Final Review Flashcards
What is the due time and date for all assignments in this course?
Tuesday 9pm
Can you name 3 reasons why we need daylight in buildings?
Free lighting/heating energy
occupants comfort
health
productivity
aesthetic of space
Which photoreceptors are in charge of this function?
Scotopic Vision: rods
Photopic vision: cones
Non-visual response to light: ipRGCs
In the figure below, the spectral radiant flux of an imaginary source with an equi-energetic spectrum is depicted. Can you calculate the radiant flux?
Besides the entrainment of our circadian system to the 24h solar day, what other types of responses are included in the non image forming response to light?
Acute responses
Can you give the equivalent quantities and add each of their units?
Light Shelves?
All of the above
Throw more light deep into a space
increase the total light in a room
reduce the contrast between locations near and far from the window
A daylighting scheme for a commercial building will save money because
All of the above
Employee health
productivity improved
electric lamps are turned off or dimmed when daylight is available
the buildings cooling load is reduced
Which people pioneered the technology of glass window coverings?
The Romans
What are the names of the 2 angles that completely describe the sun position seen from the earth?
Solar altitude and solar azimuth
Can you name three types of sky?
Clear
intermediate
overcast
If you knew the luminous flux of the light sources in a room, you would know?
All of the above
Number of the lumens
the number of foot lamberts
the rooms brightness
Blue light in the morning is beneficial because
It stimulates cortisol secretion
Why does the annual horizontal solar radiation on Earth tend to decrease with rising latitude?
The sun rays travel further distances through the earth’s atmosphere as one moves further away from the equator
Can you list 5 passive design principles that could be applied to a building located in Corvallis?
Rely on solar heat gains during winter
block direct sunlight during summer
daylighting optimization’s through light shelf/daylight reflector/skylight
green roof/rainwater harvesting
deciduous living wall to shade
cool the indoor environment in summer
to let daylight and solar radiations through in winter
What is a Helidon?
A tool reproducing the sun path under which to test a daylighting model
The rationale for using an artificial sky for physical daylighting model testing is
All of the above
The real sky is inconsistently luminous
it’s easier to avoid sunlight penetration
it provides a comfortable space for experimentation
When implementing a daylighting strategy, which of the following is not an important consideration?
All of the above are important
Environmental
architectonic
human
What do these acronyms stand for?
sDA
DF
DA
sDA = spatial daylight autonomy
DF = daylight factor
DA = daylight autonomy
Effective use of daylighting in buildings can be linked to
All of the above
Beauty
improved academic achievement
stronger retail sales
A north-facing window’s light shelf’s most important role in daylighting is to
Increases the amount of of light in the interior space
To calculate the daylight factor at a point in room
Divide the interior illuminance by the exterior luminance and multiply by 100
Can you name three types of glare?
Veiling glare
disability glare
discomfort glare
A students desk in a daylit classroom will be lit by
All of the above
The blue or cloudy sky
reflected light from external objects
the rooms walls and ceilings
When comparing the output of a source of a source with a color temperature of 5000K to one with a color temperature of 3500K
The light from the former seems colder
What are the four main aspects covered in the European Daylight Standard?
Daylight provision
sunlight exposure
window view
protection from glare
In theory, under a perfectly cloudy sky as the sun progress from its noon position to mid-afternoon
The daylight factor will remain constant
What does sDA500/50% greater than or equal to 75% mean?
It means that 75% or more of the indoor area of interest should have an horizontal illuminance of 500 lux or more by daylight only for at least 50% of the occupied time
What are the two main types of simulation algorithms?
Ray Tracing and radiosity
Given a light source with a luminous intensity of 5 Candelas?
The density of its luminous flux at 1 foot is 5 fc
You shine light on a material. 50% of it is reflected by the surface. A further 10% of the original light is absorbed by the material. What is the visible transmittance of the material?
40%
Can you name the three types of light reflection?
Specular reflection
diffuse reflection
spread reflection
An opaque material
Absorbs or reflects light
What are the three properties of a glazing unit that you should look at when choosing one?
Tvis
SHGC
U-value
A desirable light source for a daylighted art museum is?
The sky component
What is the main difference between the Daylight Factor and the Daylight Autonomy?
DF only considers an overcast sky
DA coincides the local climate over and entire year
For a perfectly cloudy sky
The distribution of light is a constant 3:1 from zenith to horizon
Daylighting in classrooms is important because
Good daylighting improves learning
What are the names of the angles that are defined in a sun path diagram?
Azimuth
altitude/zenith
