Response Surface Based Optimization of Ribbed Isosceles Triangular Twisted Tape Heat Exchanger Using Entropy Augmentation Generation Number With Al2o3 Nano Working Fluid

Kumar, K. Suresh; Siddhardha, R.; Raju, Ramabhadri; Kumar, K. Sudheer

doi:10.18186/thermal.544396

Cited by 2 publications

(1 citation statement)

References 24 publications

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“…Recently, Bayareh [19] have shown a significant rise in Nusselt number with corrugated tube and Water-CuO nanofluid. Triangular twisted tape with nanofluids by Pavan Kumar [20] has also that compound method with inserts and nanofluid can result in better optimization.…”

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation of Thermo-Hydraulic Performance Index of a Double Pipe Heat Exchanger Using Double Sided Louvered Winglet Tape

Thejaraju

Girisha²,

Manjunath³

et al. 2020

Journal of Thermal Engineering

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The decade has witnessed great importance of numerical techniques for scientists and researchers in deciding the correctness, stability, and reliability of new designs. In the present study a numerical technique has been implemented to investigate the thermo-hydraulic performance of the Louvered winglet tape inside the tube section of the double pipe heat exchanger. The Louvered winglet tape has been examined with the slope angle of 50, 100, 150 and 210 to study their thermal characteristics. The Reynolds number 4000-30000 was examined on slope angle of 50, 100, 150 and 210 to study their flow characteristics in the turbulent domain. A smooth pipe was examined to evaluate heat transfer characteristics in terms of Nusselt number and friction coefficient over augmented tube with Louvered winglet tape. The results show a satisfactory performance of Louvered winglet tape over the smooth tube with a similar trend of friction factor, Nusselt number, and thermo-hydraulic performance index (THPI). The percentage of increment of the Nusselt number of the results is found to be 237.04%, 258.4%, 275.11%, and 289.72% when compared to smooth pipe with respect to slope angle of 50, 100, 150 and 210, respectively. The amount of increase in the friction factor in comparison with plain tube is 5.13, 6.73, 8.33, and 11.73 times of that of smooth pipe with respect to slope angle of 50, 100, 150 and 210, respectively. The Louvered winglet tape with slope angle 150 has shown to be promising with respect to higher THPI when considering with other slope angle of 50, 100, and 210. The maximum THPI of 1.85 was obtained for slope angle 150 at Re 12000. Similarly, the THPI values for other slope angle 50, 100, and 210 are 1.71, 1.78 and 1.69. In addition to better performance the Louvered winglet tape can be easily fabricated and adapted for a wide variety of heat transfer industries.

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Section: Introductionmentioning

confidence: 99%

Numerical Evaluation of Thermo-Hydraulic Performance Index of a Double Pipe Heat Exchanger Using Double Sided Louvered Winglet Tape

Thejaraju

Girisha²,

Manjunath³

et al. 2020

Journal of Thermal Engineering

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Experimental study of a stand-alone earth to air heat exchanger for heating and cooling in arid regions

Sakhri

Menni

Ameur

et al. 2021

Journal of Thermal Engineering

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Earth to air heat exchanger EAHE is a renewable technique based on a geothermal source. Arid regions are characterised by hard winter and summer weather conditions, which lead to a large thermal discomfort for the big part of the year. In this paper, we study by experiments the performance of stand-alone earth-to-air heat exchanger without external devices (fans, etc.), but only with the local climatic conditions of the region of Bechar (located in the Southwest of Algeria). The EAHE contains a PVC pipe with 66 meters of length and 110 mm of diameter, and it is buried at a depth of 1.5 m in an agriculture zone, where the annual undisturbed subsoil at 1.5 m is 28°C. The stand-alone EAHE has the capacity to raise the air temperature by 10°C in the heating regime and reduce it by 11.9°C in the cooling regime. Furthermore, the relative humidity is raised by19% in the humidification regime and reduced by 27% in the dehumidification regime. The daily working regime was: 62.5% of heating (from 00h to 08h and from 18h to 23h) and 37.5% of cooling (from 09h to 17h) for the thermal regime, 62.5% of dehumidification (from 00h to 09h and from 18h to 23h) and 37.5% of humidification (from 10h to 17h) for the hygrometric regime. The stand-alone EAHE technique presents a great potential for the pre-heating, pre-cooling, and natural ventilation of dwellings and buildings in arid regions.

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Response Surface Based Optimization of Ribbed Isosceles Triangular Twisted Tape Heat Exchanger Using Entropy Augmentation Generation Number With Al2o3 Nano Working Fluid

Cited by 2 publications

References 24 publications

Numerical Evaluation of Thermo-Hydraulic Performance Index of a Double Pipe Heat Exchanger Using Double Sided Louvered Winglet Tape

Numerical Evaluation of Thermo-Hydraulic Performance Index of a Double Pipe Heat Exchanger Using Double Sided Louvered Winglet Tape

Experimental study of a stand-alone earth to air heat exchanger for heating and cooling in arid regions

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