A Modified Correlative Model for Condensation Heat Transfer in Horizontal Enhanced Tubes with R32 and R410A Refrigerants

Gangan Zhang, Dehui Du, Le Zhang, Yanlong Xiang, Wei Li, Jiapei Zhang, Jincai Du () and David J. Kukulka ()
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Gangan Zhang: College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
Dehui Du: College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
Le Zhang: College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
Yanlong Xiang: Ningbo Jintian Copper Tube Co., Ltd., Ningbo 315000, China
Wei Li: College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
Jiapei Zhang: Department of Energy Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
Jincai Du: Department of Energy Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
David J. Kukulka: Department of Engineering Technology 1300 Elmwood Avenue, State University of New York College at Buffalo, Buffalo, NY 14222, USA

Energies, 2023, vol. 16, issue 13, 1-15

Abstract: An experimental study was performed that compared tube side condensation heat transfer characteristics of enhanced tubes (hydrophobic surface tubes (HYD), herringbone micro fin tube (HB), and a composite hydrophobic/herringbone (micro fin) tube (HYD/HB)) to the performance of a smooth tube (ST). The condensation heat transfer coefficient (HTC) was calculated from data that were recorded for smooth and enhanced tubes that had an outer diameter (OD) of 12.7 mm. Data were collected (as a function of mass flow rate) using a couple of refrigerants (R410A and R32), for saturated temperatures of 35 °C and 45 °C, with vapor qualities that ranged from 0.8 to 0.2. Several previously reported smooth tube HTC models were used to calculate values that could be compared to experimentally obtained HTC values. The correlation model that demonstrated the best accuracy (for the conditions considered) was then modified for use with the enhanced tubes from this study. Results from the modified correlation show differences with experimental values that ranged from −10% to +17%; the new modified correlation demonstrates high prediction accuracy. An accurate correlation allows the evaluation of enhanced heat transfer tubes for use in high-efficiency heat exchanger systems. The development of this new model is significant in the study of enhanced heat transfer.

Keywords: enhanced tubes; condensation heat transfer; modified correlation model (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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