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首页> 外文期刊>International Journal of Refrigeration >Optimisation of the throttling system in a CO{sub}2 refrigerating machine
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Optimisation of the throttling system in a CO{sub}2 refrigerating machine

机译：CO {sub} 2制冷机中的节流系统的优化

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This paper is an answer to the need of finding the optimal solution for the throttling system in refrigerating machines using CO{sub}2 as working fluid; such a solution must combine reliability, low installation cost and high energy efficiency. To this purpose, different expansion systems are compared by means of a simulation programme, including a new one, operating with a differential valve, a liquid receiver and a thermostatic valve. The typical compression refrigerating cycle performed by CO{sub}2 involves transcritical operations and therefore the upper pressure needs to be adjusted to the optimal value, that, unlike the traditional cycle, is not determined by heat transfer. The innovative system here proposed shows an intrinsic self-adjusting capability that leads to COP values quite close to the maximum ones when a fixed suitable value of the differential pressure is chosen, even if the temperature of the secondary fluid varies to a large extent.
机译：本文是针对在使用CO {sub} 2作为工作流体的制冷机中为节流系统寻找最佳解决方案的需求的答案。这种解决方案必须兼具可靠性，低安装成本和高能效。为此，通过模拟程序对不同的膨胀系统进行了比较，包括一个新的程序，该程序与差动阀，液体接收器和恒温阀一起运行。由CO 2进行的典型压缩制冷循环涉及跨临界操作，因此需要将上部压力调节至最佳值，这与传统循环不同，不是由传热确定的。这里提出的创新系统显示出一种内在的自我调节能力，即使选择二次流体的温度变化很大，当选择固定的压差合适值时，COP值也将非常接近最大值。

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