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Experimental investigation on performance of transcritical CO_2 heat pump system with ejector under optimum high-side pressure

机译：在最佳高压下带喷射器的跨临界CO_2热泵系统性能的实验研究

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摘要

Since the fixed ejector cannot adjust the optimum high-side pressure, the adjustable ejector is designed and built based on a transcritical CO_2 heat pump system model results. The adjustable ejector is subjected to electrical pulses through the stepper motor which drives needle forward or backward movement to change the nozzle throat area for the optimum high-side pressure. Experimental investigation of the transcritical CO_2 heat pump cycle with adjustable ejector is presented. The effects of the high-side pressure on the system performance are analyzed. A control strategy for maximum COP_h, is developed by correlating the CO_2 pressure and temperature at the gas cooler exit, yielding the ejector optimum high-side pressure control equation. Experiment results show that there exist maximum values for heating performance coefficient and heat capacity with increasing high-side pressure. The increased high-side pressure has a positive effect on the system performance and outweighs lower ejector efficiencies. The ejector efficiency is mainly distributed within range of 20%-30%.
机译：由于固定式喷射器无法调节最佳高压侧压力，因此基于跨临界CO_2热泵系统模型结果设计和制造了可调节式喷射器。可调式喷射器通过步进电机受到电脉冲的驱动，步进电机驱动针头向前或向后移动，以改变喷嘴的喉部面积，以获得最佳的高压侧压力。提出了具有可调喷射器的跨临界CO_2热泵循环的实验研究。分析了高端压力对系统性能的影响。通过关联气体冷却器出口处的CO_2压力和温度，开发出最大COP_h的控制策略，从而得出喷射器的最佳高压侧控制方程。实验结果表明，随着高压侧压力的增加，加热性能系数和热容量存在最大值。升高的高压压力会对系统性能产生积极影响，并超过较低的喷射器效率。喷射器效率主要分布在20％-30％的范围内。

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  • 来源
    《Energy》 |2012年第1期|p.870-877|共8页
  • 作者

    Xiao Xiao Xu; Guang Ming Chen; Li Ming Tang; Zhi Jiang Zhu;

  • 作者单位

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, No. 174 Shazhengjie, Shapingba, Chongqing 400044, PR China,Institute of Refrigeration and Cryogenics, National Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou 310027, PR China;

    Institute of Refrigeration and Cryogenics, National Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou 310027, PR China;

    Institute of Refrigeration and Cryogenics, National Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou 310027, PR China;

    Institute of Refrigeration and Cryogenics, National Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou 310027, PR China;

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  • 正文语种 eng
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  • 关键词

    optimum high-side pressure; CO_2; transcritical cycle; ejector; heat pump; experiment;

    机译：最佳高端压力;CO_2;跨临界循环顶出器热泵;实验;

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