The paper gives brief calculation and analysis for the artificial well efficiency, which aims at the optimization design for pumping unit and for reference.
文章仅对抽油机井系统效率进行简单分析与计算，旨在为优化设计抽油机运行参数提供参考。
The control scheme of maximum COP value of electrical refrigerator is presented, making the refrigeration system operation in the well efficiency.
针对制冷过程的特点，提出了电冰箱控制系统的最大能效比控制方法，使制冷系统工作在最佳状态。
The control scheme of maximum COP value of electrical refrigerator is presented, making the refrigeration system operation in the well efficiency.
针对制冷过程的特点，提出了电冰箱控制系统的最大能效比控制方法，使制冷系统工作在最佳状态。
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