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District heating is an efficient way to provide heat to residential, tertiary  and industrial users. The heat storage unit is an insulated water tank that  absorbs surplus heat from the boiler. The stored heat in the heat storage  unit makes it possible to heat even when the boiler is not working, thus  increasing the heating efficiency. In order to save primary energy (fuel),  the boiler operates on nominal load every time it is in operation (for the  purpose of this research). The aim of this paper is to analyze the water  temperature variation in the heat storage, depending on the heat load and the  heat storage volume. Heat load is calculated for three reference days, with  average daily temperatures from -5 to 5°C. The primary energy savings are  also calculated for those days in the case of using heat storage in district  heating.[Projekat Ministarstva nauke Republike Srbije, br. TR 33051: The  concept of sustainable energy supply of settlements with energy efficient  buildings

Primary energy savings using heat storage for biomass heating systems