Experimental Investigation of Cooling Coefficient of Performance and Cooling Capacity in a Refrigerant System with Carbon Dioxide

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  • Igarashi Makoto
    Department of Biochemistry and Engineering, School of Engineering, Tohoku University
  • Tamaki Shogo
    Department of Chemical Engineering, Graduate School of Engineering, Tohoku University
  • Fujii Yuuko
    Department of Chemical Engineering, Graduate School of Engineering, Tohoku University
  • Matsushita Yohsuke
    Department of Chemical Engineering, Graduate School of Engineering, Tohoku University
  • Aoki Hideyuki
    Department of Chemical Engineering, Graduate School of Engineering, Tohoku University
  • Miura Takatoshi
    Department of Chemical Engineering, Graduate School of Engineering, Tohoku University
  • Take Koichiro
    Showa Denko Co.
  • Hamano Hidemitsu
    Showa Denko Co.

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Other Title
  • ＣＯ２冷凍サイクルを対象とした冷房成績係数および蒸発器の交換熱量に関する実験的検討
  • CO2 レイトウ サイクル オ タイショウ ト シタ レイボウ セイセキ ケイスウ オヨビ ジョウハツキ ノ コウカン ネツリョウ ニ カンスル ジッケンテキ ケントウ

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Abstract

The performance of a refrigeration cycle with carbon dioxide was experimentally investigated. The effects of mass flow rate of carbon dioxide, higher side pressure and refrigerant mass on the cooling coefficient of performance, cooling capacity and compressor work were examined. Then cooling coefficient of performance decreased and cooling capacity increased with an increase in mass flow rate of carbon dioxide. The cooling coefficient of performance had maximum value at a gas cooler outlet pressure of around 8.3 MPa regardless of compressor speed. A higher cooling coefficient of performance will be obtained by controlling gas cooler outlet pressure. Furthermore, compressor work increased with an increase in gas cooler outlet pressure regardless of refrigerant mass. The cooling coefficient of performance and cooling capacity increased with an increase in refrigerant mass.

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