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Title: EXPERIMENTAL PERFORMANCE OF SOLAR THERMAL COLLECTOR SYSTEMS IN REAL OPERATION CONDITIONS IN LATVIA
EXPERIMENTAL PERFORMANCE OF SOLAR THERMAL COLLECTOR SYSTEMS IN REAL OPERATION CONDITIONS IN LATVIA

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Stanislavs Gendelis; Mikus Mikelsons
10.5593/sgem2022/4.1/s17.11
10.5593/sgem2022/4.1
1314-2704
978-619-7603-44-6
English
22
4.1
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Renewable Energy Sources and Clean Technologies
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 collectors depending on the building’s roof, tilt angle and the mounting combination (one or two rows). Each system is equipped with hot water accumulator tanks with a total volume of 3000 l to ensure hot water supply during peak demands (typically in the mornings).
Analysis of the recorded data from the systems shows the actual energy produced with the help of solar thermal collector systems in real operation conditions. Calculations determine the actual energy production, which is estimated in the range of 320–380 kWh/m2 annually, or 395–470 kWh/kW per installed power output depending on the system’s spatial orientation. The most efficient is a south-east-oriented collector at a 25° tilt angle, reaching 50% efficiency (from available energy) during the summer days. The difference from the planned 500 kWh/m2 is explained due to higher cloudiness and the fact that the system is not even activated on cold days.
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This work was supported by the postdoctoral project “Analysis of the actual energy consumption of zero energy buildings and the development of the necessary energy efficiency improvement solutions” (1.1.1.2/VIAA/3/19/505).
conference
https://doi.org/10.5593/sgem2022/4.1/s17.11
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Proceedings of 22nd International Multidisciplinary Scientific GeoConference SGEM 2022
22nd International Multidisciplinary Scientific GeoConference SGEM 2022, 04 - 10 July, 2022
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference SGEM
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Turkish Acad Sci.
81-88
04 - 10 July, 2022
website
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solar thermal collector, solar energy production, renewable energy, real operation conditions, domestic hot water