Heat-transfer enhancement in fin-and-tube heat exchanger with improved fin design

Wen, Mao-Yu; Ho, Ching-Yen

doi:10.1016/j.applthermaleng.2008.05.019

Cited by 91 publications

(27 citation statements)

References 19 publications

(20 reference statements)

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“…A number of studies have reported improvements in heat transfer by a heat exchanger via the use of nanofluids obtained by suspending X 2 O 3 type oxides such as Al 2 O 3 , TiO 2 and SiO 2 in water [6,7]. Different experimental and theoretical studies have been performed to analyze and verify the advantages of nanofluids in various heat exchange systems including shell and tube heat exchangers [8], double tube heat exchangers [9,10] and plate heat exchangers [10]. Additionally, there have been a few engineering applications employing nanofluids such as flat panel solar thermal collectors and automobile radiators [11e13].…”

Section: Introductionmentioning

confidence: 98%

Heat transfer enhancement using alumina and fly ash nanofluids in parallel and cross-flow concentric tube heat exchangers

Sözen

Variyenli

Özdemir

et al. 2016

Journal of the Energy Institute

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Section: Introductionmentioning

confidence: 98%

Heat transfer enhancement using alumina and fly ash nanofluids in parallel and cross-flow concentric tube heat exchangers

Sözen

Variyenli

Özdemir

et al. 2016

Journal of the Energy Institute

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“…Chokeman and Wongwises [5] examined three herringbone wavy fin-and-tube heat exchangers and conducted experiments to investigate the effect of fin pattern and edge corrugation on air-side heat transfer and friction characteristics. Wen and Ho [6] tested three fin-and-tube heat exchangers, including a plate fin, wavy fin, and compound fin, in a range of airflows corresponding to Reynolds numbers of 600-1200, and Wen and Ho's results strongly suggest the use of compounded fins in the construction of heat exchangers. Pirompugd et al [7] tested 15 plain fin-and-tube heat exchangers and 18 wavy fin-and-tube heat exchangers, and found that the percentage of the surface that gets wet increases with increasing fin spacing or an increasing number of tube rows along with a decreasing Reynolds number.…”

Section: Introductionmentioning

confidence: 91%

Experimental Study on the Air-Side Performance of a Multipass Parallel and Counter Cross-Flow L-Footed Spiral Fin-and-Tube Heat Exchanger

Pongsoi

Pikulkajorn²

2012

Heat Transfer Engineering

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This study conducted experiments on the air-side performance of novel L-footed spiral fin-and-tube heat exchangers that were faced with airflow at high Reynolds numbers 000). The examined heat exchangers have a multipass paralleland-counter cross-flow type of water flow arrangement. This flow arrangement is a combination of the parallel cross-flow and the counter cross-flow. This type of water flow arrangement may be the best fit for the reverse-flow system, because it can provide constant heat-exchange effectiveness for every flow reversal direction at the same airflow rate. Ambient air was used as a working fluid on the air side and hot water for the tube side. This way the effect of the number of tube rows on the heat transfer and friction characteristics of L-footed spiral fin-and-tube heat exchangers was clearly observed. The effect of the fin's outside diameter on the pressure drop was also studied. The results show that the number of tube rows has no significant effect on the air-side heat transfer or on friction characteristics at high Reynolds numbers. However, the fin's outside diameter shows a significant effect on the pressure drop. The pressure drop increases as the fin's outside diameter increases for the same number of tube rows.

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“…Yan and Sheen investigated the heat transfer and pressure drop characteristics of heat exchangers with a plate with wavy and louvered fin surfaces and found that at the same Reynolds number, the louvered fin geometry shows larger values of f and j factors, compared with the plate fin surfaces. Yu and Wen in their experiment strongly suggested the use of the compound fin configuration for a heat exchanger. Pelaez et al .…”

Section: Introductionmentioning

confidence: 99%

Experimental study on thermal performance of optimum PG brine as a radiator coolant

Sahoo

2017

Heat Trans. Asian Res.

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The present study deals with the experimental impact of an alternative heat transfer fluids for overall performance improvement for radiators. Water and water mixed with anti‐freezing agents such as ethylene glycol (EG) and propylene glycol (PG) are the traditional coolants for an automotive radiator. Comparison of experimental and numerical analysis of optimum brine solution, that is 25% of propylene glycol and water as coolant for the rectangular fin radiator, has been well discussed. A closed loop test rig was designed, and fabricated with a wind tunnel section to achieve uniform velocity at the test section of the rectangular radiator and was tested for performance. Experimental runs were conducted at varying operating temperatures which included the runs for water, and an optimum propylene glycol brine solutions at 70 °C and 80 °C with various flow rates. Results show the energy performance of an optimum brine solution was nearly similar to that of water at high temperatures. The Nusselt number, heat transfer coefficient, and heat transfer rate for an optimum propylene glycol brine is nearly the same as water at 80 °C with a maximum deviation of 15%, 5.7%, and 6.6%, respectively, for theoretical and experimental result comparisons. Air side and coolant side pressure drops had a maximum deviation of 3.66% and 6.6%, respectively. Air and coolant exit temperatures had a deviation of 5% and 3.5%, respectively, with an air frontal velocity of 4.6 m/s in a rectangular fin radiator for an optimum brine solution used as coolant for the automotive radiator. The optimum propylene glycol brine may be environmentally beneficial.

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Heat-transfer enhancement in fin-and-tube heat exchanger with improved fin design

Cited by 91 publications

References 19 publications

Heat transfer enhancement using alumina and fly ash nanofluids in parallel and cross-flow concentric tube heat exchangers

Heat transfer enhancement using alumina and fly ash nanofluids in parallel and cross-flow concentric tube heat exchangers

Experimental Study on the Air-Side Performance of a Multipass Parallel and Counter Cross-Flow L-Footed Spiral Fin-and-Tube Heat Exchanger

Experimental study on thermal performance of optimum PG brine as a radiator coolant

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