The Electricity Power Potency Estimation from Hot Spring in Indonesia with Temperature 70-80°C Using Organic Rankine Cycle

This paper presents the electricity power potency estimation from hot spring in Indonesia with temperature 70-80 °C using Organic Rankine Cycle (ORC). ORC is a system that able to generate electricity with a low heat source temperature, making it suitable to be used to generate electricity with hot spring as heat source. Organic fluid is used as working fluid in the system. Temperature and volume flow rate of the hot spring is used as the data. The regions to be analyzed are area that has hot springs temperature between 70-80 °C. The cold water temperature to be used in the analysis was assumed 5 °C lower than ambient temperature. R227ea was chosen as working fluid in the system. The analysis begins by calculating hot spring mass flow rate to determine heat input. Analysis was continued by calculating heat output. End of the analysis are determiningturbine power and thermal efficiency. Results of the analysis indicate that Lompio - 1 is the area that has the highest electricity potential compared to other areas with 130.13 kW turbine power and thermal efficiency of 5.71%. Areas that have the lowest electricity potential is Kambahan with 1.14 kW turbine power and 5.63% thermal efficiency.