TY - JOUR

T1 - Exergy analysis and exergoeconomic optimization of a binary cycle system using a multi objective genetic algorithm

AU - Nasruddin, null

AU - Nasution, Syaiful

AU - Aisyah, Nyayu

AU - Surachman, Arief

AU - Wibowo, Agung Satrio

N1 - Funding Information:
The authors gratefully acknowledge DRPM Universitas Indonesia for supporting this research with a PITTA Research Grant 2017 No: 817/UN2.R3.1/HKP.05.00/2017.
Publisher Copyright:
© IJTech 2018.

PY - 2018/4/1

Y1 - 2018/4/1

N2 - The increasing demand for energy and the current environmental issues are motivating experts to develop appropriate technology to face both problems. The binary cycle system is a highly effective generating technology which can be applied in the utilization of small-scale geothermal energy by using a working fluid that has a lower boiling point than water. In this paper, a geothermal power plant binary cycle system model was tested by using waste brine at a temperature of 180°C at well pad 4 of the Dieng geothermal power plant. In the optimization procedure, total exergy destruction and total annual cost are chosen as the objective functions. Optimization is made by using a multi objective genetic algorithm. Based on the simulation, it is known that the exergy efficiency and economic value of the optimal binary cycle of the geothermal power plant system has optimum conditions at an evaporation temperature of 163.3°C, a brine temperature in the preheater outlet of 130°C, and a water cooling temperature at condenser outlet of 35.4°C. The working fluid pressure at pump outlet is 3859 kPa with the composition of the working fluid mixture being 86% R601 and 14% R744, resulting in turbine power of 119.8 kW, total exergy destruction of 742.4 kW, and a total annual cost of 36,723 US dollars. These results indicate that, by setting the above operating conditions, the system can achieve optimum efficiency, as indicated by the minimum values of both exergy destruction and total annual cost.

AB - The increasing demand for energy and the current environmental issues are motivating experts to develop appropriate technology to face both problems. The binary cycle system is a highly effective generating technology which can be applied in the utilization of small-scale geothermal energy by using a working fluid that has a lower boiling point than water. In this paper, a geothermal power plant binary cycle system model was tested by using waste brine at a temperature of 180°C at well pad 4 of the Dieng geothermal power plant. In the optimization procedure, total exergy destruction and total annual cost are chosen as the objective functions. Optimization is made by using a multi objective genetic algorithm. Based on the simulation, it is known that the exergy efficiency and economic value of the optimal binary cycle of the geothermal power plant system has optimum conditions at an evaporation temperature of 163.3°C, a brine temperature in the preheater outlet of 130°C, and a water cooling temperature at condenser outlet of 35.4°C. The working fluid pressure at pump outlet is 3859 kPa with the composition of the working fluid mixture being 86% R601 and 14% R744, resulting in turbine power of 119.8 kW, total exergy destruction of 742.4 kW, and a total annual cost of 36,723 US dollars. These results indicate that, by setting the above operating conditions, the system can achieve optimum efficiency, as indicated by the minimum values of both exergy destruction and total annual cost.

KW - Binary cycle system

KW - Cost

KW - Exergy destruction

KW - Exergy efficiency

KW - Genetic algorithm

UR - http://www.scopus.com/inward/record.url?scp=85046866115&partnerID=8YFLogxK

U2 - 10.14716/ijtech.v9i2.1040

DO - 10.14716/ijtech.v9i2.1040

M3 - Article

AN - SCOPUS:85046866115

VL - 9

SP - 275

EP - 286

JO - International Journal of Technology

JF - International Journal of Technology

SN - 2087-2100

IS - 2

ER -