A Generalized Pressure Drop Correlation for Evaporation and Condensation of Alternative Refrigerants in Smooth and Micro-Fin Tubes
A Generalized Pressure Drop Correlation for Evaporation and Condensation of Alternative Refrigerants in Smooth and Micro-Fin Tubes
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DOI：
10.6028/nist.ir.6333
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发表时间：
2018-03
期刊：
影响因子：
7.3
通讯作者：
Jun-young Choi;M. Kedzierski;P. Domanski
中科院分区：
文献类型：
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作者：
Jun-young Choi;M. Kedzierski;P. Domanski
本文提出了光滑管和微翅片管中蒸发和冷凝的压降关系。该相关性是根据由以下纯制冷剂和混合制冷剂组成的数据库得出的：R125、R134a、R32、R410A（R32/R125 50/50 % 质量）、R22、R407C（R32/R125/R134a，23/25/52 % 质量）和 R32/R134a（25/75 % 质量）。新的相关性是通过分别用从微翅片管的压降数据和水力直径导出的摩擦因数替换 Bo Pierre 相关性中的摩擦因数和管直径而获得的。新的相关性预测了测量的微翅片数据，平均残差为 10.8%，并且还预测了光滑管中的压降，平均残差为 15.0%。此外，通过使用粘度混合规则，该相关性还用于预测制冷剂/润滑剂混合物的压降数据。因此，新的相关性预测了各种润滑剂与 R12、R22 和 R134a 的混合物的蒸发和冷凝压降测量数据，平均残留值为 19.0%。关键词：替代制冷剂、相关性、摩擦系数、传热、水力直径、微翅片管、压降、光滑管、两相流 1 文中提到或插图中标明了某些商品名称和公司产品，以便充分说明所用的实验程序和设备。在任何情况下，此类标识并不意味着美国国家标准技术研究所的推荐或认可，也不意味着该产品一定是最适合该用途的产品。
This paper presents a pressure drop correlation for evaporation and condensation in smooth and micro-fin tubes. The correlation was developed from a database consisting of the following pure and mixed refrigerants: R125, R134a, R32, R410A (R32/R125 50/50 % mass), R22, R407C (R32/R125/R134a, 23/25/52 % mass) and R32/R134a (25/75 % mass). The new correlation was obtained by replacing the friction factor and the tube-diameter in the Bo Pierre correlation with a friction factor derived from pressure drop data for a micro-fin tube and the hydraulic diameter, respectively. The new correlation predicted the measured micro-fin data with an average residual of 10.8 %, and it also predicted the pressure drop in smooth tube with an average residual of 15.0 %. In addition, the correlation was used to predict pressure drop data for refrigerant/lubricant mixtures by using a viscosity-mixing rule. As a result, the new correlation predicted the measured evaporation and condensation pressure drop data for mixtures of various lubricants with R12, R22, and R134a with an average residual of 19.0 %. Keyword: alternative refrigerants, correlation, friction factor, heat transfer, hydraulic diameter, micro-fin tube, pressure drop, smooth tube, two-phase flow 1 Certain trade names and company products are mentioned in the text or identified in an illustration in order to adequately specify the experimental procedure and equipment used. In no case does such an identification imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the products are necessarily the best available for the purpose.