| Penulis/Author |
Fefria Tanbar (1); Rusdi Febriyanto (2); Dr. Ir. Hifni Mukhtar Ariyadi, S.T., M.Sc., IPM (3) ; Ariyana Dwiputra Nugraha (4); Arionmaro Asi Simaremare (5); Eko Supriyanto (6); Meiri Triani (7); Ir. Muhammad Akhsin Muflikhun, S.T., MSME., Ph.D (8) |
| Abstrak/Abstract |
With global decarbonization trends, the energy supply challenge persists, especially in archipe
lagic nations like Indonesia. The Ulumbu Geothermal Power Plant at Flores Island of Indonesia
currently uses a type of back pressure where the expanded steam is discharged directly to the
atmosphere at a pressure of 0.98 bar and a temperature of 98.7
◦
C. This steam could be harnessed
to generate electrical energy using Organic Rankine Cycle system. This study thermodynamically
and economically assessed two ORC systems: Binary Cycle-Organic Rankine Cycle (BC-ORC) and
Recuperator (BC-ORCR), both using low global warming potential (GWP) working fluids of
R1233zd (E), R1224yd (Z), R1234ze (Z), R1234ze (E), R1243zf, and R1234yf, paired with air
and water-cooled condensers. The results indicate that the BC-ORCR system with a water-cooled
condenser using R1233zd (E) as the working fluid achieved the highest net output power value
and system efficiency of 2213 kW and 10.14 %, respectively. This could support up to 65 % of the
electricity load of the GI Ulumbu and GI Ruteng substations. Economically, this system also
emerged as the most favorable option, offering the highest production capacity, with a TL Sales
Target of 16,476,847 USD, a net present value (NPV) of 3,982,761 USD and a Payback Period of
9.39 years, outperforming other systems in the analysis. |
