Windows Shading

In addition to their optimum orientation, the windows of the MEWC building are "protected" by appropriate shading mechanisms to allow for maximum light to penetrate while minimising the transfer of heat. Two types of window facades have been used - punch hole facades in the lower floors and curtain wall with exterior louvres in the upper floors.

Punch hole windows have double shading mechanisms - the overhang and the light shelf. These act to prevent the direct penetration of sunlight. Instead, the sun's rays hit the top of the light shelf from where it is reflected into the room. This diffusing action takes away much of the heat, while allowing sufficient light to enter.

Diffused natural light carries half the amount of heat as traditional flourescent lighting for the same level of luminosity. Measuring the efficiency of light sources in terms of luminosity (lumen) against unwanted heat (watts), diffused daylight produces 120 lumen/watt, as compared to the 60 lumen/watt of flourescent lighting.

Few windows in the building that do face east are more heavily shaded to protect against the low morning sun. Added protection against heat is afforded by 12mm-thick light green tinted glazing on the panes which allows 65 per cent of the available daylight in while keeping 49 per cent of the heat out.