Monday, April 11, 2011
Willis Tower in Chicago to Become Vertical Solar Farm
I have waited decades for this to become real. Before this is perfected, we will produce power and prevent over heating.
It always an obvious outcome of the work and it is now upon us. As often is the case, it was easy to imagine but a bitch to make real.
Once the economics are worked out and proven viable, all buildings will surely retrofit at least their southern exposures.
Chicago’s Willis Tower to Become a Vertical Solar Farm
by Andrew Michler, 03/21/11
filed under: Solar Power,
,Zero energy Sustainable
The project is a collaboration between the tower’s owner and the manufacturer to prove the viability of the building integrated photovoltaic (BIPV) system, which will also save energy by reducing heat gain and cooling costs. The new windows, dubbed high power density photovoltaic glass units (PVGU), are a clever hybrid technology that lays typical monocrystalline silicon solar cell horizontally between two layers of glass to form an individual tile. An internal plastic reflective prism directs angled sunlight onto the solar cells but allows diffuse daylight and horizontal light through. Think of it as a louvered shade which allows for views but cuts out the harsh direct sun.
The manufacturer claims that the vertically integrated solar cells will produce the same amount of energy as normal rooftop-mounted solar panels. This is great news for cities that have precious little rooftop space and towering walls of glass. The product is also a potential breakthrough in energy efficiency in glass towers, where solar heat gain is the bane of energy-efficient design.