Thermoeconomic Study of a Multigeneration System with Waste Heat Recovery from a Gas Turbine

Document Type : Research Paper

Authors

Department of Mechanical Engineering, Engineering Faculty, Urmia University, Urmia, Iran

Abstract

The growing demand for energy and the associated crisis present a major global challenge. As a result, there is an increasing shift towards the adoption of renewable energy sources. One effective strategy to reduce fossil fuel consumption is to capture heat from the exhaust gases produced by gas turbines. This approach not only reduces fuel consumption but also lowers carbon dioxide emissions, contributing to environmental protection. A study was conducted to evaluate the energy, exergy, and exergoeconomic aspects through a simulation of a combined cycle system, which integrated a steam Rankine cycle (SRC) and an organic Rankine cycle (ORC) to utilize waste heat from gas turbines. Freshwater and hydrogen were produced using a reverse osmosis (RO) unit and a proton exchange membrane (PEM) electrolyzer. The impact of varying system parameters on performance factors was thoroughly investigated. System analysis was conducted using EES software. The results showed that the initial energy efficiency and overall exergy values were 24.92% and 15.01%, respectively, with an output work of 320,412.8 kW. Additionally, replacing the SRC and ORC condensers with two thermoelectric generator (TEG) units resulted in an additional power output of 5,046.8 kW. Exergy destruction rate assessments indicated that the gas turbine (GT) and SRC cycles exhibited the highest levels of exergy destruction.

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References

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Hydrogen, Fuel Cell & Energy Storage
Volume 12, Issue 4
December 2025
Pages 265-274

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