Heating and Cooling from the Sun

Harnessing the heating - and cooling - powers of the sun from PhysOrg.com
Imagine heat radiating from the walls of your home on a cold winter night, or the glass in your home's windows emitting cool temperatures on a scorching summer afternoon. Now imagine these systems operating on an endless supply of affordable energy – the sun. Three years ago a team of Rensselaer Polytechnic Institute researchers began developing an "intelligent" heating and cooling system that made these seemingly too-good-to-be-true scenarios a possibility.

Developed by Steven Van Dessel, assistant professor of architecture at Rensselaer, the patented Active Building Envelope (ABE) system uses a photovoltaic (PV) system to collect and convert sunlight into electricity. That power is then delivered to a series of thermoelectric (TE) heat-pumps that are integrated into a building envelope (the walls,windows, and roof). Depending on the direction of the electric current supplied to the TE heat-pump system, the sun's energy can actively be used to make the inside space warmer or cooler. An energy storage mechanism is also integrated to collect extra energy for use when little or no sunlight is available.

The original ABE system uses solar-panels placed on the outside walls or roof of a building. TE heat-pumps approximately one square inch in size are dispersed throughout the building's envelope. Since this system is made up of bulk materials, its implementation can be costly and impractical. Additionally, this ABE system can only be applied to new construction projects, as the TE devices need to be placed inside the building's walls, windows, and roof.

Van Dessel is leading a team of Rensselaer researchers to investigate the potential of ABE systems operating on the micrometer scale. The miniaturized system would function in a similar fashion to the original, but would use thin-film photovoltaic and thin-film thermoelectric materials instead of bulk components. The use of thin-film technologies could potentially result in extremely thin (less than 500 µm) ABE-surfaces. The very fine, transparent material would function as a thermal coating system that could be applied on to various surfaces, much like a glaze.   [...]

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