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Condensation and evaporation of R744/R32/R1234ze(E) flow in horizontal microfin tubes.

Number: pap. 2337

Author(s) : KONDOU C., MISHIMA F., LIU J. F., et al.

Summary

The heat transfer characteristics of a low global warming potential (GWP) refrigerant mixture R744/R32/R1234ze(E) in a horizontal microfin tube were investigated in this study. The condensation heat transfer coefficient of R744 /R32/R1234ze(E) (9/29/62 mass%) is somewhat lower than that of other mixtures R744/R32/R1234ze(E) (4/43/53 mass%), R32/R1234ze(E) (40/60 mass%), and (30/70 mass%) at an average saturation temperature of 40°C, mass flux of 200 kg m-2s-1, and heat flux of 10 kWm-2. The temperature glides of R744/R32/R1234ze(E) (9/29/62 mass%), (4/43/53 mass%), R32/R1234ze(E) (30/70 mass%), and (40/60 mass%) are 18, 11, 10, and 8 K, respectively, at 40°C. Likewise, the magnitude of the heat transfer coefficient decrease strongly affected the temperature glide. The data for the evaporation heat transfer coefficient indicated similar effects on the temperature glide. At an average saturation temperature of 10°C, the evaporation heat transfer coefficient of R744/R32/R1234ze(E) (9/29/62 mass%) is slightly lower than that of other mixtures. The temperature glides of R744/R32/R1234ze(E) (9/29/62 mass%), (4/43/53 mass%), R32/R1234ze(E) (30/70 mass%), and (40/60 mass%) are 22, 13, 11, and 9 K, respectively. The pressure gradients of these refrigerants are almost equal, and the difference is within the measurement uncertainty. The experimental pressure gradient agrees well with the predictions proposed for single components.

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Pages: 10 p.

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Details

  • Original title: Condensation and evaporation of R744/R32/R1234ze(E) flow in horizontal microfin tubes.
  • Record ID : 30013230
  • Languages: English
  • Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2014/07/14

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