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Falling film evaporation and pool boiling of HFO1233zd(E) on a low finned tube with thermal spray coating.

Number: 1004

Author(s) : UBARA T., SAWATARI K., SUGIMOTO K., ASANO H.

Summary

A falling film evaporator is attracting attention to reduce the refrigerant filling amount. For heat transfer enhancement of the falling film evaporation, forming and keeping a thin liquid film on the heat transfer surface are important. In this study, thermal spray coating was applied on a low finned tube. The contribution of nucleate boiling in the film evaporation heat transfer of HFO1233zd(E) was evaluated from the comparison in the experimental results of pool boiling using the same test section. The tube length was 50 mm and the diameter at the top of the fins was 19.05 mm. The liquid film flow rate was fixed at 0.033 kg×m–1×s–1 and the heat flux was varied from 10 to 85 kW×m-2. As a result, it was shown that the enhancement factor by the coating was up to 2.0 for falling film evaporation and was higher than the pool boiling.

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Pages: 7

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Details

  • Original title: Falling film evaporation and pool boiling of HFO1233zd(E) on a low finned tube with thermal spray coating.
  • Record ID : 30028775
  • Languages: English
  • Subject: Technology
  • Source: 2nd IIR Conference on HFO Refrigerants and Low GWP Blends
  • Publication date: 2021/06
  • DOI: http://dx.doi.org/10.18462/iir.HFO.2021.1004

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