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고영환(Younghwan Ko),오세기(Saikee Oh),김병순(Byungsoon Kim) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
Along with international regulatory action to protect the global environment, the refrigeration and air conditioning industry has been challenged continuously to curb the use of fluoridated greenhouse gases. With the signing of 197 countries in the October 2016 Kigali Amendment, legal regulatory policies for F-gas reduction are accelerating. EU countries are introducing F-gas quota system to strengthen environmental regulations on HFCs, which have a significant impact on global warming. These regulations are affecting domestic refrigerators, heat pump dryers and airconditioners in which HCFC & HFC refrigerants were used. And It is directly weakens productive competitiveness in the international market. Currently, other advanced countries such as EU and USA are taking the lead in the global refrigerant regulations. They are stepping up new alternative refrigerants and some of them are already available in the market. We also have to understand these new directions about Global warming and refrigerant, and need to prepare before it is too late. Therefore, I would like to introduce recent trends of refrigerant regulation&polish in different countries.
김민수(Minsoo Kim),고영환(Younghwan Ko),오세기(Saikee Oh) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
This study aimed to compare the design change and option of driving part of R410A application model with R32 application model. The capacity of R32 is larger than that of R410A, but the load of R32 is also larger than that of R410A. So when we adopt R32 in R410A system, we should change the design or option of driving part to improve the efficiency. The window air-conditioners use continuos velocity compressor, so displacement of compressor should be changed to improve the efficiency of air-conditioner. And the models that use inverter compressor don’t have to change the design of compressor but should change the option of driving part such as hz of compressor or pulse of electronic expansion valve. The heat transfer coefficient and pressure drop of R32 are larger than those of R410A, but the mass flow rate of R32 system is lower than R410A system, so the effect is compensated. Also temperature glide of R410A is lower than 0.1oC, so it can be regard as pure refrigerant. Thus, there’s no big difference of heat exchanger.
MF 증발기 핀 형상에 따른 응축수 배수성능에 관한 연구
김현호(Hyunho Kim),류무성(Moosung Ryu),고영환(Younghwan Ko),장세동(Sedong Jang) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
에어컨 실내 열교환기의 배수성능은 신뢰성 품질에 있어서 매우 중요한 요소이다. 특히, 최근 사회적으로 위생에 대한 관심이 고조됨에 따라 에어컨 냄새 품질 향상에 대한 필요성이 대두되고 있으나, 스탠드 제품군에 사용되는 MF 증발기는 원형관 열교환기 대비 구조 및 공정상 한계로 인하여 배수성능이 떨어져서 냄새 발생에 취약하다. 이를 해결하기 위해 본 연구에서는 MF 증발기의 핀 현상에 따른 응축수 배수성능을 분석하였다.
ERTMS/ETCS의 TSI 절차에 관한 분석 (The analysis of TSI procedure in the ERTMS/ETCS)
이상혁(Lee Sanghyeok),김민석(Kim Minseok),정대영(Jung Daeyoung),고영환(Ko Younghwan),이종우(Lee Jongwoo) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
TSI(Technical Specification for Interoperability) is the highest technical specification in the Europe Railway and is composed by assessment items and essential requirements included by safety, reliability, availability, health, environment protection and technical compatibility. It is used on the research and development in the next generation railway technical. Currently, TSI procedures have been asked to bid for high speed rail business in Europe and Brazil. Also, all the railway systems such as infrastructure, signaling, electric and rolling stock system corresponding with standard of TSI procedures are exported and imported. Recently, Safety Critical System which has been studied on future railway R&D business in Korea is the state of the art train control system. And it is needed for system assessment of TSI procedures before system test and operation. In this paper, basic research is performed for analyzing TSI procedures suitable for the state of the art train control system in Korean railway.