NDLI: Optimizing defocus to increase efficiency in concentrator photovoltaic modules

Content Provider	IEEE Xplore Digital Library
Author	Wacaser, B.A. Alyahya, A. Kirchner, P.D. Alowais, A. Martin, Y. Halawani, M. Sandstrom, R.L. Eugenio, N.N. Aljuwaied, M. Badahdah, A. VanKessel, T.G. Khonkar, H.
Copyright Year	2015
Description	Author affiliation: IBM Res., Yorktown Heights, NY, USA (Wacaser, B.A.; Kirchner, P.D.; Martin, Y.; Sandstrom, R.L.; VanKessel, T.G.) \|\| King Abdulaziz City for Sci. & Technol., Riyadh, Saudi Arabia (Alyahya, A.; Alowais, A.; Halawani, M.; Eugenio, N.N.; Aljuwaied, M.; Badahdah, A.; Khonkar, H.)
Abstract	We describe a process for increasing power efficiency of concentrator photovoltaic systems by optimizing the lens-to-cell spacing. We find that there is an optimum defocus position with improved power output and reduced sensitivity to pointing errors, which in combination can result in a more than 10% enhancement. The improvement can be realized by minor changes to module cases which should not require changes to other manufacturing, installation, or component costs. In fact optimizing the defocus position allows for lower costs per unit power due to increased power and relaxed system tolerances. The paper focuses on detailed data illuminating the behavior of ultra high concentration photovoltaic modules. While one can look forward to optimizing defocus through sufficiently detailed simulation, at present, we find that an empirical determination of optimum defocus is necessary. The data reveals that even without design parameters changing, supply chain changes can have a significant impact on the optimum defocus - data from five different module configurations with components from different manufacturing lots are presented. These different configurations serve to illustrate the consequences of component changes and the importance of verifying the optimum defocus. A discussion of the effects that are important to determining the optimum defocus and which underlie these differences is included.
Starting Page	1
Ending Page	6
File Size	2056607
Page Count	6
File Format	PDF
e-ISBN	9781479979448
DOI	10.1109/PVSC.2015.7355758
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-06-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Lenses Three-dimensional displays Sun Sensitivity Position measurement Power measurement Manufacturing Multi-junction Cells UHCPV Optics Primary Lens Light Pipe
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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