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 and green roofs 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 in a tropical climate were investigated across three aspects: 1) solar photovoltaic output, 2) greenery growth, and 3) roof and ceiling surface temperature. Results revealed 1) an increase in photovoltaic performance ratio with greenery [increase of 1.0%], 2) shade-tolerant plant species located under photovoltaic modules exhibited a significantly higher horizontal ground coverage with good health and vigour [increase of 19.8%], and 3) lower roof surface temperature under co-located solar photovoltaics and greenery [reduction of 4.7°C]. In addition, co-location was found to enhance utilization of the roof space by 2.39 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 photovoltaic and greenery for sustainable urban environments.

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