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

Energy and cost analysis of processing flat plate solar collectors

Mamdouh El Haj Assad, Ali Khosravi, Mohammad Alshabi, Bassam Khuwaileh, Abdul Kadir Hamid 2021 Energy Engineering: Journal of the Association of Energy Engineering

Evaluating consumer investments in distributed energy technologies

Giorgio Castagneto Gissey, Behnam Zakeri, Paul E. Dodds, Dina Subkhankulova 2021 Energy Policy

Bioenergy development in the UK & Nordic countries

Sam Cross, Andrew J. Welfle, Patricia Thornley, Sanna Syri, Mikael Mikaelsson 2021 Biomass and Bioenergy

Stochastic Multicriteria Acceptability Analysis of EV Sharing in Nordic Rural Areas Affected by Seasonal Residence and Counterurbanization

Johannes Einolander, Annamari Kiviaho 2021 Proceedings of the 54th Hawaii International Conference on System Sciences | 2021

Energy storage

Mamdouh El Haj Assad, Ali Khosravi, Mohammad Malekan, Mohammad Malekan, Marc A. Rosen, Amin Puia 2021 Design and performance optimization of renewable energy systems

Geothermal power plants

Mamdouh El Haj Assad, Ali Khosravi, Amin Puia, Marc A. Rosen 2021 Design and Performance Optimization of Renewable Energy Systems

Indoor temperature conditions and energy demand of a Finnish detached house in a changing climate

Azin Velashjerdi Farahani, Juha Jokisalo, Natalia Korhonen, Risto Kosonen 2021 E3S Web of Conferences

Emissions and power demand in optimal energy retrofit scenarios of the Finnish building stock by 2050

Janne Hirvonen, Juhani Heljo, Juha Jokisalo, Antti Kurvinen, Arto Saari, Tuomo Niemelä, Paula Sankelo, Risto Kosonen 2021 Sustainable Cities and Society

Seasonal storage of residential exhaust air and sewage waste heat

Janne Hirvonen, Juha Jokisalo, Risto Kosonen 2021 E3S Web of Conferences

Analyzing energy flexibility by demand response in a Finnish district heated apartment building

Yuchen Ju, Juha Jokisalo, Risto Kosonen, Ville Kauppi, Philipp Janßen 2021 E3S Web of Conferences
More information on our research in the Research database.
Research database

Research group members

Sami Lestinen

Tutkijatohtori
T212 Mechanical Engineering

Yuchen Ju

Doctoral candidate
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