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Waste heat driven absorption/vapour compression cascade refrigeration system for megawatt scale, high-flux, low temperature cooling.

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

Summary

A novel cascaded absorption/vapor-compression cycle with a high temperature lift for a naval ship application was conceptualized and analyzed. A single-effect LiBr-H2O absorption cycle and a subcritical CO2 vapour-compression cycle were coupled together to provide low temperature refrigerant (-40°C) for high heat flux electronics applications, medium temperature refrigerant (5°C) for space conditioning and other low heat flux applications, and as an auxiliary benefit, provide medium temperature heat rejection (~48°C) for water heating applications. A thermodynamic model was developed to analyze the performance of the cascaded system, and parametric analyses were conducted to estimate the performance of the system over a range of operating conditions. The performance of the cascaded system was also compared with an equivalent two-stage vapor-compression cycle. This cycle was found to exhibit very high COPs over a wide range of operating conditions and when compared to an equivalent vapour-compression system, was found to avoid up to 31% electricity demand.

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Pages: 977-989

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Details

  • Original title: Waste heat driven absorption/vapour compression cascade refrigeration system for megawatt scale, high-flux, low temperature cooling.
  • Record ID : 30001302
  • Languages: English
  • Source: Sources/sinks Alternative to the Outside Air for Heat Pump and Air-conditioning Techniques (Alternative Sources - AS), Padua, Italy, April 5-7, 2011. / International Sorption Heat Pump Conference (ISHPC11), Padua, Italy, April 6-8, 2011.
  • Publication date: 2011/04/06

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