The optimal longitudinal location of curved winglets for better thermal performance of a finned-tube heat exchanger

Shi, WeiNa; Liu, Tengfei; Song, KeWei; Zhang, Qiang; Hu, Wanling; Wang, Liang-Bi

doi:10.1016/j.ijthermalsci.2021.107035

Cited by 35 publications

(5 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The flow resistance will also increase when the heat transfer is enhanced by adding baffles in the dry channel. In this study, the comprehensive performance evaluation index i [39] is used to indicate its worth. The resistance coefficient f shown in Equation ( 19) is used to evaluate the negative effects of baffles on PIEC resistance.…”

Section: Evaluation Indexmentioning

confidence: 99%

Numerical Analysis on Performance Improvement of a Vertical Plate Indirect Evaporative Cooler with Baffles

Zhou,

Cheng,

Wang

et al. 2024

Energies

View full text Add to dashboard Cite

The performance of the Plate Indirect Evaporative Cooler (PIEC) can be effectively improved by incorporating baffles in the dry channel. However, in the dimensional influence of the baffles on PIEC performance there remains a research gap. In order to investigate the impact of baffle dimensions on the wet bulb efficiency, namely the average heat transfer coefficient and the cooling capacity of the PIEC, this paper proposed and verified a three-dimensional numerical model and method based on the species transport model and the Euler wall film model. At the same time, in order to obtain the equilibrium point between the enhanced heat transfer performance and the additional resistance induced by baffles, a comprehensive performance evaluation index is introduced. The results indicate that, under the same conditions, (1) the baffle effect on PIEC performance is significant at a lower inlet air velocity, and the wet bulb efficiency of the PIEC with baffles can be improved by 22.8%; (2) the baffle effect on PIEC performance is negative if its relative length exceeds 60% or the primary air inlet velocity surpasses 4 m/s under the conditions specified in this paper; and (3) the baffle effect on PIEC performance is significant when its channel height is lower and its channel width is larger, and the wet bulb efficiency of the PIEC with baffles can be improved by 29.3%.

show abstract

Section: Evaluation Indexmentioning

confidence: 99%

Numerical Analysis on Performance Improvement of a Vertical Plate Indirect Evaporative Cooler with Baffles

Zhou,

Cheng,

Wang

et al. 2024

Energies

View full text Add to dashboard Cite

show abstract

“…Terefore, this model was also used for calculation in this example. Te second-order windward format and SIMPIEC algorithm were used for each equation [21]. Te boundary conditions were set as follows: the fuid was air with inlet velocity (velocity-inlet) set as 1-5 m/s, the inlet temperature was uniformly set as 293 K, the air outlet was set as free fow (outfow), the temperature of the inner surface of the base tube was set constant as 313 K without a slip wall (wall), the boundary between the air and material contact surface was set as the fuid-solid coupling boundary (coupled), and both sides of the fns and the upper and lower sides were symmetric boundaries [22].…”

Section: Mathematical Modelmentioning

confidence: 99%

Comprehensive Evaluation of the Performances of Heat Exchangers with Aluminum and Copper Finned Tubes

Wang,

Li,

Liu

et al. 2023

International Journal of Chemical Engineering

View full text Add to dashboard Cite

The finned-tube heat exchanger is the core part of an air conditioning system. Its heat exchange performance directly affects the energy consumption and efficiency of the air conditioner. The shortage and rising price of copper have led to increasing replacement of copper tubes with aluminum tubes in finned-tube heat exchangers. This paper studies two kinds of such heat exchangers, one consisting of copper tubes and aluminum fins and the other consisting of aluminum tubes and aluminum fins. The influences of the different base tube materials on heat transfer are compared and analyzed in terms of heat transfer strength and cost per unit heat transfer. The results show that the heat transfer and heat transfer coefficient increase with increasing inlet wind speed. Under different inlet wind speeds, the heat transfer and heat transfer coefficient of the finned-tube heat exchanger with aluminum tubes are 4%–12% and 7%%–9% lower than those of an identically structured heat exchanger with copper tubes, respectively. The aluminum-aluminum exchanger achieves 67% higher heat transfer than that of the copper-aluminum exchanger at only 8% of the cost. These results are significant for guiding the development and application of finned-tube heat exchangers.

show abstract

“…Plate-fin heat exchanger Numerical 2021 Shi et al [122] To better understand the influence of the winglet on the flow structure and heat transfer enhancement mechanism of the systems, streamlines of the flow are illustrated in Figure 3. Winglets generate a counter-spinning vortex appearing along the duct, whereas the flat plate indicates no vortex.…”

Section: Wingletsmentioning

confidence: 99%

A Review of Recent Passive Heat Transfer Enhancement Methods

et al. 2022

View full text Add to dashboard Cite

Improvements in miniaturization and boosting the thermal performance of energy conservation systems call for innovative techniques to enhance heat transfer. Heat transfer enhancement methods have attracted a great deal of attention in the industrial sector due to their ability to provide energy savings, encourage the proper use of energy sources, and increase the economic efficiency of thermal systems. These methods are categorized into active, passive, and compound techniques. This article reviews recent passive heat transfer enhancement techniques, since they are reliable, cost-effective, and they do not require any extra power to promote the energy conversion systems’ thermal efficiency when compared to the active methods. In the passive approaches, various components are applied to the heat transfer/working fluid flow path to improve the heat transfer rate. The passive heat transfer enhancement methods studied in this article include inserts (twisted tapes, conical strips, baffles, winglets), extended surfaces (fins), porous materials, coil/helical/spiral tubes, rough surfaces (corrugated/ribbed surfaces), and nanofluids (mono and hybrid nanofluids).

show abstract

The optimal longitudinal location of curved winglets for better thermal performance of a finned-tube heat exchanger

Cited by 35 publications

References 50 publications

Numerical Analysis on Performance Improvement of a Vertical Plate Indirect Evaporative Cooler with Baffles

Numerical Analysis on Performance Improvement of a Vertical Plate Indirect Evaporative Cooler with Baffles

Comprehensive Evaluation of the Performances of Heat Exchangers with Aluminum and Copper Finned Tubes

A Review of Recent Passive Heat Transfer Enhancement Methods

Contact Info

Product

Resources

About