Analysis of Potential Utilization of Sarulla Geothermal Combined Cycle Residual Fluids for Direct Use in The Coffee Industry

Jonius Christian Harefa; Hadiyanto; Udi Harmoko

doi:10.21771/jrtppi.2022.v13.no2.p37-50

Authors

Jonius Christian Harefa Universitas Diponegoro
Hadiyanto Chemical Engineering, Diponegoro University
Udi Harmoko Department of of Physics, Diponegoro University

DOI:

https://doi.org/10.21771/jrtppi.2022.v13.no2.p37-50

Keywords:

Geothermal, Energy, Exergy, Sarulla, Coffee

Abstract

The Geothermal Power Plant is one of the new renewable energy power plants. In Indonesia, the realization has reached 2%. Sarulla Operations Limited is the first geothermal power plant in Indonesia, located in North Tapanuli Regency, that utilizes combined cycle technology. Coffee is the leading commodity in the North Tapanuli district, with a plant area of 17,586 hectares. Coffee is dried in the traditional way (open field drying) so that it is still constrained by rain and cloudiness and can only be done during the day. The reinjection well fluid has a temperature of 103^°C with a flow rate of 4978 t/h and a pressure of 6–14 Bar. This study analyses the residual fluid energy for coffee drying purposes. Energy and exergy calculations are done manually and using DWSIM software with a total of 24 data points 24 hours a day to represent the availability of dryers both day and night. The results showed that the most energy needed to raise the drying air temperature at night from 15°C to 60°C was 125.62 kW, while the lowest energy needed to raise the drying air temperature during the day from 30°C to 40°C was 27.92 kW. The results of research calculations show the energy potential for residual fluid from geothermal plants to be used for drying coffee for 24 hours, both day and night.

References

Abdulaziz, A. (2020). Analisis Energi dan Eksergi Terhadap Komponen Utama PLTU Unit 3 Sebelum dan Sesudah Overhaul di PT. Indonesia Power Banten 3 Lontar OMU, 33. Retrieved from http://156.67.221.169/3203/

Ahmad, A. H., Adityatama, D. W., Rusdianto, M. A., Pradana, G. M., Beryll, T. A., Prasetyo, P. V., & Rachmadani, A. (2021). Potential Alternatives for Geothermal Direct Use in Mataloko to Increase Public Acceptance Country United States New Zealand Indonesia, 2025(July), 1–14.

Ariawan, A. M., Windarta, J., & Dwiatmoko, S. (2022). Rooftop PV Plant Development Planning at the Central Java Provincial DPRD Secretariat Office. Jurnal Riset Teknologi Pencegahan Pencemaran Industri, 13.

Australian Academy of Science. (2015). Feeling the heat: geothermal energy. Retrieved from https://www.science.org.au/curious/technology-future/feeling-heat-geothermal-energy

Bergman, T. L., & Lavine, A. S. (2017). Fundamentals of Heat and Mass Transfer (8th ed., Vol. 59).

BMKG. (2022). Stasiun Meteorologi Silangit. Retrieved from https://dataonline.bmkg.go.id/

BPS. (2021). Kabupaten Tapanuli Utara Dalam Angka.

BPTP Lampung. (2018). Teknologi Pascapanen Kopi, Untuk Meningkatkan Mutu Komoditas Unggulan Lampung.

Badan Penelitian dan Pengembangan Pertanian Kementerian Pertanian. Retrieved from www.litbang.deptan.go.id

De Sousa, J., & Domenici Roberto, C. (1998). New Technologies for the Drying of Coffee, 1–17.

Djafar, Z., Piarah, W. H., Djafar, Z., & Riadi, R. (2018). Analisis Prestasi Pengering Kopi Berbasis Bahan Bakar Gas ( LPG ). Prosiding Seminar Ilmiah Nasional Sains Dan Teknologi, 4(November), 399–408.

