner scale values from the initial SC value

By adding the inner scale values if they are on the same side, or using the sum if they are on different sides (correct)

What is the purpose of drawing radial lines from point O to the two edges of the window on the plan?

To read the values on the inner scale Signup and view all the answers

What is the value of the sky component (SC) after applying the correction factor?

2.3% Signup and view all the answers

What is the purpose of determining the average altitude angle when calculating the sky component (SC)?

To read values on the inner scale of the protractor Signup and view all the answers

What should be done if there is an obstruction outside the window?

The outline of the obstruction must be established in the section. Signup and view all the answers

What is the reflectance of the obstruction's surface assumed to be?

$ ho = 0.2$ Signup and view all the answers

What is the first step in determining the Internally Reflected Component (IRC)?

Find the ratio of window area to the total surface area of the room. Signup and view all the answers

What is the purpose of laying a straight edge across the points on the nomogram for IRC determination?

To find the IRC on scale C. Signup and view all the answers

What is the purpose of determining the altitude angle of the top edge of an obstruction outside the window?

To find the corrected IRC on scale E. Signup and view all the answers

What is the final step in determining the Internally Reflected Component (IRC)?

Multiply the IRC by the D-factor to get the corrected IRC. Signup and view all the answers

Which component represents the direct light from the sky that enters the room through the window?

Sky Component (SC) Signup and view all the answers

What does the formula DF = [Ei / Eo] × 100 represent?

The formula to determine the Daylight Factor (DF) Signup and view all the answers

Which component represents the light that is reflected from external surfaces onto the window?

Externally Reflected Component (ERC) Signup and view all the answers

What is the purpose of using a physical model (1:20) in daylighting prediction?

To provide the most reliable prediction for complex geometries and unusual situations Signup and view all the answers

What is the purpose of artificial skies in daylighting studies?

To simulate overcast sky conditions for daylighting studies Signup and view all the answers

What does the formula DF = [SC + ERC + IRC] × M × G × B represent?

The formula to calculate the Daylight Factor (DF) Signup and view all the answers