TY - JOUR

T1 - Exergy analysis and optimization of Dieng single-Flash geothermal power plant

AU - Pambudi, Nugroho Agung

AU - Itoi, Ryuichi

AU - Jalilinasrabady, Saeid

AU - Jaelani, Khasani

N1 - Funding Information:
The authors would like to thank PT Geodipa Energy for their support in our research activities on the Dieng power plant and for the data provided. The authors would also like to thank the GCOE program at Kyushu University for their financial support.

PY - 2014

Y1 - 2014

N2 - Exergy analysis and optimization of a single-flash geothermal power plant are conducted by developing a mathematical model that is applied to the Dieng geothermal power plant in Indonesia. Calculations are conducted by using the Engineering Equation Solver (EES) code using methods based on the laws of thermodynamics. The exergy flow and efficiency are computed at several plant components, including the separator, turbine, condenser, and for the whole power plant. The exergy of the geothermal fluid that is discharged from the production wells is estimated to be 59.52 MW. This amount of fluid produces 21.71 MW of electricity from the power plant overall, with second law efficiency to be 36.48%. There is a considerable amount of waste brine, amounting to 17.98% (10.70 MW) of the total available exergy, which is disposed of in the plant's reservoir. The optimization of the plant is carried out by adjusting the separator pressure. The results show that a slight increase of 20 kW in the output power can be attained by lowering the separator pressure to 9 bar from 10 bar. The Grassmann diagram shows the exergy losses at each component in the power plant. The turbine and separator losses are 7.51 MW (12.62%) and 8.04 MW (13.5%), respectively, while the cooling tower has an exergy loss of 2.62 MW (4.40%). The total condenser loss is 5.8 MW (9.75%).

AB - Exergy analysis and optimization of a single-flash geothermal power plant are conducted by developing a mathematical model that is applied to the Dieng geothermal power plant in Indonesia. Calculations are conducted by using the Engineering Equation Solver (EES) code using methods based on the laws of thermodynamics. The exergy flow and efficiency are computed at several plant components, including the separator, turbine, condenser, and for the whole power plant. The exergy of the geothermal fluid that is discharged from the production wells is estimated to be 59.52 MW. This amount of fluid produces 21.71 MW of electricity from the power plant overall, with second law efficiency to be 36.48%. There is a considerable amount of waste brine, amounting to 17.98% (10.70 MW) of the total available exergy, which is disposed of in the plant's reservoir. The optimization of the plant is carried out by adjusting the separator pressure. The results show that a slight increase of 20 kW in the output power can be attained by lowering the separator pressure to 9 bar from 10 bar. The Grassmann diagram shows the exergy losses at each component in the power plant. The turbine and separator losses are 7.51 MW (12.62%) and 8.04 MW (13.5%), respectively, while the cooling tower has an exergy loss of 2.62 MW (4.40%). The total condenser loss is 5.8 MW (9.75%).

UR - http://www.scopus.com/inward/record.url?scp=84888870575&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84888870575&partnerID=8YFLogxK

U2 - 10.1016/j.enconman.2013.10.073

DO - 10.1016/j.enconman.2013.10.073

M3 - Article

AN - SCOPUS:84888870575

SN - 0196-8904

VL - 78

SP - 405

EP - 411

JO - Energy Conversion and Management

JF - Energy Conversion and Management

ER -