New polymer-based solar-thermal device cuts heating cost by 40pc
April 5th, 2011 - 5:32 pm ICT by ANIWashington, April 05 (ANI): Researchers have developed a new polymer-based solar-thermal device that could shave the cost of heating a home by as much as 40 percent.
The device is the first to generate power from both heat and visible sunlight.
Geothermal add-ons for heat pumps on the market today collect heat from the air or the ground. This new device uses a fluid that flows through a roof-mounted module to collect heat from the sun while an integrated solar cell generates electricity from the sun’s visible light.
“It’s a systems approach to making your home ultra-efficient because the device collects both solar energy and heat,” said David Carroll, director of the Center for Nanotechnology and Molecular Materials at Wake Forest University.
“Our solar-thermal device takes better advantage of the broad range of power delivered from the sun each day.”
The design of the new solar-thermal device takes advantage of heat through an integrated array of clear tubes, five millimeters in diameter. They lie flat, and an oil blended with a proprietary dye flows through them. The visible sunlight shines into the clear tube and the oil inside, and is converted to electricity by a spray-on polymer photovoltaic on the back of the tubes. This process superheats the oil, which would then flow into the heat pump, for example, to transfer the heat inside a home.
Unlike the flat solar cells used today, the curve of the tubes inside the new device allows for the collection of both visible light and infrared heat from nearly sunrise to sunset. This means it provides power for a much greater part of the day than does a normal solar cell.
Because of the general structure and the ability to capture light at oblique angles, this is also the first solar-thermal device that can be truly building-integrated - it can be made to look nearly identical to roofing tiles used today.
Tests of the solar-thermal device have shown 30 percent efficiency in converting solar energy to power. By comparison, a standard solar cell with a polymer absorber has shown no greater than 8 percent conversion efficiency.
The research team will build the first square-meter-size solar-thermal cell this summer, a key step in getting the technology ready for market.
The work appears in the March issue of the peer-reviewed journal Solar Energy Materials and Solar Cells. (ANI)
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Tags: dye, electricity, heat pump, heat pumps, infrared heat, millimeters, molecular materials, nanotechnology, oblique angles, photovoltaic, polymer, roofing tiles, solar cell, solar cells, solar energy, sunrise to sunset, systems approach, visible light, visible sunlight, wake forest university