NDLI: BAPV modules: Installed-NOCT and temperature coefficients after 1-year exposure

Content Provider	IEEE Xplore Digital Library
Author	Jaewon Oh TamizhMani, G.
Copyright Year	2011
Description	Author affiliation: Arizona State University, Photovoltaic Reliability Laboratory (Jaewon Oh; TamizhMani, G.)
Abstract	Building applied photovoltaics (BAPV) is one of the major applications for photovoltaic (PV) modules. The performance of PV modules is heavily influenced by their operating temperature; for example, the power of crystalline silicon drops at a rate of about 0.5%/°C. The operating temperature is primarily dictated by three major parameters: ambient temperature, irradiance and wind speed. The magnitude of the influence of these parameters depends on the type of installation: open-rack or building-applied. Recognizing these issues, the design qualification standard of PV modules, IEC 61215, requires reporting NOCT (nominal operating cell temperature) values for the open-rack but not for the BAPV modules. This paper deals with the NOCT determination of BAPV modules, herein called installed-NOCT (INOCT). The effect of air gap (between module and rooftop) on INOCT values is also quantitatively determined in this work. The INOCT values determined for different air gaps (0, 1, 2, 3 and 4-inch) using the conventional thermal model of IEC 61215 are also compared with the values determined using the BAPV thermal model previously developed by Arizona State University. Furthermore, it is commonly assumed that the temperature coefficients of PV modules do not change over time in the field and all the energy yield calculations are performed based on the temperature coefficients of fresh modules. This work investigates if this assumption is accurate or not, through the determination of temperature coefficients of 14 modules before and after 1-year of rooftop exposure.
Starting Page	000838
Ending Page	000841
File Size	937136
Page Count	4
File Format	PDF
ISBN	9781424499663
ISSN	01608371
e-ISBN	9781424499656
DOI	10.1109/PVSC.2011.6186083
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature distribution IEC standards Atmospheric modeling MONOS devices Temperature measurement Photovoltaic systems
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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