【摘要】 超临界二氧化碳动力循环优势明显,但所用物性参数目前主要依赖于实验数据,调用过程复杂,缺乏定量表达式快速计算。应用BWR方程,结合实际气体热力普遍关系及等价转换关系,采取了以理想状态为中间过程的积分路径,推导了温度300～600 K、压力7～30 MPa范围的CO₂热力性质解析模型,能够快速计算压缩因子、内能、焓、熵、比热容。编程计算大量数据点,并在近临界区加密取样,绘图与REFPROP数据进行了对比分析。模拟结果表明,解析模型计算平均误差均较小,对高温超临界区普遍适用。更多还原

【Abstract】 Although supercritical carbon dioxide power cycle exhibits appent advantages,but the property parameters mainly depend on experimental data whose calling process is complex,and the quantitative expressions for fast calculation are insufficient. Based on BWR equation of state and in combination with real gas thermodynamic relation and equivalent conversion relation,the analytical model of CO₂ thermodynamic properties are derived along the integral path with ideal state as the intermediate process under the condition of temperature ranging 300-600 K and pressure being between 7-30 MPa,which can quickly calculate compressibility factor,internal energy,enthalpy,entropy and specific heat capacity. A large number of data are obtained by programming,encrypted near critical region,and then compared with the data of REFPROP by drawing curves. The analysis shows that the average error of the analytical model is small,and it is generally applicable to the high temperature supercritical region.更多还原