The combined effects of longitudinal heat conduction, flow nonuniformity and temperature nonuniformity in crossflow plate-fin heat exchangers

Ranganayakulu, C.; Seetharamu, K. N.

doi:10.1016/s0735-1933(99)00053-6

Cited by 57 publications

(27 citation statements)

References 6 publications

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“…Averous et al (1999) presented a dynamic simulation for a brazed plate heat exchanger. Ranganayakulau et al [12] analyzed the cross flow compact PFHE, accounting the combined effects of 2D heat conduction in the longitudinal direction through the wall of the exchanger, non-uniform flow of the inlet fluid and the temperature distribution using the finite element method. They observed that the declination of the thermal performance promotes the elimination of each other in the areas of higher NTU but promote each other in the areas of lower NTU, considering the heat conduction in the longitudinal direction, non-uniformity of the flow & the non-uniformity of the temperature.…”

Section: Development Of Experimental Analysis and Results In Platmentioning

confidence: 99%

Review of Experimental Analysis and Comparision of Results With Correlations Developed for Colburn Factor (J) and Friction Factor (F) in Plate Fin Heat Exchangers

2017

IJAERD

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Section: Development Of Experimental Analysis and Results In Platmentioning

confidence: 99%

Review of Experimental Analysis and Comparision of Results With Correlations Developed for Colburn Factor (J) and Friction Factor (F) in Plate Fin Heat Exchangers

2017

IJAERD

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“…Many researchers have pointed out that LHC degraded the heat transfer performance [6,9]. It is easily found that the heat transfer performance is greatly reduced by a strong LHC effect.…”

Section: Effect Of Small-scale Longitudinal Heat Conduction On Unbalamentioning

confidence: 99%

“…The experimental results were 20% lower than their CFD results [4] due to deviation in the boundary conditions and LHC in the test core solid wall along the flow direction. In earlier studies [5][6][7], LHC, flow non-uniformity and temperature non-uniformity effects on the heat transfer characteristics of plate-fin heat exchangers were studied. They found that LHC in the wall had significant effects in cross-flow and counter-flow heat exchangers and the effect of LHC was negligible for the parallel-flow heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of Small-Scale Longitudinal Heat Conduction in Plate Heat Exchangers

Borjigin

Zeng

et al. 2018

Energies

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Abstract:Longitudinal heat conduction has a significant effect on the heat transfer performance of plate heat exchangers, but longitudinal heat conduction is usually neglected in numerical studies and the thermal design of a heat exchanger. In this paper, heat transfer models with and without longitudinal heat conduction are proposed to analyze the effect of small-scale longitudinal heat conduction in a plate heat exchanger. The performance of small-scale longitudinal heat conduction is illustrated by temperature and heat flux contours in the heat transfer models with and without longitudinal heat conduction. The results show that small-scale longitudinal heat conduction occurs in the plate and a more uniform temperature profile of the plate is obtained due to small-scale longitudinal heat conduction. In balanced flow, the contributions of longitudinal heat conduction for counter-flow, cross-flow and parallel-flow plate heat exchangers are −3.15%, −0.09% and 0, respectively, whereas, for the respective unbalanced flows they are evaluated to be −1.73%, 0.53% and 0.05%, respectively. Moreover, it is observed that small-scale longitudinal heat conduction in plates is influenced by the thermal conductivity of the plate. The higher the thermal conductivity, the larger is the reduction of thermal performance. The contribution of longitudinal heat conduction varies from −0.54% to −4.01%.

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“…Additionally, they found that the performance deteriorations were severe in some typical applications due to fluid flow nonuniformity. In addition, Ranganayakulu and Seetharamu [19] evaluated heat exchanger performance with the combined effects of wall longitudinal heat conduction (LHC), temperature nonuniformity (TN) and flow nonuniformity (FN) on crossflow heat exchangers with a balanced flow as well as with an unbalanced flow [19]. They found that the thermal performance variations of a crossflow compact heat exchanger due to the combined effects of LHC, TN and FN are not always negligible and the deterioration of thermal performance tend to eliminate each other in the regions of higher NTU.…”

Section: Analysis Of the Refrigerant Maldistribution Problemmentioning

confidence: 99%

A Review of Refrigerant Maldistribution

Tang¹,

Chng²,

Chin³

2014

Int. J. Automot. Mech. Eng.

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In recent years, conservation of energy has become a challenging issue in air-conditioning applications. In order to overcome this issue, many researchers have recommended the use of a Parallel Flow Condenser and a low Global Warming Potential and Ozone Depletion Potential refrigerant, such as R32, in air conditioning systems. However, PFC faces the critical challenge of flow maldistribution in the tubes. This literature review mainly examines the refrigerant maldistribution problem which has been investigated by previous researchers. It was found that many of the researchers did not properly analyse the influence of flow maldistribution profiles on the performance degradation of heat exchangers. In order to have a comprehensive analysis of tube-side maldistribution in Parallel Flow microchannel heat exchangers, it is recommended that the influence of the higher statistical moments of the probability density function of the flow maldistribution profiles on performance degradation be quantified. Additionally, R32 maldistribution should be analysed and compared with R410A, which is the current commonly used refrigerant in air conditioning units. Moreover, in order to have a realistic simulation of the effect of refrigerant flow maldistribution profiles on performance degradation of heat exchangers, the effect of superheat and sub-cooling must be analysed.

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The combined effects of longitudinal heat conduction, flow nonuniformity and temperature nonuniformity in crossflow plate-fin heat exchangers

Cited by 57 publications

References 6 publications

Review of Experimental Analysis and Comparision of Results With Correlations Developed for Colburn Factor (J) and Friction Factor (F) in Plate Fin Heat Exchangers

Review of Experimental Analysis and Comparision of Results With Correlations Developed for Colburn Factor (J) and Friction Factor (F) in Plate Fin Heat Exchangers

A Numerical Study of Small-Scale Longitudinal Heat Conduction in Plate Heat Exchangers

A Review of Refrigerant Maldistribution

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