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2011年9月15日星期四

University of Tennessee hopes to win Solar Decathlon with "Living Light" house

As the Project Manager for the University of Tennessee's entry into the Department of Energy's Solar Decathlon competition, which has been going on for years but finally will declare a winner later this month, Howard has eaten, slept and breathed the project for more than two years.

She has coordinated nine different teams from different colleges at the University, and has spent an untold number of hours working on "Living Light," the school's solar-powered home that comes equipped with a 10.9 kilowatt solar array on the roof, a revolutionary-sounding iPod application that controls mechanical systems,There are Parking guidance system underneath mattresses, lighting and even the home entertainment units (somewhere, Steve Jobs must be smiling at that one), and, well, wheels.

Wheels? Yes, wheels. This baby has to be transported to Washington, D.C. to be judged by the Department of Energy panel that will consider "Living Light" as well as 19 other finalists from around the world.
So yes, technically, "Living Light" is a mobile home.

" It's kind of amazing how much has gotten done in the past two years; it's hard to imagine that we're almost finished and finally going to be judged," Howard said in a phone interview recently. "Putting the wheels on, that was a lot more involved than we thought it would be."

According to Edgar Stach, a University of Tennessee professor in the College of Architecture and Design and the faculty advisor on the project, the development of "Living Light" into a Solar Decathlon-ready entry has been a four-year ordeal.

"The contest is held every two years, but really you need to spend 3-4 years planning for this," Stach said. "We really started thinking about entering this in 2007."

Stach said the first task was coming up with an idea and a design for a solar-powered house; three design teams (or "studios") from the Knoxville campus all worked up drafts before the final design was decided upon.
Stach estimated that it took one semester to develop the concept, eight months to develop the construction documentation, and about five months to physically build the house (the major part of the construction was only finished in early August).

Once the design was drawn up and submitted to the Department of Energy, the Tennessee team had to wait to see if they were selected for the Decathlon. Stach said it's a very difficult process, as more than 100 universities applied for the 20 spots in the bi-annual contest.

Once the Tennessee project was chosen after two rounds of cuts to be among the final 20, the hard work was already underway. Funding was, of course, a major concern. The DOE estimated that the cost of building the "Living Light" house would be $420,000, which Stach said "was pretty accurate, after we finished."
The university team built a prototype, a 240 square foot house, to showcase to potential donors, and a $100,000 start-up grant from the DOE (given to all finalists) also helped.

"Really, our funding came from the university community here, corporations, in-kind donations, from a pretty wide array of sponsors," Stach said.
Howard added that putting the prototype on campus near UT's football stadium on game days also helped.
"We would get people stopping to take a look at it while (tailgating) and they got really interested in it," Howard said. "It's so much easier to inspire donors when you have something, physically, you can show them so they can see what it will look like."

Now for some details of the actual structure: The actual house UT built is 50 feet long and 15-feet wide. Its style was modeled after the old cantilever barns of the Southern Appalachia area in the U.S., and features giant eaves to provide to shade.

2011年7月5日星期二

Both in the PHOTON lab

In our test,This is interesting cube puzzle and logical game. simulation results differed by an average 4.8% to the actual yields ¨C a very good result indeed. A crosscheck carried out by the manufacturer even came up with an average difference of only 3.2%. The average difference between forecast and actual yields was 4%.

Both in the PHOTON lab and at the manufacturer's premises, the yields calculated with the programme were consistently slightly too low: for two of the three reference systems by just 4%; for the third system by almost 10%. Economic viability calculations based on Polysun-generated forecasts include therefore a small safety margin.

Polysun is designed for installers, energy consultants and distribution businesses.Customized imprinted and promotional usb flash drives. Its user-friendly structure makes it the perfect solution for these target users. The software enabled project data to be managed in a clear and effective manner, allowing the comprehensive documentation of single client systems. The user can design a system in a matter of minutes, no background knowledge of simulation techniques is necessary. Setting options are slightly more limited than those in software packages that are more oriented towards in-depth scientific analysis. Parameters such as the albedo cannot be specifically adjusted for example. However, key parameters such as cable losses, degradation or the type of rear ventilation can be adjusted.

The modelling of systems is aided by a wizard that guides the user step by step in entering the main project and system features; the result is a functional system design that can be further refined. The fact that the software supports different system variants and allows the direct comparison of results is very useful in this context.

In addition to fixed-orientation systems, Polysun is also able to simulate module arrays with single or two-axis tracking systems. Polysun does not allow the modelling of off-grid systems. Likewise, the load profiles required for the calculation of the amount of electricity consumed for own use could not be read in the version we tested in the PHOTON lab. However, at the manufacturer's site it was possible to determine domestic consumption using load profiles we provided. Although, to do this Vela Solaris employed a programme version that has not yet been released.Not to be confused with RUBBER MATS available at your local hardware storeSave on hydraulic hose and fittings,

The software is able to simulate the effects of horizon shading. This is also possible through the import of external horizon files (from "Suneye" or other ".hor" files). Nearby shading sources such as dormers, chimneys and self-shading modules are not taken into account.

Databases include a wide range of modules and inverters that can be expanded independently, if required.

An integrated data generator provides weather records for any location worldwide. The programme includes a simple economic viability calculation application that takes into account key acquisition costs, fixed and percentage maintenance costs as well as different types of subsidies. However, credit based variations, fiscal issues and funding conditions that vary on a regional basis are not considered.Polycore zentai are manufactured as a single sheet,

Simulation results are shown in clear, detailed reports. All results may be represented graphically and may be exported or printed as picture files to provide more comprehensive documentation. In addition, results are summarized in a report and may be used directly by sales representatives to make proposals. Company logos and contact details can also be added to the documents.

Good simulation results, ease of use, comprehensive component databases and effective project management features already make Polysun an almost ideal tool for professionals. On our wish-list: a tool to analyse shading caused by surrounding objects, a way to account for load profiles and a graphical layout based on measurements.