Integrated biomass gasification combined cycles can be advantageous for providing multiple products simultaneously. A new electricity and freshwater generation system is proposed based on the integrated gasification and gas turbine cycle as the main system, and a steam Rankine cycle and multi-effect desalination system as the waste heat recovery units. To evaluate the performance of the system, energy, exergy, and economic analyses were performed. Also, a parametric analysis was performed to assess the effects of various parameters on the system’s performance criteria. The economic feasibility of the plant was analyzed in terms of net present value. For the base case, the performance metrics are evaluated as Wnet=8.347 MW, ε=46.22%, SUCP=14.07 $/GJ, and mfw=11.7 kg/s. Among all components of the system, the combustion chamber is the greatest contributor to the exergy destruction rate, at 3250 kW. It is shown with the parametric analysis that raising the combustion temperature leads to higher electricity and freshwater production capacity. For a fuel cost of 2 $/GJ and an electricity price of 0.07 $/kWh, the total net present value at the end of plant’s lifespan is 6.547×106 $, and the payback period is 6.75 years. Thus, the plant is feasible from an economic perspective.

This study developed an inverse design algorithm called Ball-Spine Algorithm (BSA) as a quasi-3D method and applied it to the meridional plane of a centrifugal pump impeller in an e ort to improve its performance. In this method, numerical analyses of viscous ow eld in the passage between two blades were coupled with BSA to modify the corresponding hub and shroud geometries. Here, full 3D Navier-Stokes equations were solved on a thin plane of ow instead of solving inviscid, quasi-3D ow equations on the meridional plane. To demonstrate the validity of the present work, the performance of a centrifugal pump was numerically investigated rst and then, it was compared with available experimental data. After de ning a target pressure distribution on the hub and shroud surfaces of the ow passage, a new impeller geometry was then obtained in accordance with the modi ed pressure distribution. The results indicated a good rate of convergence and desirable stability of BSA in the design of rotating ow passages with incompressible, viscous ows. Overall, the proposed design method gave rise to the following major improvements: an increase in static pressure along the streamline, a 5% increase in the pump total head, and delay in the onset of ow cavitation inside the impeller.