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IIR document

Design of a cryogenic helium plate-fin heat exchanger.

Number: pap. n. 027

Author(s) : HU Z. J., QIU Y. N., ZHANG N., et al.

Summary

A cryogenic helium plate-fin heat exchanger had been designed and tested operating at 20 K and 0.8 MPa. The characteristic parameters of the serrated fins were optimized in order to increase heat transfer performance. The channels’ distribution and array were the key design issues for plate-fin heat exchangers. According to the heat transfer coefficient and the flow fluids resistance to calculated the fluids mass velocity, the channel amount and the efficient breadth of the heat exchanger. The heat transfer design included to calculate heat transfer coefficient, the fins’ efficiency and the total heat transfer area. After the efficient length of the heat exchanger had been determined, the pressure loss and temperature distribution of the fluids flowed in different channels were calculated. Because this heater exchanger was used in a 20 K helium turbine refrigeration cryogenic system, the leak rate was the most important parameter to avoid the impurity polluted the helium working gas. The leak rate of the plate-fin heat exchangers depended on the manufacturing techniques. Aluminum plate-fin heat exchangers require high level of technology, strict quality control and inspection measures. Manufacturing process included parts preparation, plate-beam assembly, brazing, and head arc welding processes. The temperature difference between the warm and cold fluids on the hot end of the cryogenic heat exchanger was tested, which relative error between the experimental value and the designed value was less than 2.5%.

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Pages: 413-416

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Details

  • Original title: Design of a cryogenic helium plate-fin heat exchanger.
  • Record ID : 30006974
  • Languages: English
  • Source: Cryogenics 2012. Proceedings of the 12th IIR International Conference: Dresden, Germany, September 11-14, 2012.
  • Publication date: 2012/09/11

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