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Study of carbon dioxide condensation in chevron plate exchangers; heat transfer analysis

机译：人字形板式换热器中二氧化碳冷凝的研究；传热分析

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The experimental investigation of carbon dioxide condensation in brazed plate heat exchangers is the main objective of this study. The current level of concern for the environment is at an all time high, therefore, it is important to look into methods and resources that lead to a cleaner and healthier future for the planet. This study details one such effort to reach this goal, focusing on condensation of carbon dioxide as a natural refrigerant in refrigeration systems. Three brazed plate heat exchangers with different geometry, each consisting of three channels, are tested. This paper focuses on the two-phase analysis, where carbon dioxide was the working fluid, flowing through the middle channel, and dynalene brine, the cooling fluid, flowed through the side channels of each geometry. Condensation of carbon dioxide occurred at saturation temperatures ranging from -17.8 ℃ to -34.4 ℃ and heat fluxes spanning 2.5-15.7 kW/m~2. An in-depth dimensional analysis was completed on the two-phase data yielding heat transfer correlations. Relationships of the two-phase heat transfer characteristics are presented, the data are compared with related studies, and conclusions are made from the two-phase data.
机译：钎焊板式换热器中二氧化碳冷凝的实验研究是本研究的主要目的。当前对环境的关注空前高涨，因此，重要的是研究能够为地球带来更清洁，更健康的未来的方法和资源。这项研究详细介绍了实现这一目标的一项努力，重点是冷凝二氧化碳作为制冷系统中的天然制冷剂。测试了三个具有不同几何形状的钎焊板式换热器，每个换热器由三个通道组成。本文着重于两相分析，其中二氧化碳是工作流体，流经中间通道，而二萘胺盐水（冷却液）流经每种几何形状的侧通道。二氧化碳的冷凝发生在-17.8℃至-34.4℃的饱和温度和2.5-15.7 kW / m〜2的热通量范围内。对两相数据进行了深入的尺寸分析，得出了热传递相关性。给出了两相传热特性的关系，并将数据与相关研究进行了比较，并从两相数据得出了结论。

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