Jörgen Wallin
Researcher
Details
Researcher
About me
I am an Associate Professor (Docent) in Energy Technology at the Division of Applied Thermodynamics and Refrigeration. The main focus of my research is efficient energy use in the built environment. I develop technical solutions that reduce energy use and climate impact without compromising comfort, hygiene or safety – from domestic hot water systems in individual buildings to the city's sewer tunnels. My research combines measurements, simulation and systems analysis, in close collaboration with property owners, water utilities, energy companies and public authorities.
Research projects
Since 2008 I have worked in ten research projects funded by the Swedish Energy Agency, Formas, EU Horizon 2020 and the Käppala Association, among others – four of them as principal investigator.
Principal investigator
| Project | Funder | Period | Role |
|---|---|---|---|
| TERRA – Thermal resilience and robustness in sewer systems Sewer tunnels as a thermal resource for security of supply, with the Käppala tunnel as case study. KTH is coordinator. | Swedish Energy Agency (Termo) | 2026– ongoing | Principal investigator, project leader |
| System model for heat extraction upstream of the Käppala treatment plant Wastewater temperature measurements across the entire tunnel system and modelling of how heat extraction affects the treatment plant. | Käppala Association | 2023–2024 | Principal scientific investigator (energy) |
| Legionella growth in hot water circulation systems How temperature and flow affect Legionella growth in hot water circulation – and how large the energy savings can be. In collaboration with Chalmers. | Swedish Energy Agency | 2023–2024 | Principal investigator, project leader |
| Development of sustainable energy-efficient water supply systems in society Water recycling and heat recovery at building and district level. In collaboration with Chalmers. | Swedish Energy Agency | 2021–2024 | Principal investigator, project leader |
Participating researcher
| Project | Funder | Period | Role |
|---|---|---|---|
| EBTT – ElBussTransTherm Thermal comfort and energy use in electric buses. | Swedish Energy Agency | ongoing | Deputy project leader |
| Heat-pump-boosted wastewater heat recovery in KTH Rocks Evaluation of wastewater heat recovery with a heat pump in 302 apartments, KTH Live-In Lab. | Einar Mattsson AB | 2023–2024 | Responsible for energy analysis |
| SEQWENS – Sustainable and equitable access to water and energy Actor-driven disruptive system change in water and energy systems. | Formas | 2018–2022 | Work package leader, WP1 |
| Energy recovery from wastewater flows Energy recovery from wastewater in buildings. In collaboration with Chalmers. | HSB Living Lab | 2020 | Co-applicant |
| GrowSmarter Smart city solutions in Stockholm, Barcelona and Cologne. | EU Horizon 2020 | 2016–2020 | Expert, evaluation of energy measures |
| Heat pumps in the existing building stock Identifying suitable energy efficiency measures using heat pumps – my doctoral project. | Swedish Energy Agency (EFFSYS 2) | 2008–2014 | Doctoral researcher |
Teaching and supervision
I am course responsible for Achieving Energy Efficiency in Existing Buildings (MJ2462) and supervise students at master's and doctoral level. I am passionate about combining technical expertise with practical applications and contributing to a sustainable transformation of the building sector and energy systems.