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

How do cities promote urban sustainability and smartness? An evaluation of the city strategies of six largest Finnish cities

Hannele Ahvenniemi, Aapo Huovila 2021 Environment, Development and Sustainability

Parabolic trough solar collectors

Mohammad Malekan, Ali Khosravi, Mamdouh El Haj Assad 2021 Design and performance optimization of renewable energy systems

Performance analysis of the demand-based ventilation in a nordic apartment building

Ilia Kravchenko, Risto Kosonen, Simo Kilpeläinen 2021 Applied Sciences (Switzerland)

Performance analysis of the modern demand-based ventilation in Finnish apartment buildings

Ilia Kravchenko, Risto Kosonen, Simo Kilpeläinen 2021 Sisäilmastoseminaari 2021. Verkkoseminaari 9.3.2021

Effects of Night Ventilation on Indoor Air Quality in Educational Buildings—A Field Study

Sami Lestinen, Simo Kilpeläinen, Risto Kosonen, Maria Valkonen, Juha Jokisalo, Pertti Pasanen 2021 APPLIED SCIENCES

Hiilidioksidipitoisuuden paikallinen ja ajallinen vaihtelu koulun luokkatilassa

Sami Lestinen, Simo Kilpeläinen, Risto Kosonen, Juha Jokisalo 2021 Sisäilmastoseminaari 2021. Verkkoseminaari 9.3.2021

Impact of different mechanical ventilation strategies for night purging on indoor air quality in public buildings

Sami Lestinen, Simo Kilpeläinen, Risto Kosonen, Juha Jokisalo 2021 E3S Web of Conferences

Tilojen käytön ulkopuolisen ajan ilmanvaihdon vaikutus sisäilman laatuun koulu- ja päiväkotirakennuksissa

Sami Lestinen, Simo Kilpeläinen, Maria Valkonen, Risto Kosonen, Juha Jokisalo 2021 Sisäilmastoseminaari : verkkoseminaari 9.3.2021

An automated process to calibrate building energy model based on schedule tuning and signed directed graph method

Yan Lyu, Yiqun Pan, Tao Yang, Yuming Li, Zhizhong Huang, Risto Kosonen 2021 Journal of Building Engineering
More information on our research in the Research database.
Research database

Research group members

Sami Lestinen

T212 Mechanical Engineering

Yuchen Ju

Doctoral Candidate
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