DAYLIGHT PERFORMANCE ANALYSIS (DAYLIGHT FACTOR)

The daylight factor can be defined as a ratio of the internal illuminance divided by the external illuminance, in percentage, under the overcast sky condition It can be explained that the higher the daylight factor, the more amount of daylight in the room space (Kubba, 2012) However, the effects of high illuminance has to be investigated individually

The appropriate daylighting is obviously explained in researches that it not only helps in reducing energy consumption and operating cost, but also enhance occupant’s thermal comfort and quality of natural environment

Daylighting information

Project: Mills House, Austin Maynard

Sky Model : 6-CIE OVERCAST SKY

Location : Melbourne

Working plane height (m) : 0 75

Max grid size : 0 3

Min grid size: 0 3

Daylight factor threshold : No less than 2%

Although the DF can be estimated, the distinct building orientation would not significantly affect the result In other words, there is slightly change in the DF value wherever the location is As a result, it is the important limitation to be considered.

Benchmark Greenstar criteria:

The requirement has been used as a guideline and deliver three main intentions, which are being resilient, well-being, and a net zero carbon emission home. To achieve this standard there are some criteria followed below The standard is for the design and construction of Class 1a building

Criteria for Light quality:

• Solar access and daylight

Achieving daylight factor (DF) more than 2% in the living area and bedroom

Observation and assessment:

• Despite being in different climate zones Melbourne and Brisbane both show similar lux values entering the building,

• Light is not distributed uniformly in both the cases in all areas of the house

• The bathroom on the 1st floor, Master Bedroom and the rear part of the living area experiences highest illuminance and daylight factor in the house

• As discussed, Service areas has the least DF and would require some openings for light to enter.

• Bedroom 1 and Bedroom 3 – Good amount of light entering through them

• The areas near courtyard use it as a main source of daylight than other openings along them

• Overall, Average Daylight factor is valued around 2.306 which is just above the minimum value of 2 percent Floor area within the DF threshold is 33 040

Recommendations:

• Bathroom 2, Bedroom 2 – Shading Required

• Living area, Corridor on first floor, Service areas –Openings to be provided to reduce the use of artificial lighting