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Numerical investigation of air curtain velocity ratio in an open refrigerated display cabinet with dual air curtain.

Number: 853

Author(s) : CHENG P. S., HSIEH C. H., YU P.

Summary

The protective effect of air curtains in open refrigerated display cabinets (ORDCs) was investigated by two simulation models. In model A, the velocity of the 5 oC inner air curtain was maintained at 2 m/s and the 8 oC outer air curtain varied from 1 to 3.33 m/s, leading to the velocity ratio ranging from 0.67 to 4. The simulation results showed that the dual air curtain performed best with a velocity ratio of 1.33, resulting in a TEF of 0.21 and a cooling load of 0.48 kW. The ORDC performed worse with outer air curtain velocity that was either too fast or too slow. Model B fixed the total air mass flow rate of the dual air curtain at 67% inner and 33% outer. Compared with a velocity ratio of 4, TEF and cooling load with a velocity ratio of 0.6 increased by 33% and 26%, respectively. Both simulation models showed that a slower velocity for the outer air curtain was more effective in preventing hot ambient air infiltration.

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Details

  • Original title: Numerical investigation of air curtain velocity ratio in an open refrigerated display cabinet with dual air curtain.
  • Record ID : 30031320
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0853

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