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Comparative Analysis of Ground-Mounted vs. Rooftop Photovoltaic Systems Optimized for Interrow Distance between Parallel Arrays

Author

Listed:
  • Ahmed Bilal Awan

    (Department of Electrical Engineering, College of Engineering, Majmaah University, Majmaah 11952, Saudi Arabia)

  • Mohammed Alghassab

    (Department of Electrical and Computer Engineering, Shaqra University, Riyadh 11911, Saudi Arabia)

  • Muhammad Zubair

    (Department of Electrical Engineering, College of Engineering, Majmaah University, Majmaah 11952, Saudi Arabia)

  • Abdul Rauf Bhatti

    (Department of Electrical Engineering, Government College University Faisalabad (GCUF), Faisalabad 38000, Pakistan)

  • Muhammad Uzair

    (Department of Electrical Engineering, Islamic University of Madinah, Madinah 41411, Saudi Arabia)

  • Ghulam Abbas

    (Department of Electrical Engineering, The University of Lahore, Lahore 54000, Pakistan)

Abstract

The aim of this research is to perform an in-depth performance comparison of ground-mounted and rooftop photovoltaic (PV) systems. The PV modules are tilted to receive maximum solar irradiance. The efficiency of the PV system decreases due to the mutual shading impact of parallel tilted PV modules. The mutual shading decreases with the increasing interrow distance of parallel PV modules, but a distance that is too large causes an increase in land cost in the case of ground-mounted configuration and a decrease in roof surface shading in the case of rooftop configuration, because larger sections of roof are exposed to sun radiation. Therefore, an optimized interrow distance for the two PV configurations is determined with the aim being to minimize the levelized cost of energy (LCoE) and maximize the energy yield. The model of the building is simulated in EnergyPlus software to determine the cooling load requirement and roof surface temperatures under different shading scenarios. The layout of the rooftop PV system is designed in Helioscope software. A detailed comparison of the two systems is carried out based on energy output, performance ratio, capacity utilization factor (CUF), energy yield, and LCoE. Compared to ground-mounted configuration, the rooftop PV configuration results in a 2.9% increase in CUF, and up to a 23.7% decrease in LCoE. The results of this research show that installing a PV system on a roof has many distinct advantages over ground-mounted PV systems such as the shading of the roof, which leads to the curtailment of the cooling energy requirements of the buildings in hot regions and land cost savings, especially for urban environments.

Suggested Citation

  • Ahmed Bilal Awan & Mohammed Alghassab & Muhammad Zubair & Abdul Rauf Bhatti & Muhammad Uzair & Ghulam Abbas, 2020. "Comparative Analysis of Ground-Mounted vs. Rooftop Photovoltaic Systems Optimized for Interrow Distance between Parallel Arrays," Energies, MDPI, vol. 13(14), pages 1-21, July.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:14:p:3639-:d:384671
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    References listed on IDEAS

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    2. Muhammad Zubair & Ahmed Bilal Awan & Abdullah Al-Ahmadi & Ahmed G. Abo-Khalil, 2018. "NPC Based Design Optimization for a Net Zero Office Building in Hot Climates with PV Panels as Shading Device," Energies, MDPI, vol. 11(6), pages 1-20, May.
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    7. Sun, Tao & Shan, Ming & Rong, Xing & Yang, Xudong, 2022. "Estimating the spatial distribution of solar photovoltaic power generation potential on different types of rural rooftops using a deep learning network applied to satellite images," Applied Energy, Elsevier, vol. 315(C).
    8. Bhuvad, Sushant Suresh & Udayraj,, 2022. "Investigation of annual performance of a building shaded by rooftop PV panels in different climate zones of India," Renewable Energy, Elsevier, vol. 189(C), pages 1337-1357.

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