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Journal of Enhanced Heat Transfer

Publication de 8  numéros par an

ISSN Imprimer: 1065-5131

ISSN En ligne: 1563-5074

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INVESTIGATION OF THERMAL-HYDRODYNAMIC HEAT TRANSFER PERFORMANCE OF R-1234ZE AND R-134A REFRIGERANTS IN A MICROFIN AND SMOOTH TUBE

Volume 23, Numéro 3, 2016, pp. 221-239
DOI: 10.1615/JEnhHeatTransf.2017019585
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RÉSUMÉ

This research is based on R-1234ze that is considered a substitute for R-134a due to its low global warming potential in a microfin tube with outer diameter 9.52 mm, the number of fins 70, and fin height 0.17 mm. In comparison, a smooth tube with similar geometries was used to study pressure drop and heat transfer coefficients related to the two fluids. The microfin tube was brazed inside a stainless steel tube and heated electrically. T-type thermocouples were used to measure the temperature distribution during the phase change process. The experimental saturation temperatures and refrigerant mass velocities varied from 10–20°C and 50–300 kg/m2s, respectively. The vapor quality ranged from 0.1 to 0.9 and heat flux from 5 to 11 kW/m2. The results showed that heat transfer performance of R-134a in both microfin and a smooth tube was better than R-1234ze, especially at mass velocities above G = 100 kg/m2s. However, R-1234ze yielded better heat transfer coefficients at mass velocities lower than G = 100 kg/m2s. The pressure gradient of R-1234ze was markedly higher than that of R-134a at all mass flow rates.

CITÉ PAR
  1. Abdul Kaggwa, Carson James K., Atkin Martin, Walmsley Michael, Physical Properties and Rheological Characteristics of Activated Carbon Nanofluids with Varying Filler Fractions and Surfactants, Applied Mechanics and Materials, 884, 2018. Crossref

  2. Kaggwa Abdul, Carson James K., Developments and future insights of using nanofluids for heat transfer enhancements in thermal systems: a review of recent literature, International Nano Letters, 9, 4, 2019. Crossref

  3. Saha Sujoy Kumar, Ranjan Hrishiraj, Emani Madhu Sruthi, Bharti Anand Kumar, Flow Boiling Enhancement Techniques, in Two-Phase Heat Transfer Enhancement, 2020. Crossref

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