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IIR document

Design of high efficiency compact brazed plate heat exchangers using CFD.

Number: pap. ID: 614

Author(s) : GULLAPALLI V. S.

Summary

The design of plates used in compact brazed plate heat exchangers is traditionally performed by selection of geometric parameters suitable for meeting thermal and hydraulic requirements of a set of applications. The influence of each of the geometric parameters on heat transfer and pressure drop is generally available to the designer in form of equations obtained from laboratory and field tests. Geometry parameters such as chevron angle, pressing depth, corrugation wave length, plate aspect ratio, port diameters are usually optimized for the widely used herring bone plate pattern. In recent days, many high efficient plate patterns are developed which vary significantly in structure and flow characteristics compared to traditional corrugated plate patterns. The lack of generality in the definition of geometric parameters and variation in flow characteristics limit the use of aforementioned prediction equations for design of modern plate patterns. Commercial CFD codes are widely used in industry today for verifying the performance of new plate patterns in the design stage of new product development. However, this process is limited by issues such as complex and large CAD file handling, large geometry aspect ratios, approximation of features in fluid geometries and turbulence modeling. The current article discusses the choice of CFD parameters, such as mesh characteristics, turbulence models, boundary conditions etc on the accuracy of predictions. Examples where simple geometry changes resulted in significant improvement of performance are presented.

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Pages: 8 p.

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Details

  • Original title: Design of high efficiency compact brazed plate heat exchangers using CFD.
  • Record ID : 30002223
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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