Abstract
A composite ceramic-salt packed bed configuration is being developed for high-temperature thermal storage. The range of application is industrial waste heat recovery and utilization, off peak utilization reserve and solar thermal power systems application. The thermophysical properties of the hybrid system SiO 2 /Na 2SO 4 have been investigated in the range from room temperature to temperatures above the melting point of the salt, 884°C. The Na 2SO 4 fraction in the composite materials was variied between 20 % and 50 %. The following properties were measured: xxx the specific enthalpy xxx the coefficient of thermal expansion xxx the thermal diffusivity. The measurement of the thermal expansion was performed with a commercial difference dilatometer; the specific enthalpy was measured by drop calorimetry and the thermal diffusivity with a laser flash device. The measured values are correlated to the base properties of the different SiO 2 crystalline modifications. Special attention has been paid to phase change behaviour.
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