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A compact reverse Rankine Cycle combines surface enhancement and jet impingement to remove high heat fluxes.

Number: 1214

Author(s) : CARNEIRO M. V. P., PROVENSI A., CAVICCHIOLI P., PEREIRA M., BARBOSA J. R. Jr

Summary

We present an experimental assessment of a compact reverse Rankine cooling system driven by a small-scale oil-free linear compressor. The expansion device (an array of micro orifices) is integrated with the evaporator to produce two-phase jets that impinge on the surface of the element supplying the thermal load. The benefit of the proposed technology for high heat flux applications is twofold: the large heat transfer coefficient associated with spray/jet impingement and the ability to maintain evaporating temperatures equal to or below that of the ambient. Here, the thermal performance of the system is improved even further by using resilient micro structures (micro pillars fabricated by laser ablation) to increase the surface energy and promote higher values of heat transfer coefficient and critical heat flux. In addition to specific quantitative results on the capillary driving force of the enhanced surfaces, we present thermodynamic performance data for the vapor compressor unit. High-speed video sequences illustrate the phase change heat transfer phenomena involved.

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Pages: 8

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Details

  • Original title: A compact reverse Rankine Cycle combines surface enhancement and jet impingement to remove high heat fluxes.
  • Record ID : 30027761
  • Languages: English
  • Subject: Technology
  • Source: IIR Rankine Conference 2020.
  • Publication date: 2020/07/31
  • DOI: http://dx.doi.org/10.18462/iir.rankine.2020.1214

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