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首页> 外文期刊>International Journal of Refrigeration >Study of capillary tubes in a transcritical CO{sub}2 refrigeration system
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Study of capillary tubes in a transcritical CO{sub}2 refrigeration system

机译：跨临界CO {SUB} 2制冷系统中毛细管的研究

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Capillary tubes have been used in refrigeration systems for many years, but not with a transcritical CO{sub}2 system. In this article, the effects of capillary tubes in a transcritical CO{sub}2 refrigeration system have been investigated experimentally and theoretically. Different types of capillary tubes with different lengths (0.5-4 m) and diameters (1-2 mm) have been tested. The result of this work is a static model, which is used in the further work to make a simulation model (static) of a complete refrigeration system. The model is based on Friedel's and Colebrook's pressure drop correlations. The behaviour of an adiabatic capillary tube in a refrigeration cycle has been investigated theoretically. The conclusion is that the COP of a system with capillary tubes generally is better than when a fixed high pressure is used, but not as good as when variable optimal high pressure is used. Capillary tubes are especially interesting in applications where the evaporation pressure is constant and the temperature out of the gas cooler varies no more than + 10 K from the design condition. The reduction in COP is more significant at low temperatures out of the gas cooler.
机译：毛细管在制冷系统中使用多年，但不是跨临界CO {Sub} 2系统。在本文中，已经通过实验和理论地研究了跨临界CO {Sub} 2制冷系统中的毛细管在跨临界CO {} 2制冷系统中的影响。已经测试了不同类型（0.5-4米）和直径（1-2毫米）的不同类型的毛细管。这项工作的结果是静态模型，用于进一步的工作中制作完整制冷系统的仿真模型（静态）。该模型基于Friedel和Colebrook的压力下降相关性。在理论上已经研究了防冻循环中的绝热毛细管的行为。结论是，具有毛细管的系统的COP通常优于使用固定的高压，但不像使用可变最佳高压时一样好。毛细管在蒸发压力恒定的应用中特别有趣，并且气体冷却器的温度从设计条件变化不超过+ 10k。在气体冷却器的低温下，COP的减少更为显着。

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