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Performance enhancement of heat exchangers using eccentric tape inserts and nanofluids

  • Navid Moghaddaszadeh
  • Javad Abolfazli EsfahaniEmail author
  • Omid Mahian
Article
  • 27 Downloads

Abstract

Optimizing the performance of solar collectors and photovoltaic thermal systems that are used for heating/cooling of building as well as electricity generation will efficiently help to approach zero-energy buildings. For this purpose, improving the efficiency of heat exchangers as the main part of solar collectors and photovoltaic thermal systems is necessary. In this paper, two passive methods are employed to ameliorate the efficiency of heat exchangers. To do this, the effect of using Al2O3/water nanofluid in a heat exchanger tube with a swirling flow turbulator was studied. A numerical simulation was carried out to obtain thermal–hydraulic performance in the tube with eccentric helical screw-tape turbulators. The influences of different parameters including nanoparticles volume fraction and eccentricity of tube insert on the performance of heat exchanger are investigated. The results reveal that the coefficient of heat transfer enhances approximately 4.5 times by using nanofluid at nanoparticles volume fraction of 4% with helical turbulator compared to the plain tube at nanoparticles volume fraction of 0%. It was also found that the value of Performance Evaluation Criterion ameliorates as the nanoparticle loading increases. The maximum value of Performance Evaluation Criterion reached 2.2 at nanoparticles volume fraction of 4%, Reynolds number of 4000 and eccentricity of 3. The results of this study reveal the potential of the suggested technique to enhance various thermal systems including solar collectors.

Keywords

Nanofluid Helical screw-tape turbulator Heat exchanger Solar collectors 

List of symbols

Cp

Specific heat capacity (J kg−1 K−1)

d1

Internal diameter of helical screw-tape (m)

d2

Outer diameter of helical screw-tape (m)

D

Tube diameter (m)

e

Eccentricity (mm)

E

Total energy(m2 s−2)

f

Friction factor (−)

h

Heat transfer coefficient (W m−2 k−1)

L

Tube length (m)

Nu

Nusselt number (−)

P

Pressure (Pa)

p

Twist pitch

Pr

Prandtl number (−) (Pr = ν/α)

PR

Pitch ratio (−)

q

Heat flux (W m−2)

r

Tube radius (m)

Re

Reynolds number (−) (Re = ρUinD/μ)

T

Temperature (K)

\(\dot{V}\)

Volume flow rate (m3 s−1)

Greek symbols

δ

Kronecker delta function (−)

λ

Thermal conductivity (W m−1 K−1)

μ

Dynamic viscosity (kg m−1 s−1)

ρ

Density of the fluid (kg m−3)

σ

Turbulent Prandtl number (−)

τ

Wall shear stress (kg m−1)

ϕ

Nanoparticle concentration (−)

Subscripts/superscripts

e

Enhanced tube

in

Inlet

m

Average

0

Smooth tube

Abbreviations

HE

Heat exchanger

HTC

Heat transfer coefficient

NF

Nanofluid

NP

Nanoparticle

PEC

Performance evaluation criterion

SST

Shear stress transport

Notes

Acknowledgements

This research was supported by the Office of the Vice Chancellor for Research, Ferdowsi University of Mashhad, under Grant No. 46494.

