Francesco Reda has about 10-year experience in R&D of renewable energy production system for district and/or building applications. Currently Senior Scientist at VTT Ltd. He gained a Ph.D. in mechanical engineering and has a background in energy building research field with a deep expertise in heating and cooling systems, system energy performance assessment, NZEB and solar technologies. His research is centred on renewable energy system applications for enabling the transition towards net zero energy buildings and districts. He is currently active in several European and International cooperation projects.

• 1. Ground source heat pump.- 2. Solar thermal collectors.- 3. Solar assisted ground source heat pump.- 4. Performance assessment in different climates.- 5. Conclusion.

Francesco Reda has about 10-year experience in R&D of renewable energy production system for district and/or building applications. Currently Senior Scientist at VTT Ltd. He gained a Ph.D. in mechanical engineering and has a background in energy building research field with a deep expertise in heating and cooling systems, system energy performance assessment, NZEB and solar technologies. His research is centred on renewable energy system applications for enabling the transition towards net zero energy buildings and districts. He is currently active in several European and International cooperation projects.

• 1. Ground source heat pump.- 2. Solar thermal collectors.- 3. Solar assisted ground source heat pump.- 4. Performance assessment in different climates.- 5. Conclusion.

Francesco Reda has about 10-year experience in R&D of renewable energy production system for district and/or building applications. Currently Senior Scientist at VTT Ltd. He gained a Ph.D. in mechanical engineering and has a background in energy building research field with a deep expertise in heating and cooling systems, system energy performance assessment, NZEB and solar technologies. His research is centred on renewable energy system applications for enabling the transition towards net zero energy buildings and districts. He is currently active in several European and International cooperation projects.

• 1. Ground source heat pump.- 2. Solar thermal collectors.- 3. Solar assisted ground source heat pump.- 4. Performance assessment in different climates.- 5. Conclusion.