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二氧化碳作为环境友好型的自然冷媒已经成功的应用于商业制冷领域,在多种复杂的场合发挥着重要的作用,其应用系统型式多样,主要包括:复叠系统,载冷系统和跨临界系统。其中跨临界制冷系统以CO_2作单一制冷剂,该系统的应用在降低制冷系统对环境的不利影响方面具有独特的优势,其能效表现的好坏直接影响了它的发展和推广应用。对目前CO_2跨临界制冷系统在环境温度较高的温热气候条件下运行效率偏低的问题的几种解决方案进行了综述性的分析。
As an environment-friendly natural refrigerant, carbon dioxide has been successfully used in the field of commercial refrigeration. It plays an important role in many complicated occasions. Its application system is diverse and includes: cascade system, refrigeration system and transcritical system. Among them, the transcritical refrigeration system uses CO_2 as a single refrigerant. The application of this system has unique advantages in reducing the negative impact of the refrigeration system on the environment. The performance of its energy efficiency has a direct impact on its development and application. Several solutions to the current problem of low operating efficiency of CO 2 transcritical refrigeration system in warm climatic conditions with high ambient temperature are summarized.