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An economic and primary energy savings analysis of 2-spool humidified mGTs for domestic applications

Winand, Alexandre
(2023)

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Details

Supervisors
Contino, Francesco
Faculty
Ecole polytechnique de Louvain
Degree label
Master [120] : ingénieur civil électromécanicien, à finalité spécialisée: énergie
Abstract
As the energy systems move from centralized to decentralized energy systems, this thesis assesses the economic viability of efficient humidified micro Gas Turbine (mGT). This mGT uses a wet mode to effectively generate electricity and heat, decoupling their production and enhancing flexibility. By operating in cogeneration mode during high heat demand and recovering heat from the exhaust gases during low demand to increase the electrical efficiency, they ensure year-round operation, unlike conventional technologies. An economic model, incorporating hourly heat and electricity demands across various regions, evaluates profitability using Net Present Value (NPV) and Internal Rate of Return (IRR). Comparative analysis against Internal Combustion Engine (ICE) and mGT in dry mode reveals the advantages of this humidified mGT, particularly in Spain. Sensitivity analysis highlights electricity and gas prices as crucial factors, while policies and subsidies significantly influence profitability. The effects of cogeneration policies in Spain and Belgium is assessed to show that it can enhance the economic feasibility of the different technologies, especially in Spain. The impact of the price at which produced electricity is sold to the grid is evaluated through the electricity price factor. This factor plays an important role in the profitability of the humidified mGT as it produces, in general, more electricity than used on-site. The study also examines Primary Energy Savings (PES), indicating positive results for all technologies, with dry mGT leading due to higher global efficiency. Ultimately, the research demonstrates that the economic potential of humidified mGT depends on demand profiles, energy prices, electricity price factors, and policies. As energy systems evolve, humidified and efficient mGT emerge as a promising solution, particularly in regions like Spain, aligning with the shift towards decentralized energy systems.