N2 - The article presents a numerical model of the concrete heat accumulator for solar heating systems. Model uses control volume finite element method with an explicit solution method for time integration. The use of an explicit method is an essential advantage in the simulation of time-dependent changes in temperature of the air at the accumulator inlet. The study compares the results of numerical model calculations of the accumulator heating with experimental measurements and with computational fluid dynamics modeling. The comparison shows a good correlation between the results of calculation using the model and the results of measurements. L1 - http://www.journals.pan.pl/Content/94662/mainfile.pdf L2 - http://www.journals.pan.pl/Content/94662 PY - 2014 IS - No 3 September EP - 295 KW - heat storage KW - solar heating system KW - control volume finite element method A1 - Sacharczuk, J. A1 - Taler, D. PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences DA - 2014 T1 - A concrete heat accumulator for use in solar heating systems Ů a mathematical model and experimental verification SP - 281 UR - http://www.journals.pan.pl/dlibra/publication/edition/94662 T2 - Archives of Thermodynamics