Energy performance and decarbonization evaluation of a novel positive energy building using solar PV

Positive Energy Buildings (PEBs) are vital for reducing energy consumption and promoting renewable energy. This study introduces a progressive method to evaluate the energy performance and decarbonization of a PEB warehouse in Central Taiwan, utilizing Building Integrated Photovoltaic (BIPV) fa & ccedil;ades and recycled coal ash concrete. The research analyzes building energy performance and renewable energy generation through energy modeling, considering different ventilation configurations and BIPV arrangements. The findings emphasize that a VRF cooling system saves 16.39% energy compared to a chiller system. The study also revealed that improving the arrangement of BIPV on the building fa & ccedil;ade significantly enhances solar energy generation efficiency even with fewer photovoltaics (PVs). The decarbonization aspect is evaluated by estimating the embodied carbon and CO2 emissions during the operational period. The PEB is projected to have a 70-year operational lifespan, functioning as a PEB for approximately 42 years, a Net Zero Energy Building (NZEB) for the following 10 years, and maintaining energy efficiency for an additional 20 years. The BIPV system enables the building to remain carbon-free for up to 50 years of operation and achieve substantial carbon savings, with 90% CO2 emissions reduction after 70 years, amounting to 243,111 kgCO2e/year. The study concludes that adequate maintenance and preservation can significantly enhance building performance and longevity.