制冷剂气体水合物分解热的确定

Determination of Dissociation Heat of Refrigerant Gas Hydrate

利用可视化高压流体测试装置 ,测定了HFC13 4a、HCFC141b和HFC15 2a水合物的分解条件 .根据测定的制冷剂气体水合物形成条件和压缩因子 ,计算了制冷剂气体水合物在 0℃以上的分解热 ,并进行了分析比较 .结果表明 :水合物分解热与形成水合物的结构有关 ;在一定温度范围内 ,两者的水合物分解热随温度的变化不大 ;HFC13 4a和HCFC141b水合物填充晶格的分子直径大小相当 ,两者的水合物分解热相近 ;计算和实验结果符合良好 .

Hydrate dissociation conditions of HFC134a, HCFC141b and HFC152a are measured using high pressure PVT equipment. According to the measured refrigerant gas hydrate dissociation conditions and compressibility factor, the dissociation heat of refrigerant gas hydrates at temperature above 0 ℃ is calculated and comparisons are made. The results show that hydrate dissociation heat is related to the structure of hydrate, and the dissociation heat of hydrate is basically independent of the temperature in a definite temperature range. The diameter of a guest molecule in the crystalline lattice of HFC134a hydrate is almost equal to that in the crystaline lattice of HCFC141b hydrate, so the dissociation heat of HFC134a hydrate is close to that of HCFC141b hydrate. The calculated results well coincide with the experimental ones. This method can be applied to engineering designs and calculations for cool storage system.