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The two-phase flow boiling heat transfer coefficient of r448a inside multiport mini-channel tube.

Number: 2589

Author(s) : HIEU H. N., AGUSTIARINI N., OH J. T.

Summary

New regulations and restrictions against high GWP refrigerant have pressured the industry into adopting more environmentally friendly refrigerants. In this work, the heat transfer coefficient of a more recent zeotropic blend R448A inside multiport mini-channel tube was experimentally investigated. The mass flux range was from 100 to 500 kg/m2s, heat flux from 3 to 15 kW/m2, covering quality from 0 to 1 at fixed inlet temperature of 6°C and 3°C. It was found that the heat transfer coefficient increased with increased mass flux. Heat flux increased the heat transfer coefficient under low mass flux condition, while having no significant effect in high mass flux condition. A comparison was made between R448A and R410A inside a same test tube and it was found that R448A’S heat transfer coefficient was higher than R410A at low mass flux, but has similar order of magnitude in high mass flux conditions. Pressure drop of R448A increase with increased mass flux, and vapor quality, while heat flux displayed no significant effect on heat transfer coefficient. Finally, a simple heat transfer correlation was proposed for the practical prediction of R448A heat transfer coefficient within multiport mini-channel tube.

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  • Original title: The two-phase flow boiling heat transfer coefficient of r448a inside multiport mini-channel tube.
  • Record ID : 30030785
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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