Posted on 07/11/2006 3:21:09 PM PDT by LibWhacker
Researchers work to shrink technology that harnesses sun's energy to both heat and cool
Every day, the sun bathes the planet in energy--free of charge--yet few systems can take advantage of that source for both heating and cooling. Now, researchers are making progress on a thin-film technology that adheres both solar cells and heat pumps onto surfaces, ultimately turning walls, windows, and maybe even soda bottles into climate control systems.
On July 12, 2006, Rensselaer Polytechnic Institute (RPI) researcher Steven Van Dessel and his colleagues will announce their most recent progress--including a computer model to help them simulate the climate within their test structure atop the RPI Student Union--at the Solar 2006 Conference in Denver, Colo.
For 4 years, the researchers have been working on their prototype Active Building Envelope (ABE) system. Comprised of solar panels, solid-state, thermoelectric heat pumps and a storage device to provide energy on rainy days (literally), the ABE system accomplishes the jobs of both cooling and heating, yet operates silently with no moving parts. NSF is supporting the team to determine if a microscale version of the technology will function effectively.
According to Van Dessel, thin-film advances could potentially lead to functional thermal coatings composed of transparent ABE systems. Such systems might vastly improve the efficiency of temperature-control systems.
"The ease of application would make it possible to seamlessly attach the system to various building surfaces," he added, "possibly rendering conventional air conditioning and heating equipment obsolete."
Van Dessel hopes a thin-film version of the ABE system will see uses in a range of industries, from aerospace--in advanced thermal control systems in future space missions--to the automotive industry, where it could be applied to windshields and sun roofs, giving them the ability to heat or cool a car's interior.
"It also may be possible to one day use the ABE system to create packaging materials for thermal control," he added, "which could lead to things like self-cooling soda bottles."
Nothing new .
Way back in 1968 they designed a self cooling soda can. Pulling the pop top released one ounce of freon and cooled the can almost immediatly.
It was rejected. one less ounce of Soda was too much to do without.
No need to insulate the ground, as the earth is a dynamite heat sink.
The earth below two to six feet is generally about at the average annual air temperature year-round. In some areas this will provide dandy cooling, but not in the places you need it most, such as AZ and FL. Central FL, for instance, where I'm at, the ground temperature is around 72F. One needs at least 60F for effective cooling, and frankly that's a little difficult. Need closer to 50F for effective humidity removal.
The system also requires a pretty extensive installation of pipes and heat exchangers, not to mention still requiring electricity to run the pumps and fans. Auxiliary heating or cooling is still needed when the system doesn't provide adequate heat or cooling.
But it's a highly energy-efficient climate control system.
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