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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...

Avoiding thermal bridges in the building envelope is one of the key elements for the reduction of energy consumption in buildings. Numerical calculations of heat flux through the joints of building structures are becoming very relevant in the past years due to the EU requirements for nearly zero energy buildings. The most problematic typically is windows installation perimeter, where thanks to fastenings of the frame to the loadbearing structure, linear thermal bridge forms. The use of numerical calculation of tem...