Thermodynamic analysis of a combined power/refrigeration cycle: Combination of Kalina cycle and ejector refrigeration cycle
Thermodynamic analysis of a combined power/refrigeration cycle: Combination of Kalina cycle and ejector refrigeration cycle
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DOI：
10.1016/j.enconman.2017.12.047
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发表时间：
2018-02
影响因子：
10.4
通讯作者：
Candeniz Seçki̇n
中科院分区：
文献类型：
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作者：
Candeniz Seçki̇n
本文研究了一种新的动力和制冷循环，它是卡琳娜循环和喷射制冷循环（ERC）的组合。在所提出的组合循环的配置中，喷射器制冷循环被插入到Kalina循环中以从贫氨溶液回收热量，贫氨溶液以高温/高压离开分离器并且在Kalina循环中不有助于发电。Kalina循环和ERC的工作流体分别是氨水溶液和R134 a。利用EES软件对联合循环进行了模拟，详细介绍了所采用的数学模型和开发的模拟程序。联合循环五个关键运行参数的影响（即涡轮机入口压力、涡轮机入口温度、氨水基液浓度、冷凝器出口温度和换热器内制冷剂压力）对联合循环性能参数的影响（制冷量、发电量、热效率、发电的火用，分析了制冷的火用和火用效率），并报道了测定结果背后的物理机制。此外，性能参数随换热器压力的变化与不同的制冷剂（R134 a，R152 a和R290）进行了检查，以确定制冷剂对系统性能的影响。结果表明，联合循环热效率随涡轮机入口温度和氨水溶液浓度的升高而升高，随冷凝器出口温度和换热器压力的升高而降低。在分析的涡轮机进口压力范围内确定了一个最大热效率点。（火用）效率随涡轮机入口压力、涡轮机入口温度和氨水溶液浓度的升高而增大，随冷凝器出口温度和换热器压力的升高而减小。ERC运行时，R290的制冷量和热效率最高，R134 a的制冷量和热效率最低。R290的ERC运行效率最低，R134 a的ERC运行效率最高。
In the present study, a new power and refrigeration cycle is investigated which is a combination of a Kalina cycle and an ejector refrigeration cycle (ERC). In the proposed configuration of the combined cycle, an ejector refrigeration cycle is inserted into the Kalina cycle to recover heat from ammonia poor solution which leaves the separator at high temperature/pressure and does not contribute to power generation in Kalina cycle Working fluid of the Kalina cycle and ERC are ammonia-water solution and R134a, respectively. The combined cycle is simulated by EES software and details of the applied mathematical model and developed simulation program are extensively reported. The effect of five key operational parameters of the combined cycle (i.e. turbine inlet pressure, turbine inlet temperature, concentration of ammonia-water basic solution, condenser outlet temperature and pressure of refrigerant in heat exchanger) on the combined cycle performance parameters (refrigeration capacity, power production, thermal efficiency, exergy of produced power, exergy of refrigeration and exergy efficiency) is analyzed and physical mechanisms behind the determined results are reported. Additionally, variation of performance parameters with heat exchanger pressure is examined with different refrigerants (R134a, R152a and R290) to determine the effect of refrigerants on system performance. The results show that thermal efficiency of the combined cycle increases with increasing turbine inlet temperature and concentration of ammonia-water solution but decreases with rising condenser outlet temperature and heat exchanger pressure. A maximum thermal efficiency point is determined in the analyzed range of the turbine inlet pressure. Exergy efficiency increases with rising turbine inlet pressure, turbine inlet temperature and concentration of ammonia-water solution but decreases with increasing condenser outlet temperature and heat exchanger pressure. Refrigeration capacity and thermal efficiency results of the combined cycle are the highest for the operation of ERC with R290 and the lowest with R134a. Exergy efficiency is the lowest for ERC operation with R290 and the highest with R134a.