• Nikolaos Taousanidis Department of Mechanical Engineering, University of Western Macedonia
  • Konstantinos Gavros Department of Electrical and Computer Engineering, University of Western Macedonia
  • Andreas Taousanidis Sykes International
Keywords: Solar thermal, solar cooling, solar district heating


Solar thermal energy is a straightforward application of renewable energy. The unique advantage of solar heating and cooling technologies is that they are compatible with nearly all sources of back-up heat and almost universally applicable due to their ability to deliver hot water, hot air and cold air. It is estimated that solar energy technologies can provide more than 50% of low temperature heating and cooling demand for buildings in 2050 and contribute a significant share to the heat supply for the agricultural and industrial sectors. Thus, solar heating and cooling will contribute significantly to lowering CO2 emissions worldwide and reaching the Paris Agreement goal. If the direct use of solar energy for heating purposes via solar collectors, as shown in the sustained energy scenarios, is to make a significant contribution to the energy supply, it is necessary that solar-heating technologies be developed and widely applied over and beyond the field of domestic-hot-water preparation only. In order to stimulate investment, governments must take the lead role in creating a favourable investment climate for widespread use of solar heating and cooling. Measures and directions are proposed in current review.


1. Zhiyong Tian, et al, “Large-scale solar district heating plants in Danish smart thermal grid: Developments and recent trends”, Energy Conversion and Management 189 (2019), pp. 67–80
2. Seyed Ali Sakhaei, Mohammad Sadegh Valipour, “Performance enhancement analysis of the flat plate collectors: A comprehensive review”, Renewable and Sustainable Energy Reviews 102 (2019) pp.186–204
3. Luca Evangelisti et al, “Latest advances on solar thermal collectors: A comprehensive review”, Renewable and Sustainable Energy Reviews 114 (2019) 109318
4. UNEP Guidelines for policy and framework conditions, 2015
5. EurObserv’ER, The State of Renewable Energies in Europe, Edition 2018
6. Werner Weiss, Monika Spörk-Dür, “Solar Heat Worldwide-Global Market Development and Trends in 2018”, IEA Solar Heating & Cooling Programme, May 2019
7. IEA, “Technology Roadmap - Solar Heating and Cooling”, July 2012
8. IEA, “IEA SHC TCP Strategic Work Plan 2019 – 2024”, August 9, 2018
9. IEA, “IEA Solar Heating and Cooling Technology Collaboration Programme - 2018 Annual report”, March 2019
10. EU, “Directive (EU) 2018/2001 of the European Parliament and of the Council of 11 December 2018 on the promotion of the use of energy from renewable sources”, PE/48/2018/REV/1, OJ L 328, 21.12.2018, p. 82–2
11. REN21, “Renewables 2019 Global Status Report”, May 2019
How to Cite
Taousanidis, N., Gavros, K., & Taousanidis, A. (2020). SOLAR THERMAL SYSTEMS: CURRENT SITUATION AND AMBITIOUS GOALS. Nonconventional Technologies Review, 24(1). Retrieved from