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Transient Response of Liquid Systems Cooled by Mechanical Refrigeration 机械制冷冷却液体系统的瞬态响应
计算冷却搅拌和非搅拌批次所需时间所涉及的分析技术为化学加工行业所熟知。Bowman等人、Fisher、Chaddock和Sanders在加热和冷却时间方面进行了早期研究。Antonetti等人最近的一篇论文将E-NTU方法应用于批量冷却问题。然而,涉及直接膨胀设备的冷却时间的计算通常采用基于“下拉”期间平均条件的近似值,而不考虑被冷却批次的混合程度。本文研究了不同制冷剂吸入温度对搅拌和非搅拌两种极端情况下冷却时间的影响。引文:伊利诺伊州芝加哥ASHRAE Transactions第79卷第1部分
The analytical techniques involved in the calculation of the time required to cool agitated and unagitated batches are well known to the chemical process industry. Early work in the field of heating and cooling times was done by Bowman, et al, Fisher, and Chaddock and Sanders. A recent paper by Antonetti, et al. applied the E-NTU method to batch cooling problems. The calculation of cooling times involving direct expansion equipment, however, is often performed by resorting to approximations based on average conditions during the "pull-down" period and without consideration to the degree of mixing of the batch being cooled. This paper examines the influence of a varying refrigerant suction temperature on the cooling times of two extreme cases of agitated and unagitated batches.
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