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Design and test of non-evacuated solar collectors with compound parabolic concentrators

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Research and Development

  • Link:http://www.osti.gov/bridge/advancedsearch.jsp
  • Source:http://www.osti.gov/rdprojects
  • Resource Type:Technical Report
  • OSTI Identifier:5624889
  • Published Date:2008-02-06
  • Subject:14 SOLAR ENERGY; COMPOUND PARABOLIC CONCENTRATORS; PERFORMANCE; PARABOLIC COLLECTORS; DESIGN; PERFORMANCE TESTING; CONCENTRATION RATIO; ECONOMICS; THERMAL EFFICIENCY; CONCENTRATING COLLECTORS; EFFICIENCY; EQUIPMENT; SOLAR COLLECTORS; SOLAR CONCENTRATORS; SOLAR EQUIPMENT; TESTING
  • Description:The intermediate range of concentration ratios (1.5X-10X) which can be achieved with CPC's without diurnal tracking provides both economic and thermal advantages for solar collector design even when used with non-evacuated absorbers. The present paper summarizes more than 3 years of research on non-evacuated CPC's and reviews measured performance data and critical design considerations. Concentrations in the upper portions of the practical range (e.g. 6X) can provide good efficiency (4 ...Show More
  • Description:The intermediate range of concentration ratios (1.5X-10X) which can be achieved with CPC's without diurnal tracking provides both economic and thermal advantages for solar collector design even when used with non-evacuated absorbers. The present paper summarizes more than 3 years of research on non-evacuated CPC's and reviews measured performance data and critical design considerations. Concentrations in the upper portions of the practical range (e.g. 6X) can provide good efficiency (40% to 50%) in the 100/sup 0/C to 160/sup 0/C temperature range with relatively frequent tilt adjustments (12 to 20 times per year). At lower concentrations (e.g. 3X) performance will still be substantially better than that for a double glazed flat plate collector above about 70/sup 0/C and competitive below, while requiring only semi-annual adjustments for year round operation. In both cases the cost savings associated with inexpensive reflectors, and the optimal coupling to smaller, simple inexpensive absorbers (e.g. tubes, fins, etc.) can be as important an advantage as the improved thermal performance. ...Show Less
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