References

  1. 1.
    Sun Y, Huang G, Xu X, Lai ACK. Building-group-level performance evaluations of net zero energy buildings with non-collaborative controls. Appl Energy. 2018;212:565–76.  https://doi.org/10.1016/j.apenergy.2017.11.076.CrossRefGoogle Scholar
  2. 2.
    Huang P, Huang G, Sun Y. Uncertainty-based life-cycle analysis of near-zero energy buildings for performance improvements. Appl Energy. 2018;213:486–98.  https://doi.org/10.1016/j.apenergy.2018.01.059.CrossRefGoogle Scholar
  3. 3.
    Herrando M, Markides CN, Hellgardt K. A UK-based assessment of hybrid PV and solar-thermal systems for domestic heating and power: system performance. Appl Energy. 2014;122:288–309.  https://doi.org/10.1016/j.apenergy.2014.01.061.CrossRefGoogle Scholar
  4. 4.
    Herrando M, Markides CN. Hybrid PV and solar-thermal systems for domestic heat and power provision in the UK: techno-economic considerations. Appl Energy. 2016;161:512–32.  https://doi.org/10.1016/j.apenergy.2015.09.025.CrossRefGoogle Scholar
  5. 5.
    Bellos E, Tzivanidis C. Investigation of a star flow insert in a parabolic trough solar collector. Appl Energy. 2018;224:86–102.  https://doi.org/10.1016/j.apenergy.2018.04.099.CrossRefGoogle Scholar
  6. 6.
    Bhattacharyya S, Chattopadhyay H, Haldar A. Design of twisted tape turbulator at different entrance angle for heat transfer enhancement in a solar heater. Beni-Suef Univ J Basic Appl Sci. 2017;7:118–26.  https://doi.org/10.1016/j.bjbas.2017.08.003.CrossRefGoogle Scholar
  7. 7.
    Song X, Dong G, Gao F, Diao X, Zheng L, Zhou F. A numerical study of parabolic trough receiver with nonuniform heat flux and helical screw-tape inserts. Energy. 2014;77:771–82.  https://doi.org/10.1016/j.energy.2014.09.049.CrossRefGoogle Scholar
  8. 8.
    Sheikholeslami M, Gorji-Bandpy M, Ganji DD. Effect of discontinuous helical turbulators on heat transfer characteristics of double pipe water to air heat exchanger. Energy Convers Manag. 2016;118:75–87.  https://doi.org/10.1016/j.enconman.2016.03.080.CrossRefGoogle Scholar
  9. 9.
    Chang C, Peng X, Nie B, Leng G, Li C, Hao Y, et al. Heat transfer enhancement of a molten salt parabolic trough solar receiver with concentric and eccentric pipe inserts. Energy Procedia. 2017;142:624–9.  https://doi.org/10.1016/j.egypro.2017.12.103.CrossRefGoogle Scholar
  10. 10.
    Lim KY, Hung YM, Tan BT. Performance evaluation of twisted-tape insert induced swirl flow in a laminar thermally developing heat exchanger. Appl Therm Eng. 2017;121:652–61.  https://doi.org/10.1016/j.applthermaleng.2017.04.134.CrossRefGoogle Scholar
  11. 11.
    Eiamsa-ard S, Promvonge P. Heat transfer characteristics in a tube fitted with helical screw-tape with/without core-rod inserts. Int Commun Heat Mass Transf. 2007;34:176–85.  https://doi.org/10.1016/j.icheatmasstransfer.2006.10.006.CrossRefGoogle Scholar
  12. 12.
    Zhang X, Liu Z, Liu W. Numerical studies on heat transfer and friction factor characteristics of a tube fitted with helical screw-tape without core-rod inserts. Int J Heat Mass Transf. 2013;60:490–8.  https://doi.org/10.1016/j.ijheatmasstransfer.2013.01.041.CrossRefGoogle Scholar
  13. 13.
    Rashidi S, Zade NM, Esfahani JA. Thermo-fluid performance and entropy generation analysis for a new eccentric helical screw tape insert in a 3D tube. Chem Eng Process Process Intensif. 2017.  https://doi.org/10.1016/j.cep.2017.03.013.Google Scholar
  14. 14.
