The Riga Technical University Institute of Energy Systems and Environment, in cooperation with three Latvian companies, is implementing the project "Compact solar and pellet module" financed by the European Union. Within the framework of this project a combisystem will be installed in the Grandeg Ltd modular pellet boiler house. The solar combisystem will provide domestic hot water and space heating load for an apartment building in Sigulda. Due to the limited amount of space in the modular boiler house, optimal decisions should be made on the technical parameters of the system, including the volume of the heat storage tank and the surface area of solar collectors. Every alternative has both advantages and disadvantages. Economic factors of various alternatives are analyzed.
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