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Practical Solar, Inc. is an American manufacturer of heliostats used for concentrating solar power, as well as for residential and commercial natural lighting (daylighting) applications.〔(Solar Industry magazine ), by SI Staff on Monday 09 February 2009.〕 The company, located in Boston, Massachusetts, introduced its heliostat system for sale in February 2009.〔(Solar Industry ), by SI Staff on Monday 09 February 2009.〕 Practical Solar’s heliostats are small in the spectrum of heliostats commercially available for harnessing solar thermal energy.〔Wikipedia articles on The Solar Project and Heliostats〕 They each have 8 square feet (0.74 meters) of reflector area.〔"Heliostat Specifications" on (Practical Solar product page )〕 To put this in perspective, the heliostats in a solar power tower project in Seville, Spain each have reflectors nearly in size (120 square meters).〔Shukman, David. "Power station harnesses Sun's rays". BBC News. 2 May 2007 (BBC News article )〕 Practical Solar’s heliostat system is the first computer-controlled heliostat system that can be installed by hand, using only hand tools.〔Solar Today, March 2009, page 46 (PDF edition ) published by the American Solar Energy Society〕 Practical Solar’s founder Bruce Rohr suggested in ''Northeast Sun'' magazine that small heliostats are “more reliable and more cost-effective per square meter of reflective area” than the larger heliostats typically used in solar power tower projects.〔Rohr, B. “The Promise of Small Heliostats”. Northeast Sun. Spring 2009. pp.7-12 (PDF of article )〕 Although a larger number of small heliostats would be needed for a solar power tower project, Mr. Rohr suggested that the total installation area would be about the same, and that the installed price per watt delivered would be lower with small heliostats than large heliostats.〔Rohr, B. “The Promise of Small Heliostats”. Northeast Sun. Spring 2009. (PDF of Northeast Sun article )〕 Practical Solar’s web site states that residential customers also use their heliostats for direct space heating, drying mold, melting ice dams on roofs, and melting snow.〔“Creative Applications”. (Practical Solar "Applications" page )〕 According to the detailed agenda for the 5th Annual Conference on Clean Energy in Boston, Practical Solar’s chief operating officer David Howell〔"About Practical Solar". (Practical Solar "About" page )〕 made a presentation seeking funding for the company at the “Investor Pitch Session” on November 12, 2009.〔"Detailed Agenda". Conference on Clean Energy (Boston, MA) 12–13 November 2009. (PDF of Detailed Agenda )〕 == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Practical Solar」の詳細全文を読む スポンサード リンク
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