以［Li（TX-7）］SCN/H2O为工质对的第二类热泵特性研究

通过静态法测量了[Li（TX-7）]SCN/H₂O溶液在283.15~443.15 K温度条件下的饱和蒸气压，通过差式扫描量热法测量了离子液体[Li（TX-7）]SCN在温度T=73.15~423.15 K条件下的比热容，并建立了经验关联式，通过Wilson模型对[Li（TX-7）]SCN/H₂O溶液组分活度系数的关联预测了其过量焓，并通过预测值计算了二元溶液的比焓，建立了[Li（TX-7）]SCN/H₂O的热力学模型。基于实验数据与热力学模型对以[Li（TX-7）]SCN/H₂O为工质对的第二类热泵的理论循环特性进行了仿真分析，研究了各部件不同工作温度对系统性能参数的影响，并与其他吸收式系统的性能参数进行了比对。[Li（TX-7）]SCN/H₂O系统的性能优于LiBr/H₂O系统，适用于发生温度和蒸发温度较低的工况。

Study on the characteristics of the second type heat pump with [Li(TX-7)]SCN/H2O as the working fluid pair

The saturated vapor pressure of the [Li(TX-7)]SCN/H₂O solution at 283.15—443.15 K was measured by the static method, and the specific heat capacity of the ionic liquid [Li(TX-7)]SCN under the condition of temperature T=73.15—423.15 K was measured by the differential scanning method, and an empirical correlation formula is established. The excess enthalpy of the [Li(TX-7)]SCN/H₂O solution component activity coefficient was predicted by the Wilson model, and the specific enthalpy of the binary solution was calculated by the predicted value, and the thermodynamic model of [Li(TX-7)]SCN/H₂O was established. Based on the experimental data and thermodynamic model, the theoretical cycle characteristics of the second type heat pump with [Li(TX-7)]SCN/H₂O as the working fluid pair are simulated and analyzed, the influence of different operating temperatures of various components on the performance parameters of the system is studied and compared with the performance parameters of other absorption systems. The performance of the [Li(TX-7)]SCN/H₂O system is better than that of the LiBr/H₂O system, and it is suitable for working conditions with lower generation and evaporation temperatures.