An Experimental Study of In-Tube Condensation and Evaporation Using Enhanced Heat Transfer (EHT) Tubes

Boren Zheng, Jiacheng Wang, Yu Guo, David John Kukulka, Weiyu Tang, Rick Smith, Zhichuan Sun and Wei Li
Additional contact information
Boren Zheng: Department of Energy Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310027, China
Jiacheng Wang: Department of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, 99 Songling Road, Qingdao 266061, China
Yu Guo: Department of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, 99 Songling Road, Qingdao 266061, China
David John Kukulka: Department of Mechanical Engineering Technology, State University of New York College at Buffalo, 1300 Elmwood Avenue, Buffalo, NY 14222, USA
Weiyu Tang: Department of Energy Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310027, China
Rick Smith: Rigidized Metals Corporation, Vipertex Division, 658 Ohio Street, Buffalo, NY 14203, USA
Zhichuan Sun: AVIC Nanjing Engineering Institute of Aircraft Systems, Nanjing 211106, China
Wei Li: Department of Energy Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310027, China

Energies, 2021, vol. 14, issue 4, 1-15

Abstract: A study was carried out to determine in-tube evaporation and condensation performance of enhanced heat transfer tubes (EHT) using R410A, with the results being compared to a plain tube. The test tubes considered in the evaluation include: plain, herringbone (HB) and spiral (HX) microgrooves, herringbone dimple (HB/D), and hydrophobic herringbone (HB/HY). Experiments to evaluate the condensation were conducted at a saturation of 318 K, and at 279 K for evaporation. Mass flux (G) ranged between 40 to 230 kg m −2 s −1 . Condensed vapor mass decreased from 0.8 to 0.2; and the mass of vaporized vapor increases from 0.2 to 0.8; heat flux increased with G. Inlet and outlet two-phase flow patterns at 200 kg m −2 s −1 were recorded and analyzed. Enhanced tube heat transfer condensation performance (compared to a plain tube) increased in the range from 40% to 73%. The largest heat transfer increase is produced by the herringbone–dimple tube (HB/D). In addition to providing drainage, the herringbone groove also helps to lift the accumulated condensate to wet the surrounding wall. Evaporation thermal performance of the enhanced tubes are from 4% to 46% larger than that of smooth tube with the best performance being in the hydrophobic herringbone tube (HB/HY). This enhancement can be attributed to an increase in the number of nucleation sites and a larger heat transfer surface area. Evaporation and condensation correlations for heat transfer in smooth tubes is discussed and compared.

Keywords: enhanced heat transfer; enhanced heat transfer surface; condensation heat transfer; evaporation heat transfer; heat transfer flow patterns; correlations (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: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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