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김영근(Yeong Geun Kim),루비라하디얀(Lubi Rahadiyan),정효민(Hyo Min Jeong),정한식(Han Shik Chung),김무근(Moo Geun Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
This paper presents the development and testing of cascade refrigerator system for achieving super-low temperature condition. This experiment study shows the pressure and evaporation condition in the second stage to the temperature characteristics of the cascade refrigeration system. Compressor inlet pressure of low-pressure stage was worked in the vacuum condition and over-atmospheric pressure. Evaporation condition was tested in the vacuum condition and atmospheric pressure. Two different types of refrigerants are utilized for this system, R-22 is applied for the high stage, and R-170 for the low-pressure stage.
Yeong-Geun Kim(김영근),Lubi Rahadiyan(루비라하디얀),Hyo-Min Jeong(정효민),Han-Shik Chung(정한식) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
This paper presents the experimental study on temperature distribution of two-stage cascade vapor-compression system for achieving super-low temperature. Two-stage cascade vapour compression cycle is a method to achieve super low temperature under -80℃. This system requires two different types of refrigerant at higher and lower stages. However, by the Montreal protocol, several refrigerants for the low-stage system as well as high stages have been banned due to its threat to ozone layer. Alternatives retrofit refrigerant for replacing CFC and HCFC lies from HFC to natural refrigerant. In this study, azeotropic zero-ODP refrigerant, R508B blend of two HFC refrigerant R23/R116 (46.0/54.0) was utilized in the low stage cycle, this refrigerant has advantages based on normal boiling point compare to its compositing element. On this experiment, cooling chamber was filled with ethyl alcohol 0, 10, 20, and 25 liter respectively as refrigerant load. By changing the volume of cooling chamber fluid, temperature distribution of the system was observed. More ethyl alcohol mass in the cooling chamber, longer steady state condition achieved. It is also found that the change of ethyl alcohol in the cooling chamber gives little effect on the final temperature distribution.
1원측 냉매량 변화에 따른 캐스캐이드 냉동 시스템의 온도특성
김필환(Pil-Hwan Kim),김영근(Yeong-Geun Kim),루비라하디얀(Lubi Rahadiyan),정한식(Han-Shik Chung),정효민(Hyo-Min Jeong) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Super low temperature has many applications nowadays, from the chemical processing, automotives manufacturing, plastic recycling, etc. Considering of its wide application in the present and the future, study of the super-low temperature refrigeration system should be actively carried out. Super low state temperature can be achieved by using multi-stage refrigeration system. This paper present the development and testing of cascade refrigerator system for achieving super-low temperature. On this experiment, two different types of HCFCs refrigerants are utilized, R-22 and R-23 or R-290 and R-170 were applied for the high stage and the low-pressure stage respectively. The lowest temperature in the low-pressure evaporator that can be achieved by th is cascade refrigeration system is down to -85℃. This experiment is aimed to study the effect of high stage refrigerant mass to the overall temperature characteristics of cascade refrigeration system.