Department of Mechanical Engineering

Energy Efficiency and Systems

Energy efficiency plays a key role in solving challenges related to developing a sustainable future for human societies, highlighting the need to optimise energy systems of all sizes.
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In the Energy Efficiency and Systems research group, research is focused on energy generation and energy consumption systems. The scale of these systems ranges from single buildings to industrial energy systems and continental energy networks.

Despite the variety of application areas, common research methods provide opportunities for close cooperation between the group's researchers, thus providing the base of knowledge needed for top-level research. This knowledge base also provides possibilities for international research cooperation.

Efficient energy use and indoor climate in buildings, energy- and material-efficient technologies, process concepts and process integration in industry, and optimal energy systems of communities are the key research knowledge in the group. The basis of the research is in the increasing complexity of energy systems and the need to reduce their environmental impact.

The main research tools are different types of analysis, simulation and optimisation methods used in computer software and programs. These computer programs include both leading commercial software and programs created by the group. Experimental methods are also used, focusing on efficient integration of renewable energy in buildings, on drying technology and on measuring the indoor-air quality and performance of energy systems in buildings.

The societal and economic impact of energy technologies is studied by applying system analysis tools to search for ways to integrate renewable energy and to reduce greenhouse gas emissions in energy systems of both industrialised countries like Finland and developing countries. The tools that are utilised include life-cycle approaches, carbon footprint calculation, (primary) energy efficiency analysis, exergy analysis, production simulation and multi-objective optimisation, GIS analysis, investment analysis as well tools for multicriteria decision making. Research is done within national Finnish research programs, the EU’s Horizon programme and in other international research programmes.

The group also studies large transformations of energy systems to reach carbon-neutrality. Medium- and long-term energy system transformations are studied with energy system models, such as EnergyPLAN and EnergyPRO as well as in-house models of electricity markets and demand-side management. The focus of research is on modelling and exploring future developments of national energy systems, city-level heating systems and international electricity markets.

Latest publications

Indoor environmental quality improvement of student dormitories in Tehran, Iran

Nastaran Abdollahzadeh, Azin Velashjerdi Farahani, Kamyar Soleimani, Zahra Sadat Zomorodian 2022 International journal of building pathology and adaptation

Jäähdytyksen mitoituspäivät Suomen ilmastossa

Sami Lestinen, Juha Jokisalo, Risto Kosonen, Natalia Korhonen, Kirsti Jylhä 2022 Sisäilmastoseminaari 2022, Sisäilmayhdistys raportti; no. 40

Experimental study on the effect of 4-way active chilled beam ventilation system on airborne infection risk

Risto Kosonen, Ru Ming, Tuomas Kaukola, Panu Mustakallio, Simo Kilpeläinen, Sami Lestinen 2022

Helle ja ilmastonmuutos asumisterveyden näkökulmasta

Risto Kosonen, Virpi Kollanus, Timo Lanki 2022

Occupant targeting ventilation brings clean air to occupants

Risto Kosonen, Arsen Melikov, Angui Li, Xianting Li, Guangyu Cao, Bin Yang 2022 REHVA Journal

Room systems as a service platform for smart buildings

Risto Kosonen 2022 Smart Buildings and Digitalization

Thermal environment in simulated office rooms generated by 4-way active chilled beams

Risto Kosonen, Panu Mustakallio, Tuomas Kaukola, Simo Kilpeläinen, Sami Lestinen 2022

Performance of Modern Passive Stack Ventilation in a Retrofitted Nordic Apartment Building

Ilia Kravchenko, Risto Kosonen, Juha Jokisalo, Simo Kilpeläinen 2022 Buildings

Effect of biomass-based carbon capture on the sustainability and economics of pulp and paper production in the Nordic mills

Katja Kuparinen, Satu Lipiäinen, Esa Vakkilainen, Timo Laukkanen 2022 Environment, Development and Sustainability

Effects of supply air temperature and pollutant location on concentration characteristics with a night-time ventilation in a school classroom

Sami Lestinen, Panu Mustakallio, Risto Kosonen, Simo Kilpeläinen, Juha Jokisalo 2022 Clima 2022
More information on our research in the Research database.
Research database

Research group members

Sami Lestinen

Tutkijatohtori
T212 Mechanical Engineering
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