Enhancing Geothermal Energy Utilization Through Binary Power Plant and Absorption Chiller Technology: Songa Wayaua Case
Keywords:
Geothermal Energy, Absorption Chiller System, Organic Rankine Cycle, Songa WayauaAbstract
The Songa Wayaua Geothermal Power Plant (PLTP) is planned for development with a 2x5 MW capacity using single-flash technology. The residual energy contained in the brine from the separator outlet can be further utilized before being reinjected. Referencing a study by PT. PLN (Persero), the brine stream from the single-flash plant, with a mass flow rate of 29.33 kg/s and a temperature of 164.9°C, will be directed into a cascaded system. This system comprises an Organic Rankine Cycle (ORC) for additional power generation and a Lithium Bromide-Water (LiBr-H₂O) absorption chiller for cooling purposes. This approach is particularly promising given the Songa Wayaua geothermal field's coastal proximity, making it suitable for future applications like fish refrigeration systems. The proposed design is projected to generate an additional 312.17 kW of power using Pentafluoropropane (R-245fa) as the working fluid. The ORC system's outlet temperature is maintained at a maximum of 125°C, allowing it to be subsequently used as the heat source for the absorption chiller. This chiller is estimated to produce a cooling capacity of 835.91 kW, with a Coefficient of Performance (COP) of 0.76 and an effectiveness (e) of 0.78. The results of this study indicate that the proposed system can significantly increase the overall energy efficiency and expand the application scope of the geothermal potential. This allows for the direct integration of geothermal energy with the local fishery industry, fostering a direct, mutually beneficial relationship between PT. PLN (Persero) and the community surrounding Songa Wayaua.
Downloads
References
PT. Perusahaan Listrik Negara, “Rencana Usaha Penyediaan Tenaga Listrik 2025 - 2034,” PT. Perusah. List. Negara, pp. 2019–2028, 2019.
PT. Perusahaan Listrik Negara, “PRE-FEASIBILITY STUDY OF SONGA-WAYAUA GEOTHERMAL WORKING AREA FINANCED BY PLN,” no. April, 2020.
F. . Ahangar, “Feasibility Study of Developing a Binary Power Plant,” Geotherm. Train. Program., no. 6, p. 24, 2012.
G. E. E. Dela Cruz and M. C. E. Manuel, “A Literature Review of the Kalina Cycle and Trends,” IOP Conf. Ser. Earth Environ. Sci., vol. 1046, no. 1, 2022, doi: 10.1088/1755-1315/1046/1/012011.
S. Alabd Mohamed and M. Nawab Karimi, “Simulation of Lithium Bromide-Water (LiBr-H2O) Vapor Absorption System (VAS) powered by Solar Flat Plate Collector (SFPC),” IOP Conf. Ser. Mater. Sci. Eng., vol. 691, no. 1, 2019, doi: 10.1088/1757-899X/691/1/012031.
S. Khosravi, N. B. Desai, F. Haglind, and A. Arabkoohsar, “Techno-economic analysis of partial evaporation and sub-critical organic Rankine cycle systems integrated with an absorption heat transformer,” Energy, vol. 326, p. 136366, 2025, doi: 10.1016/j.energy.2025.136366.
M. El Haj Assad, M. Tawalbeh, T. Salameh, and A. Al-Othman, “Thermodynamic analysis of lithium bromide absorption chiller driven by geothermal energy,” 5th Int. Conf. Renew. Energy Gener. Appl. ICREGA 2018, vol. 2018-Janua, pp. 76–81, 2018, doi: 10.1109/ICREGA.2018.8337607.
A. Standard, “ASHRAE Handbook 2009 Fundamentals (SI Edition),” Ashrae Stand., pp. 24–25, 2009.
B. T. Prasetyo et al., “The integrative use of binary cycle technology to improve thermal efficiency and efficiency in geothermal power plants: A case study of Ulumbu geothermal power plant in Indonesia,” Energy Convers. Manag., vol. 321, no. June, p. 119033, 2024, doi: 10.1016/j.enconman.2024.119033.
I. H. Bell, J. Wronski, S. Quoilin, and V. Lemort, “Pure and pseudo-pure fluid thermophysical property evaluation and the open-source thermophysical property library coolprop,” Ind. Eng. Chem. Res., vol. 53, no. 6, pp. 2498–2508, 2014, doi: 10.1021/ie4033999.
C. Maragna, A. Altamirano, B. Tréméac, F. Fabre, L. Rouzic, and P. Barcellini, “Design and optimization of a geothermal absorption cooling system in a tropical climate,” Appl. Energy, vol. 364, no. March, 2024, doi: 10.1016/j.apenergy.2024.123102.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2025 ITB Graduate School Conference
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
