CFC대체냉매 개발을 위한 HFC계 냉매 + HC계 냉매 혼합물의 기-액 상평형 연구 : A Study of vapor-liquid equilibrium of HFC + HC systems for developing alternative refrigerants of CFCs
- 발행기관 서강대학교 대학원
- 지도교수 임종성
- 발행년도 2007
- 학위수여년월 200702
- 학위명 석사
- 학과 및 전공 화학공학
- 식별자(기타) 000000103556
- 본문언어 한국어
초록/요약
The stratospheric ozone layer is a protective shield that absorbs most of the ultraviolet radiation that could harm living organisms on earth. Stratospheric ozone is constantly being created and destroyed by natural photochemical processes that are in dynamic equilibrium. This equilibrium has been disrupted by the release of anthropogenic chemicals--especially chlorine and bromine compounds such as chlorofluorocarbons (CFCs), halons, and a broad range of industrial chemicals used as refrigerants, foaming agents, aerosol propellants, fire retardants, solvents, and fumigants. As a result of these chemical processes, the ozone layer is being depleted. In the present study, it is known a blend of hydrocarbon and noflammable HFC refrigerant are reduced both in global warming impact and flammability. Therefore the VLE data for the binary mixture of Propane/HFC-227ea, HFC-152a/Butane, HFC-227ea/Butane, HFC-134a/Butane were measured by using circulation type experimental apparatus at 273.15K, 283.15K, 293.15K, 303.15K, 313.15K and 323.15K. Vapor-liquid equilibrium data are essential when using mixtures as a refrigerant. The experimental result was correlated with CSD and the Peng-Robinson equation of state. The calculated values from equation of state have shown satisfactory results in comparison with the experimental data. Azeotropic compositions were found in all these mixtures.
more초록/요약
ABSTRACT A Study of vapor-liquid equilibrium of CFC + HC systems for developing alternative refrigerants of CFCs Hee-Kook Roh Department of Chemical and Biomolecular Engineering, Sogang University The stratospheric ozone layer is a protective shield that absorbs most of the ultraviolet radiation that could harm living organisms on earth. Stratospheric ozone is constantly being created and destroyed by natural photochemical processes that are in dynamic equilibrium. This equilibrium has been disrupted by the release of anthropogenic chemicals--especially chlorine and bromine compounds such as chlorofluorocarbons (CFCs), halons, and a broad range of industrial chemicals used as refrigerants, foaming agents, aerosol propellants, fire retardants, solvents, and fumigants. As a result of these chemical processes, the ozone layer is being depleted. In the present study, it is known a blend of hydrocarbon and noflammable HFC refrigerant are reduced both in global warming impact and flammability. Therefore the VLE data for the binary mixture of Propane/HFC-227ea, HFC-152a/Butane, HFC-227ea/Butane, HFC-134a/Butane were measured by using circulation type experimental apparatus at 273.15K, 283.15K, 293.15K, 303.15K, 313.15K and 323.15K. Vapor-liquid equilibrium data are essential when using mixtures as a refrigerant. The experimental result was correlated with CSD and the Peng-Robinson equation of state. The calculated values from equation of state have shown satisfactory results in comparison with the experimental data. Azeotropic compositions were found in all these mixtures. Key words : Vapor liquid equilibria, CSD, VLE, propane, butane, refrigerant, Azeotropic, HFC-152a, HFC-134a, HFC-227ea, Peng-Robinson equation of state
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