    Liu X, Li C, Cao X, Yan C, Ding M. Numerical analysis on enhanced performance of new coaxial cross twisted tapes for laminar convective heat transfer. Int J Heat Mass Transf. 2018;121:1125–36.  https://doi.org/10.1016/j.ijheatmasstransfer.2018.01.052.CrossRefGoogle Scholar
  15. 15.
    Moghadas N, Akar S, Rashidi S, Abolfazli J. Thermo-hydraulic analysis for a novel eccentric helical screw tape insert in a three dimensional tube. Appl Therm Eng. 2017;124:413–21.  https://doi.org/10.1016/j.applthermaleng.2017.06.036.CrossRefGoogle Scholar
  16. 16.
    Mahian O, Kolsi L, Amani M, Estellé P, Ahmadi G, Kleinstreuer C, et al. Recent advances in modeling and simulation of nanofluid flows-part I: fundamentals and theory. Phys Rep. 2018.  https://doi.org/10.1016/j.physrep.2018.11.004.Google Scholar
  17. 17.
    Mahian O, Kolsi L, Amani M, Estellé P, Ahmadi G, Kleinstreuer C, et al. Recent advances in modeling and simulation of nanofluid flows-part II: applications. Phys Rep. 2018.  https://doi.org/10.1016/j.physrep.2018.11.003.Google Scholar
  18. 18.
    Bellos E, Tzivanidis C. A review of concentrating solar thermal collectors with and without nanofluids. J Therm Anal Calorim. 2018.  https://doi.org/10.1007/s10973-018-7183-1.Google Scholar
  19. 19.
    Wei H, Nor X, Che A, Najafi SG. Recent state of nanofluid in automobile cooling systems. J Therm Anal Calorim. 2018.  https://doi.org/10.1007/s10973-018-7477-3.Google Scholar
  20. 20.
    Sopian K, Alwaeli AHA, Najah A. Thermodynamic analysis of new concepts for enhancing cooling of PV panels for grid-connected PV systems. J Therm Anal Calorim. 2018.  https://doi.org/10.1007/s10973-018-7724-7.Google Scholar
  21. 21.
    Rashidi S, Mahian O, Languri EM. Applications of nanofluids in condensing and evaporating systems: a review. J Therm Anal Calorim. 2018;131:2027–39.  https://doi.org/10.1007/s10973-017-6773-7.CrossRefGoogle Scholar
  22. 22.
    Khanafer K, Vafai K. A review on the applications of nanofluids in solar energy field. Renew Energy. 2018;123:398–406.  https://doi.org/10.1016/j.renene.2018.01.097.CrossRefGoogle Scholar
  23. 23.
    Khanafer K, Vafai K. Applications of nanofluids in porous medium: a critical review. J Therm Anal Calorim. 2018.  https://doi.org/10.1007/s10973-018-7565-4.Google Scholar
  24. 24.
    Raei B, Shahraki F, Jamialahmadi M, Peyghambarzadeh SM. Experimental study on the heat transfer and flow properties of γ-Al2O3/water nanofluid in a double-tube heat exchanger. J Therm Anal Calorim. 2017;127:2561–75.  https://doi.org/10.1007/s10973-016-5868-x.CrossRefGoogle Scholar
  25. 25.
    Sundar LS, Singh MK, Punnaiah V, Sousa ACM. Experimental investigation of Al2O3/water nanofluids on the effectiveness of solar flat-plate collectors with and without twisted tape inserts. Renew Energy. 2018;119:820–33.  https://doi.org/10.1016/j.renene.2017.10.056.CrossRefGoogle Scholar
  26. 26.
    Syam Sundar L, Singh MK, Sousa ACM. Heat transfer and friction factor of nanodiamond-nickel hybrid nanofluids flow in a tube with longitudinal strip inserts. Int J Heat Mass Transf. 2018;121:390–401.  https://doi.org/10.1016/j.ijheatmasstransfer.2017.12.096.CrossRefGoogle Scholar
  27. 27.
    Sheikholeslami M, Jafaryar M, Li Z. Nanofluid turbulent convective flow in a circular duct with helical turbulators considering CuO nanoparticles. Int J Heat Mass Transf. 2018;124:980–9.  https://doi.org/10.1016/j.ijheatmasstransfer.2018.04.022.CrossRefGoogle Scholar
  28. 28.
