Development of Antifreeze Concentration Control device for Solar Heat Energy System

태양열에너지 시스템용 부동액 농도 제어 장치의 개발

  • Seo, Choong-Kil (Division Department of Automotive & Mechanical Engineering, Howon University) ;
  • Won, Joung Wun (Division Department of Automotive & Mechanical Engineering, Howon University)
  • 서충길 (호원대학교 자동차기계공학과) ;
  • 원종운 (호원대학교 자동차기계공학과)
  • Received : 2018.01.25
  • Accepted : 2018.04.06
  • Published : 2018.04.30


The gases emitted from internal combustion engines using fossil fuels are causing many social problems, such as environmental pollution, global warming, and adverse health effects on the human body. In recent years, the demand for renewable energy has increased, and government policy support and research and development are also active. In the collecting part of a solar energy system, which is widely used at home, propylene glycol (PG) (anti-freeze), as a heating medium, is mixed with water at a fixed value of 50%, and the heat is transferred to the collecting part at subzero temperatures. On the other hand, when leakage occurs in the heat medium in the heat collecting part, supplemental water is supplied to the solar heat collecting part due to the characteristics of the solar heat system, so that the concentration of antifreeze in the replenishing water becomes low. As a result, the temperature of the solar heat collecting part is lowered resulting in a frost wave, which causes economic damage. The purpose of this study was to develop a device capable of controlling the antifreeze concentration automatically in response to a temperature drop to prevent freezing of the heat collecting part generated in the solar energy system. The electrical conductivity of the H2O component was larger than that of PG, and the resistance increased with decreasing temperature. The PG concentration control values of 40, 50, and 60% should be controlled through calibration with a PG concentration of 39.6, 50.7, and 60.1%.


Antifreeze;Energy;Geothermal;Solar heat;Propylene Glycol


Supported by : 중소기업청


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