Sirvi Autor "Kokin, Eugen (advisor)" järgi
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Kirje Solar and wind energy seasonal heat storage systems for residential buildings in Nordic climate(Eesti Maaülikool, 2020) Kalder, Janar; Annuk, Andres (advisor); Kokin, Eugen (advisor); Galinš, Ainars (opponent)In this doctoral thesis are handled possibilities, how to increase renewable energy on-site usage, which is produced from wind and sun. In the Nordic climate, the main share of energy consumption in buildings is the need for heating, being ~ 80% in Estonia. To increase the share of renewable energy for heating buildings, the energy storage systems are needed, because this renewable energy is fluctuating. The doctoral thesis is based on a four scientific publications, the first of which examines the behaviour of a system without storing devices, changing the ratio of wind and solar energy production, if the heat pump is used for heating. In this case, if ratio of wind and solar energy is 70% and 30%, the annual coverage of electricity supply can be up to 37.5%. The second publication presents the results of using the hot water boilers as energy storage in different wind conditions. In a good wind conditions, the share of renewable energy can be 68%. In the third and fourth publications, the results of using the vacuum insulated tank in the house heating system are presented. In this tank, the heat energy can be stored for a long time. Producing the heat energy with the solar collectors in summertime and storing it in the vacuum insulated tank, allows cover 41% of the heat energy demand from the renewable sources. Integrating the vacuum insulated tank in to the renewable energy system, where the electricity is produced from sun and wind, the annual share of renewable energy is 79%. In this case, the additional heating devices are not needed, because amount of the electricity from the grid is comparable small.