    Esmaeilzadeh E, Almohammadi H, Nokhosteen A, Motezaker A, Omrani AN. Study on heat transfer and friction factor characteristics of γ-Al2O3/water through circular tube with twisted tape inserts with different thicknesses. Int J Therm Sci. 2014;82:72–83.  https://doi.org/10.1016/j.ijthermalsci.2014.03.005.CrossRefGoogle Scholar
  29. 29.
    Sheikholeslami M, Jafaryar M, Ganji DD, Li Z. Exergy loss analysis for nanofluid forced convection heat transfer in a pipe with modified turbulators. J Mol Liq. 2018;262:104–10.  https://doi.org/10.1016/j.molliq.2018.04.077.CrossRefGoogle Scholar
  30. 30.
    Bellos E, Tzivanidis C, Tsimpoukis D. Enhancing the performance of parabolic trough collectors using nanofluids and turbulators. Renew Sustain Energy Rev. 2018;91:358–75.  https://doi.org/10.1016/j.rser.2018.03.091.CrossRefGoogle Scholar
  31. 31.
    Akyürek EF, Geliş K, Şahin B, Manay E. Experimental analysis for heat transfer of nanofluid with wire coil turbulators in a concentric tube heat exchanger. Results Phys. 2018;9:376–89.  https://doi.org/10.1016/j.rinp.2018.02.067.CrossRefGoogle Scholar
  32. 32.
    Zheng L, Xie Y, Zhang D. Numerical investigation on heat transfer performance and flow characteristics in circular tubes with dimpled twisted tapes using Al2O3–water nanofluid. Int J Heat Mass Transf. 2017;111:962–81.  https://doi.org/10.1016/j.ijheatmasstransfer.2017.04.062.CrossRefGoogle Scholar
  33. 33.
    Rashidi S, Eskandarian M, Mahian O, Poncet S. Combination of nanofluid and inserts for heat transfer enhancement. J Therm Anal Calorim. 2018.  https://doi.org/10.1007/s10973-018-7070-9.Google Scholar
  34. 34.
    Albojamal A, Vafai K. Analysis of single phase, discrete and mixture models, in predicting nanofluid transport. Int J Heat Mass Transf. 2017;114:225–37.  https://doi.org/10.1016/j.ijheatmasstransfer.2017.06.030.CrossRefGoogle Scholar
  35. 35.
    Bovand M, Rashidi S, Esfahani JA. Enhancement of heat transfer by nanofluids and orientations of the equilateral triangular obstacle. Energy Convers Manag. 2015;97:212–23.  https://doi.org/10.1016/j.enconman.2015.03.042.CrossRefGoogle Scholar
  36. 36.
    Parsazadeh M, Mohammed HA, Fathinia F. Influence of nanofluid on turbulent forced convective flow in a channel with detached rib-arrays. Int Commun Heat Mass Transf. 2013;46:97–105.  https://doi.org/10.1016/j.icheatmasstransfer.2013.05.006.CrossRefGoogle Scholar
  37. 37.
    Menter FR. Two-equation eddy-viscosity turbulence models for engineering applications. AIAA. 1994;32:1598–605.CrossRefGoogle Scholar
  38. 38.
    Webb RL. Performance evaluation criteria for use of enhanced heat transfer surfaces in heat exchanger design. Int J Heat Mass Transf. 1981;24:715–26.  https://doi.org/10.1016/0017-9310(81)90015-6.CrossRefGoogle Scholar
  39. 39.
    Eiamsa-Ard S, Promvonge P. Thermal characteristics in round tube fitted with serrated twisted tape. Appl Therm Eng. 2010;30:1673–82.  https://doi.org/10.1016/j.applthermaleng.2010.03.026.CrossRefGoogle Scholar
  40. 40.
    Patankar SV. Numerical heat transfer and fluid flow. New York: Hemisphere; 1980.Google Scholar

Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • Navid Moghaddaszadeh
    • 1
  • Javad Abolfazli Esfahani
    • 1
    Email author
  • Omid Mahian
    • 2
    • 3
  1. 1.Department of Mechanical EngineeringFerdowsi University of MashhadMashhadIran
  2. 2.School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’anChina
  3. 3.Center for Advanced TechnologiesFerdowsi University of MashhadMashhadIran

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