REhnu dish-based CPV: Module performance and planned 100 kW plant

Thomas Stalcup, Roger Angel, Peter Strittmatter, Andy Whiteside, Andrew Geary, Frank Sodari, Matt Rademacher, Nick Didato, Silvana Ayala

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

A REhnu CPV module uses a 2.6 m2, back-silvered glass reflector to focus sunlight into a 150 mm diameter receiver housing 36 multijunction cells. Current modules use commercially available 8.8 mm cells operated at 950x concentration with a cell efficiency of 41% for an AM1.5 solar spectrum. Optics in the receiver format the sunlight to illuminate the cells which are mounted slightly apart on four flat circuit boards. Active cooling is provided by liquid circulated to a radiator which can easily be configured to also provide thermal energy in the form of hot fluid at an adjustable temperature up to 80°C. Modules mounted in pairs on a dual axis tracker have been tested in the field. Module conversion efficiency, corrected to 25°C cell temperature (CSTC), is found to peak at 31.2% for air mass 2.75. The I-V curve shows that the concentrated sunlight is distributed between the cells with a uniformity of ±7%. Steps are now being taken to improve uniformity, to reduce infrared losses caused by iron absorption in the reflector glass and by the receiver's antireflection coatings, and to upgrade to 42% efficient cells. Overall efficiency is projected to then increase to 35%. In hybrid mode (electrical + thermal) the total efficiency approaches 80%. REhnu's basic generator unit to be replicated for large scale installations has eight modules in a 2 x 4 array on a dual axis tracker. The first of these 6 kW units with mirrors of very low iron absorption glass has now been installed in the field, and 16 more units are under construction for a 100 kW, grid-connected plant at the Solar Zone of the University of Arizona Tech Park.

Original languageEnglish (US)
Title of host publication12th International Conference on Concentrator Photovoltaic Systems, CPV 2016
EditorsAndreas Bett, Matthew Muller, Maike Wiesenfarth
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735414242
DOIs
StatePublished - Sep 1 2016
Event12th International Conference on Concentrator Photovoltaic Systems, CPV 2016 - Freiburg, Germany
Duration: Apr 25 2016Apr 27 2016

Publication series

NameAIP Conference Proceedings
Volume1766
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other12th International Conference on Concentrator Photovoltaic Systems, CPV 2016
CountryGermany
CityFreiburg
Period4/25/164/27/16

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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