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通过热分析方法 ,对 KAl(SO4) 2 · 1 2 H2 O作为一种低温化学贮热材料进行了研究 ,吸热反应在 60 -1 5 0℃温度范围时的平均反应焓为 449k J· mol-1,放热反应在 60 -2 5℃温度范围的平均反应焓为 3 41 .7k J· mol-1;在正逆反应循环 1 0次的基础上 ,能量利用率达 76.1 %。
The thermal analysis of KAl (SO4) 2 · 1 2 H 2 O as a low-temperature chemical heat storage material was studied. The average enthalpy of reaction for endothermal reaction in the temperature range of 60 -150 ℃ was 449 kJ · mol -1, and the average reaction enthalpy of the exothermic reaction was 417.7 kJ · mol-1 in the temperature range of 60-2 5 ℃. On the basis of 10 cycles of forward and reverse reaction, the energy utilization rate reached 76.1%.