Investigation of the efficiency of a high temperature heat storage charging

Wroclaw University of Technology, Faculty of Mechanical and Power Engineering, Poland

^a Corresponding author: artur.nems@pwr.edu.pl

Abstract

The article presents the results of the test of a heat storage filled with chamotte brick. The air parameters were used as the basis for determining the heat stream represented by a working medium, which was then compared with the stream accumulated in the material filling the deposit. Additionally, heat streams were shown for individual segments of the deposit. The efficiency of heat accumulation was determined for each of them. They showed that the efficiency of accumulation process was highest in the deposit’s first segments and the lowest in the last segments, where the air was the coldest. The dynamics of the efficiency’s shift was different for each of the observed segments. In the area closest to the inlet of hot air, the dynamics of the process of heat accumulation decreased the fastest and after one hour only a slight increase of efficiency was visible in the function of time. In the accumulation material placed closest to the outlet, the process of absorbing heat was very fast, starting from the 20th minute before the tests were completed. The smallest changes in the process’ character, throughout the whole time of testing, were recorded in the middle layer.