Thermo-Economic Analysis of a Geothermal-based Multigeneration System Using the Kalina Cycle for Power, Heating, Cooling, Hydrogen and Freshwater Production

This study presents an in-depth thermodynamic and economic evaluation of a hybrid geothermal energy system utilizing Kalina cycle technology for multipurpose power generation. The system is designed to produce electricity and heating while supplying cooling, hydrogen, and freshwater. The integrated system reaches a total energy efficiency of ۴۷.۶\% and an exergy efficiency of ۴۴.۲%. Raising the high pressure setting in the Kalina cycle to ۴۹۰۰ kPa reduces the exergy destruction cost rate to ۱۴۸۶.۴۹/h, the total cost rate to ۲۴۶۴.۱۲/h, and the capital investment rate to ۹۲۲.۱۲/h, compared to the base pressure of ۴۰۰۰ kPa where these rates were ۱۹۱۲.۰۸/h for exergy destruction and \۳۰۸۴.۰۰/h for total cost and ۱۱۷۱.۹۲/h for capital investment. The exergetic assessment shows Turbine ۲ and the Compressor as the main contributors to system exergy destruction, with outputs of ۲۵۴۵.۳۳ kW and ۲۳۵۳.۰۹ kW, respectively. At a rate of ۰.۱۵۲۴ kg/h the system establishes two operational capabilities: hydrogen production and a cooling output of ۳۴۹۸ kW. The research indicates that the combined multigeneration system enhances resource utilization ofgeothermal energy by maximizing energy efficiency and decreasing operational costs.

کلیدواژه ها:

Geothermal energy ، Kalina cycle ، Multigeneration system ، Thermo-economic analysis ، Hydrogen production