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Comparison on evaporation heat transfer between R32/R1234yf and R32/R1234ze(E) flowing in horizontal microfin tubes.

Number: pap. 2244

Author(s) : NAKAMURA S., KONDOU C., TAKATA N., et al.

Summary

Refrigerant mixtures R32/R1234yf and R32/R1234ze(E) are considered to be the low GWP alternatives to R32 and R410A used in air conditioners. However, according to recent reports, severe heat transfer degradation occurs during the evaporation process. This implies that much larger heat exchangers are required to maintain the COP and cooling/heating capacity to adapt to R32/R1234yf and R32/R1234ze(E). The effects of the components and composition of the mixture on the heat transfer degradation are experimentally investigated in this study. The heat transfer coefficient of the two mixtures and their individual components, i.e., R32, R1234yf and R1234ze(E), are experimentally quantified using horizontal copper microfin tubes with 6.00-mm outer diameters and 48, 58, and 64 fins, with 0.26-mm heights and 19° helical angles. The evaporation test is conducted at an average saturation temperature of 10°C, a heat flux of 10 kW m-2, and mass fluxes from 150 to 400 kg m-2s-1.

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Pages: 9

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Details

  • Original title: Comparison on evaporation heat transfer between R32/R1234yf and R32/R1234ze(E) flowing in horizontal microfin tubes.
  • Record ID : 30018937
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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