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An Experimental Study on the Freezing Protection Valve Using Phase Change Material(PCM) for the Heat Exchanger

상변화물질(PCM)을 이용한 열교환기용 동파방지밸브에 관한 실험적 연구

  • Received : 2012.11.19
  • Accepted : 2012.12.21
  • Published : 2012.12.30

Abstract

This paper is an experimental study on the freezing protection valve used for solar water heating, air-conditioning systems, and plumbing systems. When the phase change occurs from liquid to solid, most of the substances except water volumetrically shrink. And referred to as PCM(Phase Change Material) a substance with such properties, the phase change temperature varies depending on the material. To prevent the freezing of the plumbing system, such as air-conditioning system in the winter season, we developed a several types of freezing protection valve using PCM whose freezing temperature are $2-4^{\circ}C$. The working principle of the freezing protection valve is that the fluid inside the pipe is released to prevent the system-collapse when fluid temperature reaches the freezing temperature of the PCM. And then the valve is closed and returned to the original position automatically when the temperature of the operating fluid rises. In this paper, the operating temperatures, discharge flow rate and the response characteristics of the valve during the operation are tested and investigated. From the results of this research the freezing protection valves employing PCM are expected to be commercialized in the near future.

Keywords

Freezing protection valve;PCM:Phase Change Material;Liquid phase;Solid phase;Heat exchanger

References

  1. Air & Coil사(미국) 제품 카다로그
  2. Thermo-Omega-Tech사(미국)제품 카 다로그
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  4. 사업화연계 기술개발사업 "상변화 물질을 이용한 동파방지밸브 사업화 기술 개발" 연구의 최종보고서, 지식경제부, 2012. 5.
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Cited by

  1. The Novel Design to Prevent a Water Meter Damage from Freezing Using Bellows Tube vol.19, pp.7, 2018, https://doi.org/10.1007/s12541-018-0121-0