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Optimization of copper-tube coils for energy-efficiency and charge reduction in heat pumps, air conditioners and refrigerators.

Number: pap. n. 854

Author(s) : COTTON N., STILLMAN H., NASUTA D., et al.

Summary

Smaller-diameter copper tubes offer favorable thermal performance and material savings but may restrict air and refrigerant flow without proper design. Heat exchangers can be optimized using simulation tools and a multi-objective genetic algorithm (MOGA). The examples in this paper show how to realize performance objectives while meeting design constraints of actual applications. Replacing microchannel aluminum tubes with 5 mm copper tubes in a heat pump application reduced the material mass as much as 28 percent while maintaining equivalent capacity and airside pressure drop. Switching from 6.25 mm to 5 mm tubes in an R600a residential refrigerator reduced the internal tube volume by 41 percent while maintaining acceptable airside pressure drop. In a PTAC application, the target COP was reached while reducing the material cost by 50 percent. These and other applications demonstrate that charge reduction and efficiency gains can be achieved through the use smaller-diameter copper tubes.

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Pages: 8

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Details

  • Original title: Optimization of copper-tube coils for energy-efficiency and charge reduction in heat pumps, air conditioners and refrigerators.
  • Record ID : 30026490
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.0854

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