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Updated normative documents within the Fit for 55 legislative package envisage increased dynamics in achieving European Green Deal goals, which are obligatory for EU countries. This directly applies to over 65 million energy-inefficient buildings in EU27 urban areas as well as heat supply systems. However, unified funding for long-term renovation programs is not planned. To respond quickly to diverse financing options with distinct conditions and target variables, a costly and time-consuming elaboration of detaile...

The data from three solar thermal collector systems installed in dormitories of the University of Latvia in Riga are analysed in detail to obtain parameters that characterise the operation of such systems in real operation conditions in Riga, Latvia. All the systems were installed in 2019-2020 and the data for one full year is available for the study. The area and the power output for the observed solar thermal collectors are similar-63 m2 with 51 kW for each. The differences exist only in the orientation of the c...

Three photovoltaic (PV) systems with the identical solar panels, the same charge controllers, and similar loads, but with different used battery types: AGM deep-cycle, LiFePO4 and lead-carbon were installed in Riga, Latvia for a long-term monitoring and analysis of the operation efficiency and potential energy losses in batteries under real operation conditions. Results of one full year of monitoring are analysed in this paper resulting quantitative indicators during different seasons. During the wintertime with l...