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Assessment and optimisation of low-GWP refrigerants during two-phase heat transfer inside small-diameter smooth tubes.

Author(s) : LONGO G. A., MANCIN S., RIGHETTI G., ZILIO C., BROWN J. S.

Type of article: IJR article

Summary

This paper presents an assessment of new low-GWP refrigerants through coupling the experimental measurement of thermal and hydraulic performances to a theoretical evaluation based on the Total Temperature Penalisation (TTP) criterion for the specific case study of two-phase heat transfer inside a small-diameter smooth tube. The TTP analysis was also used for process optimisation. The TTP analysis identifies R32 and two hydrocarbon refrigerants R290 and R1270 as the most suitable low-GWP substitutes for R410A and R404A, respectively. R152a, R1234yf and R1234ze(E) are appropriate low-GWP alternatives for R134a, while R1234ze(Z) and R1233zd(E) emerge as appropriate low-GWP, near drop-in substitutes for R245fa. HydroFluoroCarbon (HFC) and HydroFluoroOlefin (HFO) refrigerants possess values of the optimum mass velocity in two-phase heat transfer inside small-diameter smooth tubes nearly double that of HydroCarbon (HC) refrigerants, and the optimum mass velocities for in-tube condensation are generally much higher than those in flow boiling.

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Pages: 61-70

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Details

  • Original title: Assessment and optimisation of low-GWP refrigerants during two-phase heat transfer inside small-diameter smooth tubes.
  • Record ID : 30027507
  • Languages: English
  • Subject: HFCs alternatives
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 117
  • Publication date: 2020/09
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2020.03.022
  • Document available for consultation in the library of the IIR headquarters only.

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