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Design optimization of an air-cooled bifurcated tube heat exchanger.

Number: pap. n. 571

Author(s) : HUANG Z., LING J., AUTE V., et al.

Summary

Air-cooled heat exchangers are a major research topic due to their significance in air-conditioning and heat pump systems. Such heat exchangers, mainly fin-and-tube and minichannel types, use fins to augment the air-side heat transfer area. Whereas, researchers found heat exchangers using small diameter (< 2 mm) bare tubes can achieve two times higher airside heat transfer coefficient than conventional ones with finned tubes. In this study, a novel finless air-cooled heat exchanger consisting of two-level bifurcated bare tubes is proposed and optimized using approximation assisted optimization methodology. Optimization objectives are minimization of total pumping power and heat exchanger envelope volume. Optimization results show that this heat exchanger has 38% less pumping power and 83% smaller volume compared with baseline heat exchanger (louvered fin minichannel) having same frontal area under same operating conditions. The key feature of current design is the addition of bifurcation, which enhances both air- and water-side heat transfer by boundary layer interruption and redevelopment. Although several manufacturing issues need to be further addressed, this heat exchanger is a promising next generation heat exchanger design.

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Details

  • Original title: Design optimization of an air-cooled bifurcated tube heat exchanger.
  • Record ID : 30026430
  • 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.2019.0571

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