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Energy system and process modelling

Versatile use of digital models of energy systems and processes benefits their life cycle phases, such as design, manufacturing, construction, operation, maintenance, dismantling and recycling. 

The very recent development trends in the energy sector, including emissions trading, upgrades of present production plants, developments of completely new plant designs and distributed energy production, including wind energy, require increased use of computerised modelling and simulation to back up traditional engineering work practices.

VTT has long experience in using various kinds of computerised models of energy systems and processes. Steady state flow sheeting models are used for optimisation of the thermal efficiency of power plants and district heating networks. Dynamic models are used for optimisation of control system design and operational procedures. Comprehensive analysis models are used for safety evaluation of nuclear power plants. Three-dimensional models are used for detailed analysis of combustion chambers and nuclear reactors. Augmented reality models are used for planning of the sequence of assembly of plant equipment. Integrated energy supplier and consumer models are used for studies of both district heating and electrical networks. System dynamics models are applied to short-term production planning, as well as long-term asset management. In addition, we develop our own system models and scenario analyses for emissions calculations, economic models and global and regional techno-economy models of energy systems. We also have models for actors on the electricity market, from load modelling, load forecasting, and procurement optimisation to commercial balance management and trade support.

We make use of well-known commercial modelling tools such as Vensim, Aspen, Fluent, PSS®E, and ChemApp; however, we also develop our own tools. ChemSheet has been developed for linking rigorous multiphase thermodynamic calculations of ChemApp through EXCEL spreadsheets. BALAS is intended for efficient flow sheeting analysis, with numerous applications for both power plants and pulp and paper mills. APROS Nuclear was initially developed for detailed dynamic analysis of nuclear power plants. APROS Combustion was developed for fossil fuel and biofuel burning conventional power plants, including combined cycle applications. In addition, APROS Paper was developed for pulp and paper mill applications.


Additional information

Kaj Juslin
Customer Manager
+358 20 722 6422