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    REhnu dish based CPV: Performance and reliability improvements based on a year of field experience

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    Author
    Didato, Nicholas
    Sodari, Frank
    Stalcup, Thomas
    Strittmatter, Peter
    Angel, Roger
    Affiliation
    Univ Arizona, Steward Observ Solar Lab
    Issue Date
    2018-09-13
    
    Metadata
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    Publisher
    AMER INST PHYSICS
    Citation
    AIP Conference Proceedings 2012, 020004 (2018); https://doi.org/10.1063/1.5053492
    Journal
    14TH INTERNATIONAL CONFERENCE ON CONCENTRATOR PHOTOVOLTAIC SYSTEMS (CPV-14)
    Rights
    Copyright © 2018 Author(s).
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    REhnu has now built up a year of experience operating two M-8 CPV generators with dish-receiver architecture described in Stalcup et al. 2017 [1]. The M-8 generators use 8 primary collector mirrors made of back-silvered low-iron glass, 1.65 m square with a 1.5 m focal length. Small sealed receivers at each dish focus house 36 Solar Junction 3J cells operating at 950× concentration. Over the year of operation, a good measure of output power vs DNI and atmospheric conditions has been obtained. The efficiency varies through the day depending on air mass. The system is currently best matched to the solar spectrum at air mass 2. The daily peak CSTC efficiency averages 31%, with seasonal variation of ±1% through the year, peaking at 32% in August. Several improvements were made over the year to ensure reliability and to improve optical throughput. A dry air purging system has mitigated damage to the cells from moisture. Material upgrades to secondary reflectors in the receiver have resolved a runaway failure mode that went previously undetected due to inadequate testing time.
    Note
    12 month embargo; published online: 10 September 2018
    ISSN
    0094-243X
    DOI
    10.1063/1.5053492
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.5053492
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    UA Faculty Publications

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