Fauzi, Z. N., & Widiantoro, H. (2021). Perancangan Mesin Pengering Biji Kopi Semi Otomatis Kapasitas 25 kg.

Finzer, J. R. D., Sfredo, M. A., Sousa, G. D. B., & Limaverde, J. R. (2007). Dispersion coefficient of coffee berries in vibrated bed dryer. Journal of Food Engineering. https://doi.org/10.1016/j.jfoodeng.2006.03.011

Gissurarson, M., & Arason, S. (2018). Geothermal Direct Use. Iceland Geothermal Conference, (April), 75–79.

Gultom, & T., S. S. (2019). Rancang Bangun Dan Pengujian Pengering Biji Kopi Tenaga Listrik Dengan Pemanfaatan Energi Surya. Dinamis. https://doi.org/10.32734/dinamis.v7i4.7201

Hutasoit, P. (2020). Ratusan Massa Demo DPRD Taput, Tuntut PT SOL Tutup, Turunkan Ahli. Retrieved from https://waspada.id/sumut/ratusan-massa-demo-dprd-taput-tuntut-pt-sol-tutup-turunkan-ahli/

IESR. (2021). Indonesia Energy Transition Outlook 2021. Iesr, 1–93.

Kreith, F., Manglik, R. M., & Bohn, M. S. (2011). Principles of Heat Transfer (7th ed.).

Moran, M. J., Shapiro, H. N., Boettner, D. D., & Bailey, M. B. (2014). Fundamentals of Engineering Thermodynamics. https://doi.org/10.7227/ijmee.29.1.2

Mudassir, R. (2021). Punya Potensi Besar, Energi Panas Bumi Masih Kurang Dimanfaatkan di Indonesia. Retrieved from https://ekonomi.bisnis.com/read/20210926/44/1446892/punya-potensi-besar-energi-panas-bumi-masih-kurang-dimanfaatkan-di-indonesia

Nagel, A., Dwiatmoko, S., & Windarta, J. (2022). Soaking Up The Sun: Designing Small Scale Photovoltaic (PV) Rooftop for Micro, Small, and Medium Enterprises (MSME): Study Case at Rattan Crafts Center in Trangsan Village, Sukoharjo, Central Java. Jurnal Riset Teknologi Pencegahan Pencemaran Industri, 13.

Rajput, E. R. K. (2012). Heat and Mass Transfer. India.

Rakhmadi, R., & Sutiyono, G. (2015). Using Private Finance to Accelerate Geothermal Deployment: Sarulla Geothermal Power Plant, Indonesia.

Rame, R., Purwanto, P., & Sudarno, S. (2021). Environmental Critical Aspects of The Conversion of Biomass to Biogas for Sustainable Energy in Indonesia. Jurnal Riset Teknologi Pencegahan Pencemaran Industri, 12.

Sarulla Operation Ltd. (2021). Pilot Test Low Temperature OEC Brine.

Weather Spark. (2022). Iklim dan Cuaca Rata-rata Sepanjang Tahun di Siborong-Borong. Retrieved from https://id.weatherspark.com/y/112714/Cuaca-Rata-rata-pada-bulan-in-Siborong-Borong-Indonesia-Sepanjang-Tahun

Wolf, N. (2015). Sarulla 330 MW geothermal project key success factors in development. Transactions - Geothermal Resources Council, 39, 907–912.

Yani, E., & Fajrin, S. (2013a). Karakteristik Pengeringan Biji Kopi Berdasarkan Variasi Kecepatan Aliran Udara Pada Solar Dryer.

Yani, E., & Fajrin, S. (2013b). Karakteristik Pengeringan Biji Kopi Berdasarkan Variasi Kecepatan Aliran Udara Pada

Solar Dryer. Jurnal Teknika, 20(1), 17–22. Retrieved from https://docplayer.info/31509139-Karakteristik-pengeringan-biji-kopi-berdasarkan-variasi-kecepatan-aliran-udara-pada-solar-dryer.html