The master's thesis deals with the optimization of the size of the sensible heat storage tank for district heating systems using the simulation tool TRNSYS. As part of the task, we set up a simulation model in the TRNSYS tool, which was later validated with the help of experimental data. With the help of a validated simulation model, we carried out several simulations of the thermal response and the efficiency of heat storage tanks of different sizes in the district heating system in Lenart. The obtained simulation results for different sizes of heat storage tanks were evaluated and compared with each other using various indicators. With the help of indicators, we determined the optimal size of the heat storage tank for the mentioned system in Lenart and showed what happens if an oversized heat storage tank is installed in the system.
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