Definitions

Question 1

Average daylight factor

Answer 1

how the level of light inside a building compares to the level of light outside a building based on a standard overcast sky

Question 2

daylight factor definitions

Answer 2

A means of rating daylighting performance independently of the actually occurring, instantaneous sky (ratio)

Question 3

CBDM

climate-based daylight modelling

Answer 3

prediction of any luminous quality using realistic sun and sky conditions derived from standardised climate data

Question 4

‘performance-based’ design

Answer 4

refers to the approach to building design which helps develop your understanding of your building early in the design process

Question 5

No-skyline

Answer 5

amount of sky visible at the workplace is a governing factor for general illumination, where obstructions are present it is common to estimate no sky-line

Question 6

U-value

Answer 6

used to measure how effective elements of a building’s fabric as an insulator and effective they are at preventing heat is able to transmit between outside and inside

Question 7

median daylight factor

Answer 7

middle value after the data has been rank ordered from lowest to highest, informs on the spatial distribution of the day-light factor

Question 8

COP

coefficient of performance

Answer 8

useful energy out / energy in

the ratio of useful heating/cooling to work required

Question 9

energy efficiency

Answer 9

useful energy out / energy in