Performance n-Pentane in Geothermal Medium Enthalpy Binary Cycle for Electric Power Small Scale

Abstract

Hot fluids from unproductive wells can be used as geothermal energy for small-scale power plant utilization. Low temperature and small flow rate are the reason of wells being suspended. Electrical energy can be calculated on a small scale, as case of Well DLSM-2. This well was chosen since it has 150°C temperature with pressure of 10.5 bar which can use a medium enthalpy turbine. The heating fluid from wellhead flowed inside heat exchanger to heat up the n-pentane as working fluid. After turning into a vapor phase, the working fluid is flow into gas turbine to produce electricity. On this case, the n-pentane working fluid is chosen in consideration of under pressure conditions in the heat exchanger, n-pentane still pass its critical temperature until becomes superheated. The planning thermodynamic cycle starts from the feed pump outlet, and using pressure and temperature assumptions to make it easier to reach. By using the n-pentane working fluid it produces 127.5 kW or 0.1275 MW of electrical energy. This research can be used as a model of hot fluid from suspended wells that are no longer produced turns out to produce sufficient and economical electric power.

Keywords

Binary Cycle, Electric Power, Heating Fluid, Medium Temperature, N-pentane

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