Determining state of charge of a thermal energy storage device based on phase change material

Abstract

The present disclosure relates to determining a state of charge of a phase change material based thermal energy storage device. A method for determining a state of charge, SOC, of a phase change material based thermal energy storage device, PCM-TES, having a storage module comprising a phase change material for storing thermal energy, the PCM-TES comprising a sensor for measuring at least one surface temperature at the storage module of the PCM-TES as a first temperature; determining an operating condition of the PCM-TES; and if the operating condition is determined to be an active condition in which a heat transfer fluid is flowing through an outlet of the PCM-TES: measuring a liquid temperature at the outlet of the PCM-TES as a second temperature; calculating at least one first SOC value, SOC 表面 , using a first selected function of the first temperature; calculating a second SOC value, SOC 出口 , using a second selected function of the second temperature; determining the SOC, SOC 总 , of the PCM-TES using a third selected function of the calculated at least one first SOC value, SOC 表面 , and the calculated second SOC value, SOC 出口 , so as to determine the SOC of the PCM-TES in a simple and reliable manner.

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