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PERFORMANCE IMPROVEMENT OF DOUBLE-TUBE GAS COOLER IN CO2 REFRIGERATION SYSTEM USING NANOFLUIDS

ABSTRACT
The theoretical analyses of the double-tube gas cooler in transcritical carbon dioxide refrigeration cycle have been performed to study the performance improvement of gas cooler as well as CO2 cycle using Al2O3, TiO2, CuO and Cu nanofluids as coolants. Effects of various operating parameters (nanofluid inlet temperature and mass flow rate, CO2 pressure and particle volume fraction) are studied as well. Use of nanofluid as coolant in double-tube gas cooler of CO2 cycle improves the gas cooler effectiveness, cooling capacity and COP without penalty of pumping power. The CO2 cycle yields best performance using Al2O3-H2O as a coolant in double-tube gas cooler followed by TiO2-H2O, CuO-H2O and Cu-H2O. The maximum cooling COP improvement of transcritical CO2 cycle for Al2O3-H2O is 25.4%, whereas that for TiO2-H2O is 23.8%, for CuO-H2O is 20.2% and for Cu-H2O is 16.2% for the given ranges of study. Study shows that the nanofluid may effectively use as coolant in double-tube gas cooler to improve the performance of transcritical CO2 refrigeration cycle.
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PAPER SUBMITTED: 2012-07-02
PAPER REVISED: 2013-03-16
PAPER ACCEPTED: 2013-09-14
PUBLISHED ONLINE: 2013-09-22
DOI REFERENCE: https://doi.org/10.2298/TSCI120702121S
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2015, VOLUME 19, ISSUE Issue 1, PAGES [109 - 118]
REFERENCES
  1. Kim, M., Pettersen, J., Bullard C.W., Fundamental process and system design issues in CO2 vapour compression systems, Progress in Energy and Combustion Science, 30 (2004), 2, pp. 119-174.
  2. Austin, B.T., Sumathy, K., Transcritical carbon dioxide heat pump systems: A review, Renewable and Sustainable Energy Reviews, 15 (2011), 8, pp. 4013-4029.
  3. Rigola, J., Raush, G., Pe´rez-Segarra, C.D., Oliva, A., Numerical simulation and experimental validation of vapour compression refrigeration systems. Special emphasis on CO2 trans-critical cycles, International Journal of Refrigeration, 28 (2005), pp. 1225-1237.
  4. Cabello R., Sa´nchez, D., Llopis, R., Torrella, E., Experimental evaluation of the energy efficiency of a CO2 refrigerating plant working in transcritical conditions, Applied Thermal Engineering, 28 (2008), pp. 1596-1604.
  5. Sarkar, J., Bhattacharyya, S., Ramgopal, M., A transcritical CO2 heat pump for simultaneous water cooling and heating: Test results and model validation, International Journal of Energy Research, 33 (2009), 1, pp. 100-109.
  6. Sa´nchez, D., Torrella, E., Cabello, R., Llopis, R., Influence of the superheat associated to a semihermetic compressor of a transcritical CO2 refrigeration plant, Applied Thermal Engineering, 30 (2010), pp. 302-309.
  7. Wong, K.V., Leon, O.D., Applications of Nanofluids: Current and Future, Advances in Mechanical Engineering, (2010), Article ID 519659.
  8. Liu, L., Kim, E.S., Park, Y.G., Jacobi, A.N., The potential impact of nano-fluid enhancements on the performance of heat exchangers, Heat Transfer Engineering, 33 (2011), 1, pp. 31-41.
  9. Chun, B.H., Kang, H.U., Kim, S.H., Effect of alumina nanoparticles in the fluid on heat transfer in double-pipe heat exchanger system, Korean Journal of Chemical Engineering, 25 (2008), 5, pp. 966-971.
  10. Duangthongsuk, W., Wongwises, S., Heat transfer enhancement and pressure drop characteristics of TiO2-water nanofluid in a double-tube counter flow heat exchanger, International Journal of Heat and Mass Transfer, 52 (2009), pp. 2059-2067.
  11. Fard, M H., Talaie, M.R., Nasr, S., Numerical and experimental investigation of heat transfer of ZnO/Water nanofluid in the concentric tube and plate heat exchangers, Thermal Science, 15 (2011), 1, pp. 183-194.
  12. Zamzamian, A., Oskouie, S.N., Doosthoseini, A., Joneidi, A., Pazouki, M., Experimental investigation of forced convective heat transfer coefficient in nanofluids of Al2O3/EG and CuO/EG in a double pipe and plate heat exchangers under turbulent flow, Experimental Thermal and Fluid Science, 35 (2011), 3, pp. 495-502.
  13. Sarkar, J., Bhattacharyya, S., Ramgopal, M., CO2 heat pump dryer: Part 1. Mathematical model and simulation, Drying Technology, 24 (2006), 1583-1591.
  14. Sarkar, J., Performance of nanofluid-cooled shell and tube gas cooler in transcritical CO2 refrigeration systems, Applied Thermal Engineering, 31 (2011), 14-15, pp. 2541-2548.
  15. Pitla, S.S., Groll, E.A., Ramadhyani, S., New correlation to predict the heat transfer coefficient during in-tube cooling of turbulent supercritical CO2. International Journal of Refrigeration, 25 (2002), pp. 887-895.
  16. Xuan, Y., Li, Q., Investigation of convective heat transfer and flow features of nanofluids, Journal of Heat Transfer, 125 (2003), pp. 151-155.
  17. Yu, W., Choi, S.U.S., The role of interfacial layers in the enhanced thermal conductivity of nanofluids: a renovated Maxwell model, Journal of Nanoparticle Research, 5 (2003), pp. 167-171.
  18. Vajjha, R.S., Das, D.K., Kulkarni, D.P., Development of new correlations for convective heat transfer and friction factor in turbulent regime for nanofluids, International Journal of Heat and Mass Transfer, 53 (2010), pp. 4607-4618.
  19. Sarkar, J., A critical review on convective heat transfer correlations of nanofluids, Renewable & Sustainable Energy Reviews, 15 (2011), 6, pp. 3271-3277.

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