Study on Cascaded Direct Use Application Using Geothermal Fluids in Wayang Windu Field

Abstract

The energy from the brine at Wayang Windu geothermal power plant that is coming from the separator can still be utilized prior to reinjection. Tapped brine at 3.33 kg/s flow rate and 149 oC at output system will flow to cascading system consisting of several application, arranged in order from high to low temperature based on the application. The selection of direct use application was based on best potential commodities in Pangalengan region using Analytical Hierarchy Process (AHP) method. From the nine potential commodities, the three applications with the highest rank selected were coffee drying, chicken egg hatching, and tilapia aquaculture pond. The optimum parameter for coffee drying is 50oC for temperature with 12% moisture content. Whereas chicken egg hatching consist of two rooms which temperature is maintained at 40oC, each with relative humidity of 55% and 70%. For tilapia aquaculture pond, water temperature kept at 30 oC. Based on the thermodynamic calculation, the energy needed for each application is 38.39 kW for 1,000 kg coffee, 47.32 kW for 1,000 chicken eggs and 33.46 kW for 400 kg tilapia fish. Therefore, the energy required for whole cascading system is 119.17 kW.