THE IMPACT OF PHOTOVOLTAIC MODULES ON THERMAL ENVIRONMENT OF BUILDING ROOFTOPS IN SINGAPORE

Abstract

Given a surge in photovoltaic (PV) renewable energy usage, concerns remain whether or not PV modules induce a “heat island” (PVHI) effect in Singapore. Prior works on the PVHI have been mostly based upon simulated models or experimented in temperature zones. Henceforth, this dissertation proposes a combination of simulation and experimental approach to PVHI effects in tropical city, Singapore. Through collecting data on maximum, minimum and average temperature of various test subjects such as green roof, flat roof and PV modules. The study focuses on investigating PV’s impact on surface temperature under common roof conditions in the country. Deducing the prevalence of the PVHI effect and comparing the various PV modules’ extent to contributing to this phenomenon. confirm the impact of PV module roof application on urban thermal environment. This paper supports the prevalence of PVHI on the roof surface, shown through an approximate 1~2 hours delayed temperature surge experienced by roof after PV panel surface temperature reach its maximum. Also, Poly-si modules are most likely to display PVHI effects due to its comparatively lower insulation and absorptive coefficient. Key findings were consistent on both rainy and sunny days. Furthermore, the surface temperature disparity between the tested subjects were most significant during daytime. However, the results not be representative for temperate regions. To note, during 17th October 2017 to 1st November 2017, the data from the green roof was disrupted due to external conditions.