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Experimental study on condensation heat transfer of R454B inside small diameter microfin tube.

Number: 2373

Author(s) : MAINIL A. K., UBUDIYAH H., SAKAMOTO N., KARIYA K., MIYARA A.

Summary

The phase-down of the use of HFCs and high Global Warming Potential (GWP) refrigerants are accelerated all around the globe. R410A, which is currently widely used in HVAC&R systems, has a high GWP of 2088. Therefore, exploration of alternative refrigerants is needed to protect the global environment and in response to regulations related to the restriction of refrigerants with high GWP. R454B emerged as the top candidate for replacement because it has a GWP of 466 (78% reduction from R410A) with the properties and performance are close matches to that of R410A. R454B is a zeotropic mixture refrigerant made of R1234yf and R32 (31.1% and 68.9% in mass). However, the concern now is because this refrigerant is still classified as an A2L category, which is still mildly flammable. One proposed solution is to reduce the amount of refrigerant charge by applying it to a small diameter microfin tube. The present study examines the condensation heat transfer of R454 B inside a 3.5 mm OD horizontal microfin tube. The condensation heat transfer coefficient was measured for mass velocity ranging between 50 kg m-2s-1 and 200 kg m-2s-1, vapor quality from 0.1 to 0.9, and saturation temperature of around 20°C. The effects of mass velocity and vapor quality were analyzed and discussed. The experimental data was compared to a correlation for pure refrigerants.

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  • Original title: Experimental study on condensation heat transfer of R454B inside small diameter microfin tube.
  • Record ID : 30030700
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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