Holistic Assessment of Co-Located Solar Photovoltaics and Greenery in the Tropics: Results on Solar Photovoltaic Output, Greenery Growth, and Roof Surface Temperature

Abstract

Co-located solar photovoltaics (PV) and green roofs (GR) systems have gained increased attention for generating renewable energy and incorporating greenery in urban environments. In this study, the impact of co-located solar photovoltaics and greenery (PV-GR) in a tropical climate were investigated across three aspects: 1) solar PV output, 2) greenery growth, and 3) roof and ceiling surface temperature. Results revealed 1) an increase in solar PV performance ratio with greenery [increase of 1.0%], 2) shade-tolerant plant species located under solar PV exhibited a significantly higher horizontal ground coverage with good health and vigour [increase of 19.8%], and 3) lower roof surface temperature under PV-GR [reduction of 4.7°C]. In addition, co-locating PV and greenery was found to enhance the productivity of the roof space by 3.56 times relative to typical bare concrete roof. The results of this study could inspire similar research, especially in the tropics, to incorporate renewable energy generation through solar PV and greenery for sustainable urban environments.

Keywords: Co-located system, Photovoltaic (PV), Green Roof (GR), Operational performance, Multifunctional Benefits, Tropical Climate