THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Ruoyu Dai

,

Xixia Xu

,

Yi Wang

,

Yue Wu

,

Jieqing Zheng

COMPREHENSIVE EVALUATION ON THE THERMAL-HYDRAULIC PERFORMANCE OF SUPERCRITICAL CO2/R41 IN A MICRO-FIN TUBE

ABSTRACT
A 3-D flow and heat transfer theoretical model was established for a 5 mm micro-fin tube to explore the heat transfer and flow characteristics of supercritical CO2/R41 therein under different pressures, mass fluxes, and components. The research attempts to provide reference for selecting components of working media and setting the pressure and mass flux in different application scenarios. Results show that the closer the temperature of the working medium to the critical temperature, the larger the local convective heat transfer coefficient (CHTC). The CHTC at the critical temperature is 8 to 16 times higher compared with that at the non-critical temperature. The maximum CHTC is greater and the temperature corresponding to the maximum CHTC is lower when the mixed working medium is at a pressure closer to the critical pressure. The maximum CHTC under 7.0 MPa is twice that at 8.0 MPa. As the mass flux increases from 400 to 800 kg/m2s, the CHTC at the non-critical temperature increases by 1.7 times, while the comprehensive evaluation results of heat transfer and pressure drop decrease significantly. When the CO2 fraction increases from 20.5% to 75%, the maximum CHTC is increased by 2.6 times.
KEYWORDS
supercritical CO2/R41, micro-fin tube, Heat Transfer Enhancement, drag reduction of flow, numerical simulation
PAPER SUBMITTED: 2022-03-11
PAPER REVISED: 2022-05-13
PAPER ACCEPTED: 2022-05-14
PUBLISHED ONLINE: 2022-07-09
DOI REFERENCE: https://doi.org/10.2298/TSCI220311097D
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 6, PAGES [5173 - 5186]
REFERENCES
  1. Lorentzen G., The use of natural refrigerants: a complete solution to the CFC/HCFC predicament, International Journal of Refrigeration, 18 (1995), 3, pp. 190-197
  2. Oh H., Son C., New correlation to predict the heat transfer coefficient in-tube cooling of supercritical CO2 in horizontal macro-tubes, Experimental Thermal & Fluid Science, 34 (2010), 8, pp. 1230-1241
  3. Pioro I., Current status of research on heat transfer in forced convection of fluids at supercritical pressures, Nuclear Engineering and Design, 354 (2019)
  4. Qwa B., et al., The three-regime-model for pseudo-boiling in supercritical pressure, International Journal of Heat and Mass Transfer, 181 (2021), 121875
  5. Barghi F., et al., Effect of initial wetting state on plastron recovery through heating, International Journal of Heat and Mass Transfer, 156 (2020), 119705
  6. Kim D., Kim M., Experimental investigation of heat transfer in vertical upward and downward supercritical CO2 flow in a circular tube, International Journal of Heat & Fluid Flow, 32(2011), 1, pp. 176-191
  7. Peng R., et al al., Forced convective heat transfer of supercritical carbon dioxide in mini-channel under low mass fluxes, International Journal of Heat and Mass Transfer, 182
  8. Zhang X., et al al., Determination of the optimum heat rejection pressure in transcritical cycles working with R744/R290 mixture, Applied Thermal Engineering, 54 (2013), 1, pp. 176-184
  9. Onaka Y., et al al. Experimental study on evaporation heat transfer of CO2/DME mixture refrigerant in a horizontal smooth tube, International Journal of Refrigeration, 33 (2010), 7, pp.1277-1291
  10. Sarkar J., Bhattacharyya S., Assessment of blends of CO2 with butane and isobutane as working fluids for heat pump applications, International Journal of Thermal Sciences, 48 (2009), 7, pp. 1460-1465
  11. Ali, et al al., Applying refrigerant mixtures with thermal glide in cold climate air-source heat pumps, Applied Thermal Engineering, 62 (2014), 2, pp. 714-722
  12. Kim J., et al al., Cooling performance of several CO2/propane mixtures and glide matching with secondary heat transfer fluid, International Journal of Refrigeration, 31 (2008), 5, pp. 800-806
  13. Kim J., et al al., Circulation concentration of CO2/propane mixtures and the effect of their charge on the cooling performance in an air-conditioning system, International Journal of Refrigeration, 30 (2007), 1, pp. 43-49
  14. Dai B., et al al., Thermodynamic performance assessment of carbon dioxide blends with low-global warming potential (GWP) working fluids for a heat pump water heater, International Journal of Refrigeration, 56 (2015), 1, pp. 1-14
  15. Wang D., et al., Thermodynamic analysis of CO2 blends with R41 as an azeotropy refrigerant applied in small refrigerated cabinet and heat pump water heater, Applied Thermal Engineering, 125 (2017), pp. 1490-1500
  16. Yu B., et al., Experimental energetic analysis of CO2/R41 blends in automobile air-conditioning and heat pump systems, Applied Energy, 239 (2019), pp. 1142-1153
  17. Gradziel S., et al., Experimental determination of the heat transfer coefficient is internally rifled tubes, Thermal Science, (2019), 23, pp. 1163-1174
  18. Lin Y., et al., Numerical investigation on thermal performance and flow characteristics OFZ and S shape PCHE using S-CO2, Thermal Science, (2019), 23, pp. 757-764
  19. Cavallini A., et al., Heat transfer and pressure drop during condensation of refrigerants inside horizontal enhanced tubes, Int J Refrig, 1 (2000), pp. 4-25
  20. Cho J., Kim M., Experimental studies on the evaporative heat transfer and pressure drop of CO2 in smooth and m icro fin tubes of the diameters of 5 and 9.52 mm, Int J Refrig, 30 (2007), 6, pp. 986 994
  21. Al Fahed S., et al ., Pressure drop and heat transfer comparison for both micro fin tube and twisted tape inserts in laminar flow
  22. Kim N., Evaporation heat transfer and pressure drop of R-410A in a 5.0 mm O.D. Smooth and Micro-fin Tube, International Journal of Air-Conditioning and Refrigeration, 23(2015), 1, pp. 1550004
  23. Ding Y., Liu J., Condensation heat transfer of R404A in horizontal inner-threaded tubes, Journal of Engineering for Thermal Energy and Power, 32 (2020), 12, pp. 141-147,168
  24. Moosaie A., et al. al., An algebraic closure model for the DNS of turbulent drag reduction by Brownian microfiber additives in a channel flow, Journal of Non Newtonian Fluid Mechanics, 226 (2015), pp. 60 66
  25. Xie G, et al., Heat transfer behaviors of some supercritical fluids: A review, Chinese Journal of Aeronautics, 35(2022), 1, pp. 290-306
  26. Kim D., Kim M., Two layers heat transfer model for supercritical fluid flow in a vertical tube, The Journal of Supercritical Fluids, (2011), 58, pp. 15-25
  27. Webb R., Heat transfer enhancement of heat exchangers, Prediction of condensation and evapo ration in micro fin and micro channel tubes, Springer, Dordrecht, 1999
  28. Zhang J., et al., Numerical simulation of R410A condensation in horizontal micro-fin tubes, Numerical Heat Transfer Part A Application. An International Journal of Computation & Methodology, 2017
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Comprehensive evaluation on the thermal-hydraulic performance of supercritical CO2/R41 in a micro-fin tube

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence