Temperatures of building applied photovoltaic (BAPV) modules: Air gap effects

Jaewon Oh, Govindasamy Tamizhmani, Ernie Palomino

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

    4 Citations (Scopus)

    Abstract

    Building applied photovoltaics (BAPV) is a major application sector for photovoltaics (PV). Due to the negative temperature coefficient of power output, the performance of a PV module decreases as the temperature of the module increases. In hot climatic conditions like Arizona, the BAPV module temperature can reach as high as 90-95°C during peak summer. Considering a typical 0.5%/°C power drop for crystalline silicon modules, about 30% performance drop would be expected during peak summer because of the difference between rated temperature (25°C) and operating temperature (∼90°C) of the modules. In order to predict the performance of PV modules, it becomes necessary to predict the module temperature. The module temperature is dictated by air gap between module and roof surface, irradiance, ambient temperature, wind speed, and wind direction. Based on the temperature and weather data collected over a year in Arizona, a mathematical thermal model has been developed and presented in this paper to predict module temperature for five different air gaps (0, 1, 2, 3 and 4 inches) as well as modules with a thermally insulated (R30) back. The thermally insulated back is expected to serve as the worst case temperature a BAPV module could ever experience. This paper also provides key technical details on: the specially built simulated rooftop structure; mounting configuration of PV modules on the rooftop structure; LabVIEW program developed for data acquisition; and a data processing program for an easy data analysis.

    Original languageEnglish (US)
    Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
    Volume7773
    DOIs
    StatePublished - 2010
    EventReliability of Photovoltaic Cells, Modules, Components, and Systems III - San Diego, CA, United States
    Duration: Aug 3 2010Aug 5 2010

    Other

    OtherReliability of Photovoltaic Cells, Modules, Components, and Systems III
    CountryUnited States
    CitySan Diego, CA
    Period8/3/108/5/10

    Fingerprint

    modules
    Module
    air
    Air
    Temperature
    temperature
    Predict
    summer
    Negative temperature coefficient
    Silicon
    Mountings
    wind direction
    LabVIEW
    Thermal Model
    Roofs
    roofs
    Irradiance
    Wind Speed
    Data acquisition
    mounting

    Keywords

    • Air gap
    • BAPV
    • Module temperature
    • Rooftop
    • Thermal model

    ASJC Scopus subject areas

    • Applied Mathematics
    • Computer Science Applications
    • Electrical and Electronic Engineering
    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

    Cite this

    Oh, J., Tamizhmani, G., & Palomino, E. (2010). Temperatures of building applied photovoltaic (BAPV) modules: Air gap effects. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 7773). [777305] https://doi.org/10.1117/12.861069

    Temperatures of building applied photovoltaic (BAPV) modules : Air gap effects. / Oh, Jaewon; Tamizhmani, Govindasamy; Palomino, Ernie.

    Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7773 2010. 777305.

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

    Oh, J, Tamizhmani, G & Palomino, E 2010, Temperatures of building applied photovoltaic (BAPV) modules: Air gap effects. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 7773, 777305, Reliability of Photovoltaic Cells, Modules, Components, and Systems III, San Diego, CA, United States, 8/3/10. https://doi.org/10.1117/12.861069
    Oh J, Tamizhmani G, Palomino E. Temperatures of building applied photovoltaic (BAPV) modules: Air gap effects. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7773. 2010. 777305 https://doi.org/10.1117/12.861069
    Oh, Jaewon ; Tamizhmani, Govindasamy ; Palomino, Ernie. / Temperatures of building applied photovoltaic (BAPV) modules : Air gap effects. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7773 2010.
    @inproceedings{8830472b49a743be9211f49cbee15aa8,
    title = "Temperatures of building applied photovoltaic (BAPV) modules: Air gap effects",
    abstract = "Building applied photovoltaics (BAPV) is a major application sector for photovoltaics (PV). Due to the negative temperature coefficient of power output, the performance of a PV module decreases as the temperature of the module increases. In hot climatic conditions like Arizona, the BAPV module temperature can reach as high as 90-95°C during peak summer. Considering a typical 0.5{\%}/°C power drop for crystalline silicon modules, about 30{\%} performance drop would be expected during peak summer because of the difference between rated temperature (25°C) and operating temperature (∼90°C) of the modules. In order to predict the performance of PV modules, it becomes necessary to predict the module temperature. The module temperature is dictated by air gap between module and roof surface, irradiance, ambient temperature, wind speed, and wind direction. Based on the temperature and weather data collected over a year in Arizona, a mathematical thermal model has been developed and presented in this paper to predict module temperature for five different air gaps (0, 1, 2, 3 and 4 inches) as well as modules with a thermally insulated (R30) back. The thermally insulated back is expected to serve as the worst case temperature a BAPV module could ever experience. This paper also provides key technical details on: the specially built simulated rooftop structure; mounting configuration of PV modules on the rooftop structure; LabVIEW program developed for data acquisition; and a data processing program for an easy data analysis.",
    keywords = "Air gap, BAPV, Module temperature, Rooftop, Thermal model",
    author = "Jaewon Oh and Govindasamy Tamizhmani and Ernie Palomino",
    year = "2010",
    doi = "10.1117/12.861069",
    language = "English (US)",
    isbn = "9780819482693",
    volume = "7773",
    booktitle = "Proceedings of SPIE - The International Society for Optical Engineering",

