Heat Transfer Enhancement and Pressure Drop of Grooved Annulus of Double Pipe Heat Exchanger

Sunu, Putu Wijaya; Rasta, I Made

doi:10.14311/ap.2017.57.0125

Cited by 10 publications

(2 citation statements)

References 27 publications

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“…The thermal performance of a double pipe heat exchanger can be improved by a heat transfer enhancement technique. The heat transfer mechanism in a heat exchanger can potentially be improved fundamentally by generating turbulence in the fluid flow, for example, by adding a corrugated tube [4,5], a twist tape [6,7], a groove [8,9], etc. This method is widely known as the passive technique, a technique that extends the surface heat transfer area through a surface modification and surface extension with minor changes in the diameter, without using any additive and energy input, yet is easy to install [10].…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement and Friction in Double Pipe Heat Exchanger With Various Number of Longitudinal Grooves

Sunu¹,

Anakottapary²,

Suarta³

et al. 2020

Acta Polytech

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It has been found out that heat exchangers with longitudinal grooves produce better heat transfer than those without longitudinal grooves. However, up to now, there have been few investigations and applications of longitudinal grooves in relation to heat transfer associated with friction from the annulus of a heat exchanger. The present investigation examined the effects of longitudinal grooves in a double pipe heat exchanger on the characteristics of heat transfer and friction. Longitudinal rectangular grooves were carved into the outer side of a tube at a specified depth (t) and width (l). The effect of the number of longitudinal grooves, Reynolds number (Re), on the thermal and hydraulic performance was evaluated based on the heat exchanger experimental data. A total of four pipes were used: one pipe with 2 grooves, one pipe with 4 grooves, one pipe with 6 grooves and one pipe with 8 grooves. Water, hot and cold, was used as the working fluid. The test was performed with the cold water as the working fluid, with the Reynolds number from about 33 000 to 46 000 in a counter-flow scheme. The result showed that the number of grooves improved the heat transfer and caused a pressure drop. The increase in heat transfer ranged from 1.05 to 1.15, and the pressure loss of the system reached almost 30% as compared with the smooth annulus, the annulus with no groove. The installation of longitudinal grooves in a heat exchanger system enhanced the process of the heat flow through the boundary but provided a compensation for the pressure loss, which was correlated with the friction and pumping power.

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Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement and Friction in Double Pipe Heat Exchanger With Various Number of Longitudinal Grooves

Sunu¹,

Anakottapary²,

Suarta³

et al. 2020

Acta Polytech

Self Cite

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“…Heat exchanger plays an important role in energy transfer, conservation, convertion and recovery. Their function for handling the thermal energy in many industrial applications, such as refrigeration and air conditioning power plants, waste heat recovery, chemical, automotive, food handling and many other application [1][2][3]. Inlet and outlet temperature of heat heat exchanger and mass flowrate of each fluid became two important parameters to see the heat exchanger performance.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Study on Fan Coil Unit Of Water Chiller With Nanofluid Al2O3 as Chilled Water

Sunu¹,

Anakottapary²,

Susila³

et al. 2018

Proceedings of the International Conference on Science and Technology (ICST 2018)

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Heat exchanger has wide use in many application such as in food industries, chemical, transportation, and refrigeration and air conditioning. Fan coil unit (FCU), one class of heat exchanger which is heat transfer occur by chilled water flowing across a series of finned tube bank for decreasing the air temperature to be cooled. Thermal conductivity of working fluid in heat exchanger was the main issue recently. Enhancement of convective heat transfer and thermal conductivity of working fluid made possible by mixing nanosize particle into base fluid. The aims of this research is to revealed the enhanced of heat transfer by nanofluid Al2O3 on FCU unit of chiller system. 0,2% of nanoparticles were added to chilled water. The analysis shows that added small part of nanoparticles induced heat transfer. The total heat transfer enhancement of nanofluid chilled water was about 8.0% -11.1% compare to that of chilled water without nanoparticles. Finally, the application of nanoparticles give benefit of heat transfer process.

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Performance assessment on double pipe heat exchanger with longitudinal groove

Sunu

Darmawa

Sutarna

et al. 2020

J. Phys.: Conf. Ser.

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Thermal performances were performed as preliminary research on double pipe heat exchanger with low number of longitudinal groove. The objective of this work is to determine optimal heat transfer parameter especially logarithmic temperature difference (LMTD) as a time series function. The thermal analysis in this paper also provide total number of heat absorb in the cold fluid. The rectangular-longitudinal grooves were incised on outer surface of tube side with number of longitudinal grooves of 2. The grooves high and width were kept constant at 0.3 mm and 1 mm respectively. The tube made of aluminium with outer diameter is 20 mm. The shell is made of acrylic which has 26 mm in internal diameter. Water is used as the working fluid with counter flow scheme. The volume flowrate of cold fluid was varied from 18x10^-5 m^ 3/s up to 25x10^-5 m^ 3/s which are equal to Reynold number (Re) around 31981 to 43610. The volume flowrate of hot fluid remains constant at 25x10^-5 m^ 3/s which is equal to (Re) around 30904. The LMTD of 2 grooves double pipe heat exchanger was better compared to that of the smooth one since the thermal sectional area are increased which essentially cause larger heat transfer.

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Heat Transfer Enhancement and Pressure Drop of Grooved Annulus of Double Pipe Heat Exchanger

Cited by 10 publications

References 27 publications

Heat Transfer Enhancement and Friction in Double Pipe Heat Exchanger With Various Number of Longitudinal Grooves

Heat Transfer Enhancement and Friction in Double Pipe Heat Exchanger With Various Number of Longitudinal Grooves

Heat Transfer Study on Fan Coil Unit Of Water Chiller With Nanofluid Al2O3 as Chilled Water

Performance assessment on double pipe heat exchanger with longitudinal groove

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