IIT Mumbai, Powai, is saving electricity on a daily basis and it’s being done with a few thousand square feet of mirrors, discovers Piali Banerjee
The Indian Institute of Technology (IIT) is doing it with mirrors
nowadays. There’s an initiative to save electricity on a daily basis in IIT,
Powai, and it’s simply being done with a few thousand square feet of
There are 12 faculty offices in the mechanical department of IIT where
using tube lights during the day is passé. Diffused sunlight is used
instead. (Like most offices, these too are designed in a way where
artificial light is needed all day.)
"Saving electricity is more important than producing it. That’s why we
decided to use the sunlight with the help of mirrors," says Chetan Solanki,
who hit upon the idea and set up mirrors in his own office, only to find
many of his colleagues asking for deflected sunlight in their rooms, too.
So, today he’s a busy man, organising mirrors for everyone.
"I’ve just received a fresh consignment of mirrors, so I’m ready to do up
10 more offices," he says.
So, how do the mirrors actually work? "A long panel of mirrors is fixed
above the windows of the office, facing the floor. This deflects the
sunlight from outside, onto the ceiling of the room. The ceiling being
white, and not-so-smooth, this light is dispersed to the rest of the room,"
"One more mirror is placed near the ceiling, which can actually redirect
the reflected sunlight bang on to the desk. Since this is diffused light, it
brings no heat with it."
For a 10 by 15 sq ft office, you need about 15 sq feet of mirrors, at a
cost of Rs 30 per sq ft. Since every office is fitted with two tube lights,
for a working day of eight hours, this ’mirrorwork’ saves 700 Watthours of
electricity, which works out to Rs 3 saving per day. It takes about six
months to recover the cost of the mirrors… After that, it’s a free lunch
Source: Mumbai Mirror dated 6March 2007