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High-flux thermal management at megawatt scale using a double-effect absorption/vapor-compression cascade refrigeration cycle.

Author(s) : NAGAVARAPU A. K., GARIMELLA S.

Type of article: IJR article

Summary

A robust, high-performance, cascaded double-effect absorption/vapor-compression cycle with a high temperature lift was conceptualized and analyzed for a naval ship application. A double-effect LiBr–H2O absorption cycle driven by high-temperature (>275°C) exhaust heat was coupled to a subcritical CO2 vapor-compression cycle to provide low temperature refrigerant (-40°C) for high-heat flux electronics applications and medium temperature refrigerant (5°C) for space conditioning and other low-heat flux applications. The double-effect absorption/vapor-compression cycle outperformed the corresponding single-effect cycle, providing 74.4% higher cooling capacity for the same waste heat input; however, it required more heat exchange area. The improved performance of the double-effect configuration was much higher at lower heat rejection temperatures. A parametric study on the exhaust and heat rejection temperatures showed that the cycle exhibited high COPs over a wide range of operating conditions, indicating the robustness of the cycle.

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Pages: 257-267

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Details

  • Original title: High-flux thermal management at megawatt scale using a double-effect absorption/vapor-compression cascade refrigeration cycle.
  • Record ID : 30027799
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 119
  • Publication date: 2020/11
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2020.08.005

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