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Optimization of a shell-and-tube heat exchanger based on ice slurry.

Number: 0025

Author(s) : HANI R., PONCET S., MONNEY D.

Summary

In this study, one develops a simple analytical model to quantify the performance of shell and tube heat exchangers working with ice slurries. The Matlab code is based on the ɛ NTU method to determine the heat transfer rates. To better capture the pressure drop distribution, the emphasis is put on the modeling of the rheological behavior of the slurries. Rheograms have been then first obtained by a hybrid rheometer for ethylene glycol based ice slurries over a wide range of ice fraction (5 65%). The model is then favorably compared in terms of pressure drop and overall heat transfer coefficient with the experimental data of Renaud Boivin et al. (2012). It besides improves the former predictions of these authors using a simpler analytical model. The model is extended to perform a parametric analysis of the hydrodynamic behavior and heat transfer in a second shell and tube heat exchanger by varying the ice fraction (up to 25%) and the ice slurry Reynolds number (up to 2×104). While the heat exchanger effectiveness increases by increasing the ice fraction, the efficiency index gathering the Nusselt number and pressure drop referring to the base case without ice remains always below 1. There is then no benefit from using ice slurry compared to pure water. The same heat exchanger is finally optimized using the fmincon algorithm. The optimal geometry enables to improve the efficiency index by 17.7% and the heat exchanger effectiveness by 11.5%.

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Pages: 8 p.

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Details

  • Original title: Optimization of a shell-and-tube heat exchanger based on ice slurry.
  • Record ID : 30032378
  • Languages: English
  • Subject: Technology
  • Source: 14th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings:  Paris France, May 29-31, 2024.
  • Publication date: 2024/05/31
  • DOI: http://dx.doi.org/10.18462/iir.pcm.2024.0025

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