Evaluation of the efficiency of heat storage by a solid-state electric thermal storage

Abstract

Calculated and experimental studies of thermal processes and the efficiency of heat storage of solid thermal storage materials in an electric thermal storage (ETS) were carried out. Changes in the thermo physical properties of selected thermal storage materials depending on temperature are analyzed. The specific heat storage capacity in the temperature range from 50 °C to 650 °C of such materials as magnesite, chamotte, dinas, corundum was estimated. The research was carried out on an electric thermal storage with an electric power of 2.4 kW with heat storage elements made of magnesite. The temperature distribution is obtained in the heat storage element, as well as in the wall of the air channels of the heat storage elements. Measurements of the temperature of the heated air in the channels of heat storage elements and at the exit from the ETS were carried out. Temperature measurements were carried out with chromel-alumel thermocouples in a ceramic shell and chromel-kopel in a heat-resistant fabric cover. As a result of experimental studies, the temperature distribution in the heat storage elements of ETS is obtained. Based on these data it was calculated the amount of stored heat by heat storage elements of ETS for the complete cycle of its operation.

Theoretical studies of the thermal state of heat storage elements of the electric thermal storage in the modes of charging and heat output

“…In [8], the study of the efficiency of heat storage by electric heat storages was carried out. In [9...11], studies of the efficiency of heat output by ETS are carried out.…”