Journal of Energy Storage, cilt.166, 2026 (SCI-Expanded, Scopus)
Innovative building envelopes made from advanced materials play a critical role in improving energy performance by enhancing the effective thermal mass of buildings within passive design strategies. This study proposes a passive wall system integrating transparent insulation material (TIM) with a PCM-embedded brick wall (TIM-AG-PCM wall) to improve building thermal performance during both heating and cooling seasons. The innovative wall system was initially configured through mathematical analysis, and its alternative wall system configurations were experimentally compared under the continental climatic conditions of Ankara using instantaneous measurement data to determine the highest-performing configuration. The selected system was subsequently integrated at the building scale and modeled parametrically for each facade with application ratios ranging from 20% to 100%. For each ratio, energy performance and cost data were obtained and normalized to determine the optimum application ratios. The results indicate that applying the TIM-AG-PCM wall at ratios of 35–40% on the south facade, 50% on the north facade, and 50–60% on the east and west facades provides an optimal balance between thermal performance and cost, offering a sustainable and efficient design solution for building envelopes. At these optimum ratios, building energy consumption was reduced by 25.8% compared to a conventional wall system. Annual analyses further reveal that the hybrid use of two PCMs with different melting temperatures, selected for heating and cooling seasons, supports continuous thermal regulation during transitional periods.