Building Design II

Question 1

The first step towards designing a building to utilise daylight for illuminating its interior

Answer 1

Acquire information on
The amount of dayligth available
Its distribution outside the building

Question 2

Skyconditions categorized into

Answer 2

Overcast sky
Clear sky
Partly cloudy sky

Question 3

How is the sky luminance in overcast sky

Answer 3

Symmetrical about the zenith, and changes with the elevation

Question 4

How are the sky luminance models treated during a clear sky

Answer 4

Linear combination of clear and overcast

Question 5

Aspects to consider in window design

Answer 5

Functional arrangement of spaces, occupant comfort, structure and energy use in buildings

Question 6

CIE standard overcast

Answer 6

Ratio of the luminance of a sky element to the zenith luminance

Question 7

Daylight factor

Answer 7

The ratio of the internal illuminance to the illuminance simultaniously available on a horizontal plane from the whole of an unobstructed CIE overcast sky

Question 8

Components of a DF

Answer 8

Sky component, externally reflected component and internally reflected component

Question 9

Sky component SC

Answer 9

Light from the patch of sky visible at the point considered

Question 10

Externally reflected component ERC

Answer 10

Light reflected from opposing exterior surfaces and then reached the points

Question 11

Internally reflected component IRC

Answer 11

Light entering through the window but reaching the point only after reflection from internal surfaces

Question 12

Average daily factor ADF

Answer 12

Used as the measure of general illumination from diffuse daylight.

Question 13

Vertical daylight factor VDF

Answer 13

Ratio of the total amount of illuminance falling onto a vertical surface of a building to the instantaneous horizontal illuminance from a complete hemisphere of sky

Question 14

VDF for habitable room and kitchen

Answer 14

8% and 4%