Self-sufficient design of building thermalenvironment in low latitude island region

Low-latitude island regions face significant energy challenges due to their extreme hot-humid climates and remote locations. This research proposes a self-sufficient solution that combines passive design strategies with photovoltaic solar roof collection to solve the energy supply problem arising from the thermal environment of buildings in low-latitude island regions. The results of the study show that integrated passive design strategies such as external shading, thermal insulation, double glazing, and double skin roof combined with natural ventilation can reduce the energy consumption of air-conditioning in buildings by 30.95 %; integrated passive design can increase the self-sufficiency rate of a building from 13 % to 172 %; and office buildings with three-floor structure can effectively balance the energy supply and demand within the building. These research findings provide practical and feasible energy solutions for low-latitude island regions, effectively balancing indoor thermal comfort needs and energy supply challenges. • The energy-saving potential of passive technology in low latitudes is analyzed. • Power supply for buildings with roof photovoltaic system to achieve self-sufficiency. • Comprehensive passive design can reduce building energy consumption by 30.95 %. • Comprehensive passive design increased the self-sufficiency rate from 13% to 172 %.