Perpustakaan Digital ITB

This study investigates the performance and economics of closed-cycle OTEC systems with various modifications. Four modifications are analyzed, including the addition of a separator, an additional turbine, a reheater, and a regenerator. Additionally, a desalination system is incorporated into some modifications to assess its economic viability. The results show that the modeling method is accurate, with errors below 3%. Among the modifications, Modification One: Closed-cycle with Desalination System and Modification Three: Adding Reheater, Turbine, and Desalination System exhibit the best performance. Modification One generates 15.603 MW without desalination and 13.019 MW with desalination, with efficiencies of 2.093% and 1.746%, respectively. Modification Three generates 16.087 MW without desalination and 13.667 MW with desalination, with efficiencies of 2.105% and 1.788%, respectively. Due to its superior performance, Modification One is selected for further economic analysis. The LCOE for Modification One was 0.142 $/kWh without desalination and 0.226 $/kWh with desalination. The Payback Period for Modification One is fastest when the electricity sales price is set at 0.1925 $/kWh without desalination and 0.3 $/kWh with desalination. These findings suggest that closed-cycle OTEC systems with modifications, particularly Modification One, have the potential to be a viable and economical renewable energy source.