1. Department of Mechanical Engineering, Aalto University, Espoo, Finland
2. Smart City Center of Excellence, TalTech, Tallinn, Estonia
3. Department of Environmental Engineering, Hamburg University of Applied Sciences, Hamburg, Germany
4. Competence Center for Renewable Energy and Energy Efficiency (CC4E), Hamburg, Germany
5. College of Urban Construction, Nanjing Tech University, Nanjing, China
6. Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, Norway