Energy density enhancement of chemical heat storage material for magnesium oxide/water chemical heat pump

Fourier-transform infrared and X-ray diffraction analyses of the hydration reaction of pure magnesium oxide and chemically modified magnesium oxide

“…Salt hydrates such as MgCl 2 $6H 2 O, 14,15 LiOH$H 2 O, 16 and metal sulfates 15,[17][18][19] have been used as CHS materials in the temperature range of 100-250 C. Mg(OH) 2 , [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] Ca(OH) 2 , 28,[35][36][37] and MgCO 3 (ref. 38) can be used to store energy in the temperature range of 200-500 C. These materials exhibit high energy density and the property of reversibility.…”

Prediction of the effective thermal conductivity of packed bed with micro-particles for thermochemical heat storage

“…(1) and (2). For example, when a Ca(OH) 2 particle with 10 lm diameter (volume is approximately 523 lm 3 ) is dehydrated, the diameter of the particle shrinks with the Ca(OH) 2 transformed into CaO. After the completed reaction, a CaO particle of diameter 7.9 lm (volume is approximately 262 lm 3 ) is obtained, calculated by Eq.…”

“…ETC of a packed bed depends on factors such as composition and porosity of the powder, operating temperature, gas pressure, and heat transfer-enhancing structure. On the one hand, the effective thermal conductivity can be experimentally measured by laser-flash and hot wire methods, which have been employed for some thermochemical materials [7][8][9][10][11]. On the other hand, theoretical or numerical analyses support the experimental results with various conditions and heat transfer feature.…”

Thermal conductivity-controlled Zn-doped MgO/Mg(OH)2 micro-structures for high-efficiency thermo-dynamic heat energy storage

“…The reactants are stable, and the temperature required for the thermochemical reaction, especially in MgO/Mg(OH) 2 systems, is only 300°C; it is therefore expected to be applicable in various fields. The most serious problem in applying MgO/Mg(OH) 2 systems in actual industrial or application fields is that the heat transfer efficiency of the reaction is not very high due to the low thermal conductivity of MgO and Mg(OH) 2 [17][18][19][20][21][22][23][24][25]. Because low thermal conductivity can reduce efficiency by disturbing the heat flow to the inside of the materials employed in MgO/Mg(OH) 2 systems.…”