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Experimental study on the application of a parallel dual-tube microchannel evaporator in direct-cooling freezers.

Author(s) : HUANG T., SUN B., WANG G., DONG A., SONG Q., ZHOU S., WANG D.

Type of article: IJR article

Summary

In order to enhance the performance of direct-cooling freezers and reduce their energy consumption, a parallel dual-tube microchannel evaporator was proposed to replace the traditional D-shaped heat transfer tubes, as the latter performs poorly in terms of thermal performance and fluid flow performance. A freezer with a new evaporator design was developed and experimentally investigated. Based on test data, the energy consumption and main thermodynamic parameters of the D-shaped tube freezer and the microchannel freezer were compared under the same operating conditions. The results showed that the parallel dual-tube microchannel freezer achieved reductions of 6.5% in daily energy consumption, 8.8% in compressor on-time ratio, 9.6% in refrigerant charge, and 6.7% in pull-down time compared to the D-shaped tube freezer. Furthermore, the refrigerant in this microchannel freezer had a lower thermal resistance and a higher evaporation temperature, along with a significantly lower evaporator pressure drop and a reduced compression pressure ratio. These findings  emonstrated that the parallel dual-tube microchannel evaporator design effectively improved the performance of direct-cooling freezers and feasibility of its application in such systems was confirmed.

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Details

  • Original title: Experimental study on the application of a parallel dual-tube microchannel evaporator in direct-cooling freezers.
  • Record ID : 30034775
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 185
  • Publication date: 2026/05
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2026.02.019

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