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Prediction of fin efficiency, air side heat transfer coefficient, and air side pressure drop of flat tube heat exchanger.

Number: 2542

Author(s) : YATSUYANAGI A., ISHIBASHI A., NAKAMURA S.

Summary

Heat exchangers equipped with circular tubes are generally used in air conditioners. Recently, air conditioners using heat exchangers equipped with flat tubes for higher performance have been enlarging. It is also effective for increasing the efficiency of the air conditioner to improve the performance by optimal design of the heat exchanger. Therefore, it is important to improve the accuracy of the air side performance prediction method. In this study, we propose a new method to predict air side heat transfer characteristics and air side pressure drop characteristics of the flat tube heat exchanger using the numerical analysis.
The calculation results, using a new fin efficiency equation with corrections in the row pitch direction and the column pitch direction, agree well with the numerical analysis results taking into account the air side local heat transfer coefficient. In addition, the calculation results, using non-dimensional equations for the air side heat transfer coefficient and the air side pressure drop under dry conditions in conventional form, and a new fin efficiency equation, agree well with the numerical analysis results and the measurement results. Furthermore, in wet conditions, it is suggested that the existence of the slit has a significant effect on the water film thickness around the pipe back-calculated from the measurement results and the non-dimensional equation.

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Pages: 9

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Details

  • Original title: Prediction of fin efficiency, air side heat transfer coefficient, and air side pressure drop of flat tube heat exchanger.
  • Record ID : 30028547
  • Languages: English
  • Source: 2021 Purdue Conferences. 18th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2021/05
  • Document available for consultation in the library of the IIR headquarters only.

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