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Flue-gas condenser is used for cleaning the flue-gases in the energy sector. In Latvia, fuel consumption in the household sector is high, so it is planned to introduce this technology in this sector. In the research process of flue-gas condenser, the focus is on reactor testing, rather than on the work of the sedimentation tank – part of the system intended for purification of water from captured particulate matter. In order to ensure good sedimentation process efficiency, it is necessary to know which parameters the process depends on. This study mainly describes the parameters affecting the sedimentation process – dependent indicators and the methods for determining them. The main conclusion is that both methods can be used during the research.

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With the increase of renewable energy sources, the control methods of the energy systems are an increasingly important topic. Control methods have evolved from simple on/off controllers to methods that utilize artificial intelligence and can have a predictive nature. This paper investigates the control methods that are particular for solar thermal systems. A bibliometric method is applied to analyse scientific literature related to the specific application from the Web of Science database. Results show that recent developments in control methods focus on solar thermal to power and hybrid systems while district heating is a potential research gap. Annual publication trends, country, journal and keyword analysis is presented.