Role of nanofluids in solar water heater

SPECIAL ISSUE - ORIGINAL ARTICLE

Abstract

Heat transfer enhancement in solar devices is one of the key issues of energy saving and compact designs. Researches in heat transfer have been carried out over the previous several decades, leading to the development of the currently used heat transfer enhancement techniques. The use of additives is a technique applied to enhance the heat transfer performance of base fluids. Recently, as an innovative material, nanosized particles have been used in suspension in conventional heat transfer fluids. The fluids with nanosized solid particles suspended in them are called “nanofluids.” The suspended metallic or nonmetallic nanoparticles change the transport properties and heat transfer characteristics of the base fluid. Nanofluids are expected to exhibit superior heat transfer properties compared with conventional heat transfer fluids. The aim of this paper is to analyze and compare the heat transfer properties of the nanofluids with the conventional fluids.

Keywords

Nanofluid Nanoparticles Heat transfer enhancement Solar water heater 

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References

  1. 1.
    Ho CD, Chen TC (2006) The recycle effect on the collector efficiency improvement of double-pass sheet-and-tube solar water heaters with external recycle. Renew Energy 31(7):953–970CrossRefGoogle Scholar
  2. 2.
    Hussain AM (2006) The performance of a cylindrical solar water heater. Renew Energy 31(11):1751–1763CrossRefGoogle Scholar
  3. 3.
    Xiaowu W, Hua B (2005) Energy analysis of domestic-scale solar water heaters. Renew Sustain Energy Rev 9(6):638–645CrossRefGoogle Scholar
  4. 4.
    Xuesheng W, Ruzhu W, Jingyi W (2005) Experimental investigation of a new-style double-tube heat exchanger for heating crude oil using solar hot water. Appl Therm Eng 25(11-12):1753–1763CrossRefGoogle Scholar
  5. 5.
    Ahuja AS (1975) Augmentation of heat transport in laminar flow of polystyrene suspension. J Appl Phys 46(8):3408–3416CrossRefGoogle Scholar
  6. 6.
    Ahuja AS (1975) Augmentation of heat transport in laminar flow of polystyrene suspension. II: analysis of data. J Appl Phys 46:3417–3425CrossRefGoogle Scholar
  7. 7.
    Hetsroni G, Rozenblit R (1994) Heat transfer to a liquid–solid mixture in a flume. Int J Multiph Flow 20(4):671–689MATHCrossRefGoogle Scholar
  8. 8.
    Sohn CW, Chen MM (1981) Micro convective thermal conductivity in disperse two phase mixture as observed in a low velocity Couette flow experiment. J Heat Transfer 103:47–51CrossRefGoogle Scholar
  9. 9.
    Kim P, Shi L, Majumdar A, McEuen PL (2001) Thermal transport measurements of individual multiwalled nanotubes. Phys Rev Lett 87(21):215502CrossRefGoogle Scholar
  10. 10.
    Choi SUS, Zhang ZG, Yu W, Lockwood FE, Grulke EA (2001) Anomalous thermal conductivity enhancement in nanotube suspensions. Appl Phys Lett 79(14):2252CrossRefGoogle Scholar
  11. 11.
    Assael MJ, Chen CF, Metaxa N, Wakeham WA (2004) Thermal conductivity of suspensions of carbon nanotubes in water. Int J Thermophys 25(4):971–985CrossRefGoogle Scholar
  12. 12.
    Hwang Y, Lee JK, Lee CH, Jung YM, Cheong SI, Lee CG, Ku BC, Jang SP (2007) Stability and thermal conductivity characteristics of nanofluids. Thermochimica Acta 455(1–2):70–74CrossRefGoogle Scholar
  13. 13.
    Esumi K, Ishigami M, Nakajima A, Sawada K, Honda H (1996) Chemical treatment of carbon nanotubes. Carbon 34:279–281CrossRefGoogle Scholar
  14. 14.
    Jiang L, Gao L, Sun J (2003) Production of aqueous colloidal dispersions of carbon nanotubes. J Colloid Interface Sci 260:89–94CrossRefGoogle Scholar

Copyright information

© Springer-Verlag London Limited 2008

Authors and Affiliations

  1. 1.Institute for Energy StudiesAnna UniversityChennaiIndia

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