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Energy efficient ships


VTT presents a novel ship energy flow simulation platform to holistically design and operate ships more energy efficiently and environmentally friendly. With the well-proven benefits to our partners, we provide partners and customers concept-to-delivery solutions in various applications to

  1. efficiently design and retrofit ship energy systems based on partners’ requirements and ship operating profiles, such as energy system conceptual design and optimization, component optimization and dimensioning
  2. truly understand and monitor the main energy systems and clearly identify energy-saving potentials of specific energy systems
  3. easily test and evaluate novel technologies on ship-level energy saving potentials under real operating conditions, and calculate their return-on-investment to support business critical decisions
  4. effectively manage and operate ships in real time at their globally optimal energy efficiency, and guide and optimize their life-cycle operation with fleet management SEEMP integration


​​To cope with the different levels of complexity at different phases throughout ship’s life cycle, VTT presents a multi-level methodology to interactively design and operate complex ship energy systems under real dynamic conditions during the design and operation processes. This is enabled via a unified integration, simulation and optimization platform, aiming not to operate local energy subsystems at their highest efficiency but to operate the energy systems at the plant level to achieve the best performances.

1. Modular platform

The platform is modular and fully configurable and scalable, and can be easily utilized for various applications of all ship types. Several physical domain libraries including all the main components of ship energy systems have been developed ready for use. All the components are developed as simple but feasible as possible to facilitate the physical interactions among different subsystems using multi-domain modelling methods.

2. Advanced methodology

To unify the different processes in the platform, advanced technologies have been employed to model, simulate, analyse and optimise ship energy systems so as to achieve globally optimal design and operation performances.

  • Energy system integration
  • Multi-objective optimization
  • Model identification and validation
  • Techno-economic-environmental analysis
  • Real-time tracking, prediction and optimization


Example 1 – Modern Large Luxury Cruise Ship

  • System-level energy system representation
  • Data-based model simulation and validation
  • Ship-level energy efficiency analysis
  • System-level energy system optimization
  • Prediction-based operation optimization





Example 2 – Modern Very Large Container Ship

  • System-level energy system representation
  • Data-based model simulation and validation
  • Model-based retrofitting optimization
  • Advanced waste heat recovery integration
  • Techno-economic-environmental analysis



Guangrong Zou, Mia Elg, Aki Kinnunen, Panu Kovanen, Kari Tammi,Kalevi Tervo. Modeling ship energy flow with multi-domain simulation, Proc. CIMAC 2013

Guangrong Zou, Aki Kinnunen, Kari Tammi, Kalevi Tervo, Juha Orivuori, Klaus Vänskä, Evaluate Ship Energy Saving Scenarios Using Multi-Domain Energy Flow Simulation, COMPIT 2014.

Mia Elg, Su Len Quach, Aki Kinnunen, Guangrong Zou, Kari Tammi, Improvements in Machinery Design of a Bulk Carrier by utilizing Multi-Domain Energy Flow Simulation, COMPIT 2014.

Mathworks user story, ABB, Deltamarin and VTT Simulate and optimize ship energy flows, 2014.