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Improved tubes in multitubular heat exchangers for refrigeration.

Tubes améliorés dans les échangeurs multitubulaires pour la production de froid.

Author(s) : LETERRIBLE P.

Type of article: Article

Summary

The application of inner-grooved copper tubes in shell and tube heat exchangers leads to a significant increase in the refrigeration capacity with refrigerants like R407C and R134a and on the top of that, to a reduction in the diameter of tubes and greater compactness with R410A. The increase in the internal surface area is 1.78 for the HVA profile developed by KME. The settlement of the precise thermal correlation for inner-grooved tubes leads to the calculation of the heat-exchange coefficient in evaporation mode whatever the running conditions (evaporation, temperature, heat flux, mass flow rate, tube geometry). A numerical application has been established by the study for the tube ref. 95245HVA40/82A in evaporation of R410A at 5°C and heat flux of 10 000 W/m2 which brings a gain for the internal heat-exchange coefficient of 1.9 to 2.4 according to the vapour quality. Similarly, the study shows for flooded evaporators, the application of new finned copper tubes brings on an important gain for the external heat-exchange coefficients: 27 to 42% for two finned tubes ref. BII and BIII in comparison to those of smooth tubes.

Details

  • Original title: Tubes améliorés dans les échangeurs multitubulaires pour la production de froid.
  • Record ID : 2010-0065
  • Languages: French
  • Source: Rev. gén. Froid - vol. 99 - n. 1094
  • Publication date: 2009/06

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