Simulation, Optimization, Dynamic an‎d 4E Analyses of a Multigeneration System producing Power, Heat an‎d Green Methane

9/21/2026 12:00:00 AM

The escalating environmental challenges stemming from the rising concentration of greenhouse gases in the Earthʹs atmosphere have driven researchers toward investigating multi-generation systems based on renewable energy sources. In this context, this study proposes a novel multi-generation system leveraging biomass an‎d solar energy, capable of producing heat, electricity, an‎d green methane. The system integrates advanced components, including a supercritical carbon dioxide cycle, an s-Graz power cycle, an‎d a thermochemical energy storage subsystem utilizing the reversible calcium carbonate/calcium oxide reaction, enabling continuous 24-hour operation. Through comprehensive energy, exergy, economic, an‎d environmental analyses, along with parametric an‎d dynamic eva‎luations, it was determined that the systemʹs exergy efficiency reaches 33.99% an‎d 49.87% during day an‎d night operations, respectively. The system achieves an internal rate of return of 20.53%, a levelized cost of electricity of 8.01 cents per kilowatt-hour, an‎d a simple payback period of 6.03 years. Additionally, it mitigates carbon dioxide emissions by 429.27 kg/h during the day an‎d 345.13 kg/h at night. Optimization results further indicate that, under optimal conditions, the system can generate an average of 3.56 MW of electricity with an exergy efficiency of 44.04% an‎d a total cost rate of $610.16 per hour. By integrating renewable resources an‎d innovative carbon reuse technologies, this system offers a practical solution for low-emission multi-generation energy production.

چرخه اس-گراز , ذخيره‌سازي ترموشيميايي انرژي , توليد متان , ميدان هليوستات , تحليل 4E

S-Graz cycle , Thermochemical energy storage , Methanation , Heliostat field , 4E analysis

Arman Adouli

Ayat Gharehghani