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CO_2-EXPANDER/COMPRESSOR FOR SUB-CRITICAL AND TRANS-CRITICAL OPERATION

机译:亚临界和跨临界操作的CO_2膨胀机/压缩机

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摘要

The primary objectives to use a combined expander/compressor unit in a CO_2 refrigeration cycle are to improve the COP and to reduce the exhaust pressure of the main compressor of the system.With the successful development of such an expander/compressor by the TU Dresden,the primary objectives have been reached.In summer as well as in warmer regions of the world the ambient temperature is higher then the critical temperature of the CO_2.That means that the refrigeration system operates in a trans-critical mode.For this operation conditions the expander was originally developed.But in Central and Northern Europe and many other regions of the world,the ambient temperature is during long periods of the year and during the night so low,that the condensing pressure of the CO_2 refrigeration system can be kept below 70 bar,i.e.that the cycle can be operated in a sub-critical mode.This requirement implicates for the expander quite different working conditions and this has to be investigated.
机译:在CO_2制冷循环中使用组合式膨胀机/压缩机组的主要目的是提高COP并降低系统主压缩机的排气压力。随着德累斯顿TU成功开发出这种膨胀机/压缩机,达到了主要目标。在夏季以及世界上较温暖的地区,环境温度高于CO_2的临界温度,这意味着制冷系统以跨临界模式运行。膨胀机最初是开发出来的。但是在中欧和北欧以及世界上许多其他地区,环境温度在一年中的较长时间和夜间都很低,以至于CO_2制冷系统的冷凝压力可以保持在70以下bar,即该循环可以在亚临界模式下运行。此要求意味着膨胀机的工作条件完全不同,必须对此进行研究。

著录项

  • 来源
    《Compressors 2006》|2006年|p.1-7|共7页
  • 会议地点 Casta Papiernicka(SK);Casta Papiernicka(SK)
  • 作者单位

    Institute for Refrigeration and Cryogenics,Technische,Universitaet Dresden,josef@memkn.mw.tu-dresden.de;

    Institute for Refrigeration and Cryogenics,Technische,Universitaet Dresden,Hans.Quack@tu-dresden.de;

    Institute for Refrigeration and Cryogenics,Technische Universitaet,Dresden,joerg@memkn.mw.tu-dresden.de;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 压缩机;
  • 关键词

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