Akademik Veri Yönetim Sistemi
ULUSLARARASI KATILIMLI 25. ISI BİLİMİ VE TEKNİĞİ KONGRESİ (ULIBTK’25), Adana, Türkiye, 10 - 12 Eylül 2025, cilt.1, sa.1, ss.1182-1193, (Tam Metin Bildiri)
his paper presents a comprehensive thermodynamic and exergetic assessment of a multigeneration renewable energy system utilizing advanced, low global warming potential (GWP) new generation refrigerants R1233zd and R1234ze. The proposed configuration is optimized to simultaneously produce electricity and thereby enhancing system efficiency and sustainability. Solar thermal and geothermal sources are integrated as the primary renewable energy inputs, driving multiple interconnected subsystems that include an Organic Rankine Cycle (ORC). The system is evaluated under steady-state operating conditions using thermodynamic simulation tools, focusing on the detailed analysis of energy and exergy flows throughout each subsystem. The thermophysical advantages of R1233zd and R1234ze modern organic working fluids²such as their relatively low boiling points, high thermal stability, and environmentally benign characteristics²are thoroughly examined in the context of their impact on ORC performance and overall system integration since traditional fluids often have high GWP and pose environmental concerns while supporting components are assumed to remain constant across both configurations. The steady-state
thermodynamic model is developed using Ebsilon Professional and Engineering Equation Solver (EES) programmes validated against existing literature data to analyze energy and exergy efficiency and overall system performance while key assumptions include steady-state operation, negligible pressure drops and heat losses in piping and constant ambient temperature. Results indicate that R1233zd offers marginally higher exergetic efficiency under stable, lowtemperature conditions due to superior thermal absorption and expansion behavior comparing with the traditional refrigerants from literature. Furthermore, R1234ze demonstrates greater performance resilience under fluctuating temperature environments, making it particularly well-suited for solar-dominated operations. Both fluids have low GWP and no ozone depletion potential as their integration into renewable systems significantly reduces the carbon footprint compared to conventional setups using R134a or R245fa. Exergy destruction analysis identifies the ORC expander and heat exchangers as principal sources of irreversibility, suggesting potential areas for system enhancement. Overall, this investigation underscores the practical potential of next-generation, environmentally friendly working fluids in enabling high-performance, renewable-driven multigeneration energy systems, with valuable implications for sustainable energy design and deployment. The outcomes of this research aim to guide the optimization and practical implementation of environmentally benign working fluids in renewable-powered multigeneration systems. In doing so, it contributes to advancing sustainable energy infrastructure that meets the growing global demand for clean, efficient, and multifunctional energy solutions since the integration of this newgeneration working fluids R1233zd and R1234ze in a renewable-based multigeneration system demonstrates significant potential for improving exergetic performance, energy efficiency and reducing environmental impact