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  • Effect of solar photovoltaics on green roof energy balance and evapotranspiration [Elektronski vir]
    Žižak, Tej ; Medved, Sašo ; Arkar, Ciril
    Photovoltaic green roofs represent an emerging technology that combines on-site renewable energy production with the environmental benefits of green roofs. Detailed models for calculating energy ... fluxes on photovoltaic green roofs are presented, relying on accessible meteorological data and setup geometry as input data. A key focus is the accurate modelling of longwave radiation, an often-overlooked component of energy balance. Experimental results reveal up to a 100 W m-² difference in incoming longwave radiation on green roof surface under photovoltaics compared to open-sky conditions, demonstrating the significant impact on the energy bal- ance. The precise modelling of short and longwave radiation is achieved through proposed shading and view factor calculation methods, as well as with a developed parametric model for green roof surface temperature under varying shading factors. Neglecting longwave radiation exchange with photovoltaic modules would result in an 18 % underestimation of daily evapotranspiration. A complete detailed model for evapotranspiration calculation is proposed, achieving a 4.4 % normalized root mean square error for daily predictions. By accurately estimating energy fluxes and evapotranspiration, this study provides tools for quantifying water needs, opti- mizing the synergy between green roofs and photovoltaics, and assessing their broader impacts on urban microclimates.
    Source: Sustainable cities and society [Elektronski vir]. - ISSN 2210-6715 (Vol. 121, [article no.] 106206, 2025, 13 str.)
    Type of material - e-article ; adult, serious
    Publish date - 2025
    Language - english
    COBISS.SI-ID - 227097347

    Link(s):

    https://www.sciencedirect.com/science/article/pii/S2210670725000836?via%3Dihub
    Repository of the University of Ljubljana – RUL
    DOI

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