수평관내 이산화탄소의 냉각열전달과 압력강하 특성에 관한 연구

Heat transfer and pressure drop characteristics during cooling process of supercritical $CO_2$ in a horizontal tube

  • 손창효 (부경대학교 냉동공조공학과) ;
  • 김종열 (동명대학교 가스냉동공학과) ;
  • 노건상 (동명대학교 가스냉동공학과) ;
  • 구학근 (동명대학교 가스냉동공학과) ;
  • 박기원 (여수대학교 냉동공학과) ;
  • 오후규 (부경대학교 냉동공조공학과)
  • 발행 : 2005.11.01

초록

This paper presents the heat transfer and pressure drop characteristics during cooling process of carbon dioxide in a horizontal tube. The test section is a tube in tube type heat exchanger with refrigerant flowing in the inner tube and water flowing in the annulus. It was made of a stainless steel tube with the inner diameter of 7.75 [mm], the outer 2 diameter of 9.53 [mm] and length of 6000 [mm]. The refrigerant mass fluxes were $200{\sim}400$ [kg/$m^2s$] and the average pressure varied from 7.5 [MPa] to 10.0 [MPa]. The main results were summarized as follows The heat transfer coefficient of supercritical $CO_2$ increases in decrease of the gas cooler pressure. And the heat transfer coefficient increases with respect to the increase of the refrigerant mass flux. Among some correlations proposed in a transcritical region, Bringer-Smith's correlation has some analogy with experimental results. The pressure drop decreases in increase of the gas cooler pressure and increases with respect to increase the refrigerant mass flux.

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