    }

    TY - GEN

    T1 - Temperatures of building applied photovoltaic (BAPV) modules

    T2 - Air gap effects

    AU - Oh, Jaewon

    AU - Tamizhmani, Govindasamy

    AU - Palomino, Ernie

    PY - 2010

    Y1 - 2010

    N2 - Building applied photovoltaics (BAPV) is a major application sector for photovoltaics (PV). Due to the negative temperature coefficient of power output, the performance of a PV module decreases as the temperature of the module increases. In hot climatic conditions like Arizona, the BAPV module temperature can reach as high as 90-95°C during peak summer. Considering a typical 0.5%/°C power drop for crystalline silicon modules, about 30% performance drop would be expected during peak summer because of the difference between rated temperature (25°C) and operating temperature (∼90°C) of the modules. In order to predict the performance of PV modules, it becomes necessary to predict the module temperature. The module temperature is dictated by air gap between module and roof surface, irradiance, ambient temperature, wind speed, and wind direction. Based on the temperature and weather data collected over a year in Arizona, a mathematical thermal model has been developed and presented in this paper to predict module temperature for five different air gaps (0, 1, 2, 3 and 4 inches) as well as modules with a thermally insulated (R30) back. The thermally insulated back is expected to serve as the worst case temperature a BAPV module could ever experience. This paper also provides key technical details on: the specially built simulated rooftop structure; mounting configuration of PV modules on the rooftop structure; LabVIEW program developed for data acquisition; and a data processing program for an easy data analysis.

    AB - Building applied photovoltaics (BAPV) is a major application sector for photovoltaics (PV). Due to the negative temperature coefficient of power output, the performance of a PV module decreases as the temperature of the module increases. In hot climatic conditions like Arizona, the BAPV module temperature can reach as high as 90-95°C during peak summer. Considering a typical 0.5%/°C power drop for crystalline silicon modules, about 30% performance drop would be expected during peak summer because of the difference between rated temperature (25°C) and operating temperature (∼90°C) of the modules. In order to predict the performance of PV modules, it becomes necessary to predict the module temperature. The module temperature is dictated by air gap between module and roof surface, irradiance, ambient temperature, wind speed, and wind direction. Based on the temperature and weather data collected over a year in Arizona, a mathematical thermal model has been developed and presented in this paper to predict module temperature for five different air gaps (0, 1, 2, 3 and 4 inches) as well as modules with a thermally insulated (R30) back. The thermally insulated back is expected to serve as the worst case temperature a BAPV module could ever experience. This paper also provides key technical details on: the specially built simulated rooftop structure; mounting configuration of PV modules on the rooftop structure; LabVIEW program developed for data acquisition; and a data processing program for an easy data analysis.

    KW - Air gap

    KW - BAPV

    KW - Module temperature

    KW - Rooftop

    KW - Thermal model

    UR - http://www.scopus.com/inward/record.url?scp=77957826468&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=77957826468&partnerID=8YFLogxK

    U2 - 10.1117/12.861069

    DO - 10.1117/12.861069

    M3 - Conference contribution

    AN - SCOPUS:77957826468

    SN - 9780819482693

    VL - 7773

    BT - Proceedings of SPIE - The International Society for Optical Engineering

    ER -