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Low GWP 혼합 냉매의 열역학 물성치를 위한 상태방정식의 선정
이공훈,김동호,김우경,김진섭,김영,류진우 대한기계학회 2022 大韓機械學會論文集B Vol.46 No.10
Low GWP refrigerants are required to manufacture the refrigeration systems owing to the worldwide global warming issue. The refrigerant replacements for most refrigeration systems have been developed with a GWP value of less than 150. However, the replacement for R410A with a GWP value of less than 150 has not been developed to date. Thus, an attempt has been made to develop the refrigerant replacement as a mixture refrigerant. To develop this refrigerant, the thermodynamic properties must be calculated with the equation of state (EOS) to investigate its performance. In the present study, several types of EOS have been investigated to calculate the thermodynamic properties for pure fluids and mixtures, and the Helmholtz energy explicit EOS showed the best results.
차세대 냉매의 국내 적용을 위한 안전규격(표준) 및 국내·외 냉동 공조산업 동향의 분석
박귀중,박성호,이중건,박상진 대한기계학회 2022 大韓機械學會論文集B Vol.46 No.11
Korea is the world’s fifth largest producer and accounts for 2.5 of the global air conditioner market share (about KRW 10.2 trillion), but HCFC and HFC refrigerants account for more than 95 of the total refrigerant volume. Small and medium-sized enterprises in Korea lack the technology and experience to switch to eco-friendly alternative refrigerants. They are concerned about their export competitiveness because they are deprived of export opportunities to advanced countries owing to a lack of products. Examples of these are the European F-gas regulations and quotas systems and new refrigerant global warming potential (GWP) limits in California, USA. However, in the domestic market, R-22 refrigerant, which is a refrigerant with the ozone depletion potential (ODP), is still applied, and HFC-410A and HFC-134a, which are refrigerants with high GWP, are mainly applied. From 2017 to 2019, the refrigerant recovery ratio was within 1 of the domestic average annual refrigerant production. To use hydrogen fluorides (HFCs) that are designated as global warming substances in the Kigali Amendment Protocol in 2016, each country is gradually abolishing worldwide refrigerant regulations. Accordingly, domestic and foreign safety standards, refrigerant regulations, and industry trends are reviewed, and problems of the domestic industry and future countermeasures are presented.