Abstract
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.
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