Characterization of potassium carbonate salt hydrate for thermochemical energy storage in buildings

Abstract

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Systematic Analysis of Materials for Coated Adsorbers for Application in Adsorption Heat Pumps or Refrigeration Systems

“…This salt is labelled as dangerous (Category 1) because it causes serious eye damage/irritation. Potassium carbonate (K 2 CO 3 ) is a highly promising and deeply investigated adsorbent in the field of thermal energy storage [41,42]. It loses 1.5 molecules of water at 104 • C with a vapor pressure of 20 mbar and an enthalpy around 65.8 kJ/mol of water.…”

Performance analysis of a K2CO3-based thermochemical energy storage system using a honeycomb structured heat exchanger

“…where p and p eq are the partial and equilibrium pressures of the gas product respectively (here the water vapor). The value of equilibrium vapor pressure p eq [Pa] is given by [22]:…”

“…The study helps designing and optimizing high temperature thermo-chemical energy storage modules for power generation applications. One of the most promising chemical reaction systems for energy storage is the reaction utilizing potassium carbonate and water vapor [22]:…”

“…Gaeini et al [22] summed up the advantages of a K 2 CO 3 − K 2 CO 3 ⋅ 1.5H 2 O system with a storage capacity up to 96.015 kJ/mol (reaction enthalpy of ΔH r = 64.01 kJ/mol of water) corresponding to a maximum energy density of 1.30 GJ/m 3 [23,24]. It features high material energy density and the reaction shows good reversibility.…”

“…Table 1 The thermophysical properties of TCM and operating parameters considered in the present study [22,41]. simulations and a parametric study for the hydration of the TCM bed are analyzed.…”