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Investigation of different heat transfer correlations on evaporation within fuel cell cooling channels.

Number: 2158

Author(s) : KOSCHEL P., SCHONHEIT M., RADDATZ M., XU Y., THOMAS C.

Summary

Fuel cell systems play a crucial role in the development of new energy systems, striving to meet economic and ecological requirements for a secure and environmentally friendly energy supply. Particularly in mobile applications like automotive or aviation sectors, fuel cell systems, are gaining prominence due to their emission-free and efficient operation. In previous studies, it has been demonstrated that two-phase cooling systems offer advantages over liquid cooling systems, which represents the current state of the art technology. This study investigates the impacts of various heat transfer correlations on evaporation within the cooling channel of a two-phase cooling system, particularly in the context of fuel cell-powered aircraft applications utilizing methanol as a refrigerant. The investigation is conducted under cruise phase conditions, considering an electrical power of the stack of 100 kW and a mean fuel cell membrane temperature of 90 °C. The results reveal significant variations in heat transfer coefficients along the cooling channel, ranging from 500 to 6000 W/m²·K, with evaporation temperatures between 79 and 88 °C. Higher average heat transfer coefficients lead to increased evaporation temperatures. Furthermore, employing the Kim&Mudawar correlation results in more than a 13% lower mass flow rate compared to the Lazareck&Black correlation. This study contributes to understanding the influence of the evaporation heat transfer coefficient within the fuel cell cooling channel at the system level, providing valuable insights into the optimization of two-phase cooling systems for fuel cell-powered aircraft. Further research is necessary to experimentally determine the heat transfer coefficient, thereby validating the findings presented in this paper.

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  • Original title: Investigation of different heat transfer correlations on evaporation within fuel cell cooling channels.
  • Record ID : 30032995
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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