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 the working fluid turns into a vapor phase, it flows into a gas turbine to generate electricity. For this situation, the n-pentane working liquid is chosen by considering the tension circumstances in the intensity exchanger, n-pentane still passes its basic temperature until it becomes superheated condition. The thermodynamic pattern of the n-Pentane working liquid beginning from the power source of the feed siphon, and utilizing a tension of 10 bar and a temperature of 30oC with a mass stream pace of 1.5 kg/sec, is siphoned into the intensity exchanger. Resulting to being warmed by the warming fluid, the working fluid changes into superheated gas and enters the gas turbine with a temperature of 71.85oC, and a kind of 1.1 bar, which will have an enthalpy of 645 kJ/kg. If it is set at the gas turbine outlet, the enthalpy condition is 560 kJ/kg, then, at that point, using the n-Pentane working fluid will make 127.5 kW or 0.1275 MW of electrical energy. This assessment can be used as a model for the usage of hot fluid from suspension wells that are not commonly used for power plants with steam turbines, it just so happens, using a twofold cycle can convey sufficient and productive electrical power