Effect of air-side flow maldistribution on thermal–hydraulic performance of the multi-louvered fin and tube heat exchanger

Mao, Jingqin; Chen, H.X.; Jia, Haikun; Wang, Y.Z.; Hu, Haitao

doi:10.1016/j.ijthermalsci.2013.06.001

Cited by 58 publications

(16 citation statements)

References 29 publications

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“…It was recommended that mean, standard deviation, and skew should be optimized in the effort of improving the thermal performance of the heat exchanger. Mao et al [4] found that air flow maldistribution affects the deterioration of condensation capacity and refrigerant pressure drop which are 6% and 34%, respectively. However, they did not analyse the impact of refrigerant flow maldistribution.…”

Section: Introductionmentioning

confidence: 99%

Analysis on the refrigerant (R32) flow maldistribution of microchannel heat exchanger under superheat and sub-cool

Chng¹,

Chin²,

Tang³

2017

Int. J. Automot. Mech. Eng.

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The aim of this research is to study the impact of statistical moments of probability density function such as mean, standard deviation, skew of R32 flow maldistribution profile on the thermal performance of microchannel heat exchanger under superheat, and subcooling effect. A mathematical model was developed in order to analyse the influence of the statistical moments of probability density function of R32 flow maldistribution on the thermal performance of microchannel heat exchanger under superheat and sub-cooling effect. It was found that the high standard deviation and high negative skew of R32 flow maldistribution profile gave a large impact on the D of microchannel heat exchanger and can achieve up to 10%. Moreover, it was found that the heat transfer performance of microchannel heat exchanger dropped significantly when the sub-cool increases. In short, low standard deviation, high positive skew, and superheat of a flow maldistribution profile is preferred in order to minimize the performance deterioration effect. An experiment was set up to verify the mathematical model. The results from the mathematical model agreed well within 10% of the experimental data. A performance deterioration correlation related to refrigerant maldistribution under superheat and subcool was developed to provide a faster solution to design an even flow distribution heat exchanger. The proposed correlation in this research offers a quicker and simpler way to study the R32 flow maldistribution problem.

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Section: Introductionmentioning

confidence: 99%

Analysis on the refrigerant (R32) flow maldistribution of microchannel heat exchanger under superheat and sub-cool

Chng¹,

Chin²,

Tang³

2017

Int. J. Automot. Mech. Eng.

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“…Heinzelmann et al investigated the closing models of heat exchanger inlet slots and introduced that closing the upper inlet slot causes a *Address correspondence to this author at the Vehicle Engineering Institute, Hunan University of Technology, No.88, Taishan West Road, Zhu-Zhou, Hunan, 412007, China; Tel: +8615292200781; E-mail: zhangyong7051678@163.com more significant increase in the downstream fluid temperature than closing the lower inlet slot [6]. Saab et al analyzed the impact of the underhood opening area on the cooling air speed [7] and Mao et al compared the heat exchanger performance of different air velocity distributions [8].…”

Section: Introductionmentioning

confidence: 99%

Vehicle Radiators’ Performance Calculation and Improvement Based on the Coupling of Multi-scale Models Simulations

Liu¹,

Li²,

Zhang³

2014

TOMEJ

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Abstract:In simulation of the heat transfer between radiator and air flow field, the adoption of the radiator full-size model containing its core body structure with small feature sizes would require huge storage space and not be economical. In view of this question, based on the coupling of multi-scale models simulations, a calculation method of radiator performance is proposed in this paper the reliability of which is verified by an experiment test. Subsequently, the influence on the radiators' thermal performance of the layout of the parts in front of the radiators is analyzed. Lastly, the layout of the front parts is modified to enhance the radiators' thermal performance. The investigation results indicate that: the radiators' thermal performance calculation method based on simulations coupling of radiator multi-scale models considers the influences of air-side flow field distribution and the core body structure details; the error of the calculating values from the method is less than 5%, and the method is reliable; when the heat source parts in front of the radiators are situated right in front of the rear fan channel, the radiators thermal performance is better; the radiators cooling power increases 19.3kW after layout modification of the front heat resource parts.

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“…Simulating four different theoretical airflow patterns (uniform, parabolic, saddle and linear), Mao et al (2013) found out a maximum thermal capacity reduction was only of about 5%. Furthermore, they also noticed a strict relationship between the value of the refrigerant mass flow rate and the performance degradation due to the air maldistribution.…”

Section: Airflow Maldistribution: Experimental and Numerical Studiesmentioning

confidence: 98%

“…In this context, different models have been developed for the simulation of the Round-tube and MCHX condensers over the years. A detailed literature review led to identify the models proposed by Lee and Domanski (1997) Fronk and Garimella (2011); (Padilla, 2012); (Martínez-Ballester et al (2013) and Mao et al (2013). Even though these models and software are based on different approaches, such as the application of the energy conservation equations to every control volume or the utilization of the traditional -NTU method, they can be globally classified as semi-empirical models.…”

Section: Heat Transfer Coefficients and Pressure Dropmentioning

confidence: 99%

“…In regard to the effect of air maldistribution on condenser performance, Mao et al (2013) published a new mathematical model for the estimation of the performance of a multi louver plate tube condenser. The model was based on the integration of the energy balance equations by mean of the FVM (Finite Volume Method) and it was validated adopting a wide range of experimental data.…”

Section: Airflow Maldistribution: Experimental and Numerical Studiesmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of the condensation process and air maldistribution in finned tube and minichannel condensers

Pisano¹

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Effect of air-side flow maldistribution on thermal–hydraulic performance of the multi-louvered fin and tube heat exchanger

Cited by 58 publications

References 29 publications

Analysis on the refrigerant (R32) flow maldistribution of microchannel heat exchanger under superheat and sub-cool

Analysis on the refrigerant (R32) flow maldistribution of microchannel heat exchanger under superheat and sub-cool

Vehicle Radiators’ Performance Calculation and Improvement Based on the Coupling of Multi-scale Models Simulations

Analysis of the condensation process and air maldistribution in finned tube and minichannel condensers

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