基于卡琳娜循环的功冷联供系统热力学分析

THERMODYNAMIC ANALYSIS FOR COMBINED COOLING AND POWER SYSTEM BASED ON KALINA CYCLE

在传统卡琳娜动力循环基础上,可以增加一个喷射制冷过程进一步利用工质的余压余热能,从而提出一种基于卡琳娜循环的新型功冷联供系统。运用数值求解方程式EES(engineering equation solver)编程计算,分析蒸发压力、和冷凝温度的改变对系统中引射系数及复合系统性能的影响,从热效率、?效率和折合效率3个评价指标对复合系统性能进行综合评价。通过数据分析得出:随着蒸发压力升高,蒸发器吸热量逐渐减小,存在一个最佳的蒸发压力使净输出功达到最大,约为2.6 MPa,但其和引射系数与制冷量及各评价指标成正相关关系;冷凝温度与系统蒸发器吸热量、净输出功、制冷量、引射系数和各评价指标均成负相关关系。结果表明在较高的蒸发压力和较低的冷凝温度下,各评价指标较优。

The novel combined cooling and power （CCP） system with adding a spray cooling process to utilize further residual pressure and waster heat of working fluids based on traditional Kalina cycle. Engineering Equation Solver （EES） was used to program and calculate, analyze the effect of the change of evaporating pressure and condensing temperature on ejection coefficient and performance of combined cooling and power （CCP） system. The comprehensive evaluation of CCP system performance was performed according to three evaluation indexes, including thermal efficiency, exergy efficiency and conversion efficiency. The data analyses show that as evaporating pressure increases, the heat absorption of evaporator decreases gradually and there is an optimal evaporating pressure to maximize net output power which is about 2.6MPa. It has positive correlation with ejection coefficient, cooling capacity and every evaluation index. The condensation temperature has inverse correlation relationship with heat absorption quantity of system evaporator, net output power, cooling capacity, ejection coefficient and every evaluation index. The results show that each evaluation index is superior when the system has a higher evaporating pressure and a lower condensation temperature.