Heat transformation based on CaCl2/H2O – Part B: Open operation principle

Abstract

In order to increase the efficiency of industrial processes by means of thermal energy storage and upgrade of waste heat in a temperature range of 100 °C -200 °C thermochemical systems are a promising option. The working pair CaCl 2 /H 2 O has been identified as suitable reference system due to the possibility to store thermal energy and perform an upgrade of thermal energy at the same time. As working principle an open mode ̇ volume flow (m 3 h -1 )x water vapor concentration (-)

Chemical Heat Storage Using an SiC Honeycomb Packed with CaCl<sub>2</sub> Powder

“…The equilibrium lines of the 0.3, 1, and 2 hydration states during the heat release step are shown in Table 2. The reaction lines for the hydration and dehydration were reported [11] [12] [13]. During the heat discharging process, hydration of the anhydrous CaCl 2 occurs.…”

Identification of best available thermal energy storage compounds for low-to-moderate temperature storage applications in buildings

“…In open absorption cycles the desiccants are regenerated against the ambient water vapour pressure (dew point of the ambient air) whereas the reference temperature is well above the ambient wet bulb temperature, thus open cycle regeneration requires lower regeneration temperatures and therefore higher collector efficiency (39). An open system based on CaCl 2 /H 2 O was tested by Bouché et al (152), which, according to test results, could allow a thermal upgrade of approximately 65 K.…”

Heat storage: Hydration investigation of MgSO4/active carbon composites, from material development to domestic applications scenarios

“…Unfortunately, heat and mass transfer issues are frequently observed in these materials. Their poor thermal conductivity and the formation of crusts upon hydration often enable the water molecules diffusion into the solid [65,66].…”