| Penulis/Author |
Fefria Tanbar (1); RAFAEL PUNGKAS P (2); Ariyana Dwiputra Nugraha (3); Handrea Bernando Tambunan (4); Achmad Nurfanani (5); Wigas Digwijaya (6); Ir. Muhammad Akhsin Muflikhun, S.T., MSME., Ph.D (7); Dr. Ir. Khasani, S.T., M.Eng, IPM., ASEAN Eng. (8); Dr. Ir. Hifni Mukhtar Ariyadi, S.T., M.Sc., IPM (9) |
| Abstrak/Abstract |
Indonesia's current energy landscape predominantly depends on fossil fuels and non
renewable energy sources, thereby exacerbating the issue of global warming. On the other side,
geothermal utilization in the country still needs to be expanded to reduce the dependency on
fossil fuels, particularly through organic Rankine cycle (ORC) systems. As an example, Ulumbu
Geothermal Power Plant in Flores Island currently uses a back pressure turbine, which releases
expanded steam directly into the atmosphere at 98.7°C and 0.98 bar. This paper presents a
thermodynamic analysis of a small-scale Organic Rankine Cycle with 5kW Net power output
based on the waste heat data of the Ulumbu Geothermal Power Plant. The study includes
selecting the working fluid based on Ozone Depletion Potential (ODP) and Global Warming
Potential (GWP) values, thermal efficiency, refrigerant, and steam mass flow rate calculation.
Among 20 refrigerants available in Indonesia, R245fa shows promise, offering a Rankine system
efficiency of 10-11%, zero ODP, a GWP of 850, and the lowest refrigerant mass flow rate. These
parameters inform useful initial parameters for designing a small-scale ORC system producing
5 kW of net power, promoting cleaner and sustainable energy solutions for communities |
