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Investigation on performance and refrigerant distribution of plate evaporator under lower heat flux conditions.

Author(s) : WEI W., XU G., JI J.

Type of article: IJR article

Summary

Refrigerant distribution among channels plays an important role on performance of plate evaporator, especially under low heat flux conditions. Behaviors of plate evaporator under low heat flux condition are comprehensively and experimentally investigated based on distribution pipe solution in this paper. Influences of orifice diameter do, orifice pitch dp and injection orientation φ are figured out on overall heat transfer coefficient (HTC), refrigerant distribution, and superheat oscillation. Results show that do significantly affects evaporator performance compared to dp and φ. The HTC can be improved by 30 % with do deceasing from 1.0 mm to 0.6 mm. φ obviously influences distribution when do ≥ 0.7 mm and such effect is diluted at small orifice diameter. Two categories of distribution profiles are observed: rear flooded – front starved shape for the orientation of -45° and rear starved -front flooded shape for -90°. Refrigerant distribution is dramatically improved when do = 0.6 mm and φ = -45°. Superheat oscillation shows strongly relevant to refrigerant distribution and affects plate evaporator performance distinguishedly. Pressure drop over the orifice is absolutely dominant in total pressure drop of plate evaporator. Flow coefficient of distribution pipe,α is defined and α can be considered as a constant value of 1.15×10−3 for predicting pressure drop and guiding distribution pipe design. The upper and lower deviations between calculated values and test data are within ±8.7 %.

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Pages: 195-207

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Details

  • Original title: Investigation on performance and refrigerant distribution of plate evaporator under lower heat flux conditions.
  • Record ID : 30032222
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 159
  • Publication date: 2024/03
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2023.12.028

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