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分析了跨临界CO_2引射制冷循环的运行稳定性问题,对蒸气反馈和两级蒸发两种致引射系统稳定的调控方案构建了热力学模型。模拟研究表明蒸气反馈调控系统具有与基本引射循环调控引射系数致系统稳定非常相似的制冷效果。而两级蒸发调控可明显提高系统的制冷性能。引射系数越小,蒸气反馈调控的可调工况区间越窄,两级蒸发方案的可调工况区间越宽。对于蒸气反馈调控,同时考虑COP优化和具较宽的可调工况,引射系数在0.6～0.7间较合适。
The operating stability of the transcritical CO2 injection refrigeration cycle was analyzed. The thermodynamic model was established for the stable control scheme of two kinds of catalysis systems with vapor feedback and two-stage evaporation. Simulation studies show that the steam feedback control system has the same cooling effect as the system stability of the basic ejector circulation control ejector coefficient. The two-stage evaporation control can significantly improve the system’s cooling performance. The smaller the emissivity, the narrower the adjustable range of vapor feedback control, and the wider the adjustable range of two-stage evaporation scheme. For the steam feedback control, taking into account the COP optimization and a wide range of adjustable conditions, the injection coefficient of 0.6 to 0.7 is more appropriate.