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Lubi Rahadiyan,HyoMin Jeong,HanShik Chung 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This study presents characteristics of Eco-Friendly cascade vapor compression refrigeration system, where two non-ODP and low GWP refrigerants of Propane and Ethane were applied at high and low stage system. These refrigerants were charged into the system which is initially designed for R22 and R23 refrigeration system. By varying the amount of refrigerant charged into the low stage circuit by 0.0480~0.1039 g, temperature, pressure, and power consumption of the system was observed. The result shows that this Propane-Ethane couple can work satisfactorily with the lowest evaporating temperature achieved is down to -91,8℃. At 0.0480 g, evaporating temperature is-63℃, and at 0.0570 g mass, evaporating temperature is 91,8℃, however, as the mass increasing, evaporation temperature gradually increases, and the Coefficient of Performance decreases.
Lubi Rahadiyan,Yeong Geun Gim(김영근),You Sin Chon(전유신),Hyo Min Jeong(정효민),Han Shik Chung(정한식) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Experimental investigation of cascade vapor compression cycle performance has been carried out to study the optimal operational condition of two-stage cascade vapor compression cycle. For this purpose, R22 and R23 are utilized in high stage and low stage cycle respectively. The main variables investigated on this paper are pressure ratio of compressor, evaporation temperature, and compressor power, including electrical power consumption by two compressor, refrigerant capacity and performance coefficient of the system (COP). The test was conducted by varying water inlet temperature of cascade condenser from 10~34℃ and evaporation temperature at expansion valve outlet from 1~2.4 bar. The main results shows that, when evaporating temperature was increased, (COP) of system will also increases, meanwhile, when water inlet is 25℃, COP of the system shows the optimum performance.
Study of Ethane Performance at Two-Stage Cascade Vapor Compression System
Lubi Rahadiyan,Yeong-Geun Kim,Hyo-Min Jeong,Han-Shik Chung 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Due to global environment protection, to support demands for lower temperature, environmental friendly low-temperature refrigerants have to be studied and developed to replace halocarbon refrigerant. Generally, in the multiple stage of cascade vapor-compression system, halocarbon refrigerants are widely used, yet, some of them have been capped. Ethane, which is one of hydrocarbon compound, is an environmental friendly refrigerant because it has low GWP (~20 per 100 year) and ODP-free. This paper is dedicated to investigate performance of ethane in two-stage cascade refrigeration; this result is compared to those of R23, which has high GWP. To simulate two-stage cascade system, R22 was employed on high stage circuit. By varying evaporation temperature, it is found that performance of R 170 is better to those of R23.
Experimental study of Propane (R290) as an alternative refrigerant of R22
Lubi Rahadiyan,Yeong Geun Gim,You Sin Chon,Hyo Min Jeong,Han Shik Chung 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Experimental investigation of R290 (Propane) as substitute of R22 is being carried out. This study is aimed to investigate characteristics as well as performance of R22 experimental system apparatus by applying R290 (propane) and comparing the performance of R22 and R290 under the same experimental condition. For this purpose, an experimental single stage vapor compression cycle was utilized. The main variables investigated on this paper are temperature distribution, energetic performance such as compressor power, including electrical power consumption by two compressor, refrigerant capacity and performance coefficient of the system (COP). The result shows that Propane obtain the same temperature lift compare with R22. R22 has higher compressor outlet pressure but lower compressor outlet temperature compare to R290. Propane alsohas lower mass flowrate compare to R22. Additionally. Propane has higher heat transfer coefficient compare to R22, therefore, higher refrigeration capacity is expected. By measuring electrical power consumption, R290 compression power is lower than R22. Propane shows COP improvement by 3.6% relative to R22
Lubi Rahadiyan,HyoMin Jeong(정효민),HanShik Chung(정한식),김필환 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This study presents characteristics of Eco-Friendly cascade vapor compression refrigeration system, where two non-ODP and low GWP refrigerants of Propane and Ethane were applied at high and low stage system. These refrigerants were charged into the system which is initially designed for R22 and R23 refrigeration system. By varying the amount of refrigerant charged into the high-stage circuit by 0.1800~0.3470 ㎏, temperature, pressure, and power consumption of the system was observed. The most influenced temperature distribution by the variation of high stage refrigerant mass is temperature of cascade evaporator outlet (HS evaporator outlet) and compressor outlet temperature in the high stage circuit. Evaporation temperature in the low stage system decreases as the mass of refrigerant R290 in the high stage increases. Finally, compressor electric power consumption decreases as the mass of the refrigerant in the high stage increase.
Study on R290-R170 Cascade System by variation of High and Low Stage Refrigerant mass
Lubi Rahadiyan,Dibyendu Konar,HyoMin Jeong,HanShik Chung 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This study presents characteristics of Eco-Friendly cascade refrigeration system in which Propane (R290) and Ethane (R 170) were applied at high and low stage system respectively. These refrigerants were charged into the system which is initially designed for R22 and R23 refrigeration system. The result shows that this Propane-Ethane couple can work satisfactorily with the lowest evaporating temperature achieved is down to -91,8℃. By varying the amount of refrigerant charged into the low stage circuit by 0.0480~0.1039 g, at 0.0480 g, evaporating temperature is-63℃, and at 0.0570 g mass, evaporating temperature is 91,8℃, however, as the mass increasing, evaporation temperature gradually increases, and the Coefficient of Performance decreases. By varying the amount of refrigerant charged into the high-stage, circuit by 0.1800~0.3470 ㎏, Evaporation temperature in the low stage system decreases as the mass of refrigerant R290 in the high stage increases. Finally, compressor electric power consumption decreases as the mass of the refrigerant in the high stage increase
Experimental Optimization of Cascade Vapor Compression Refrigeration System
Lubi Rahadiyan,Yeong Geun Gim,You Sin Chon,Hyo Min Jeong,Han Shik Chung 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Experimental investigation of cascade vapor compression cycle performance has been carried out to study the optimal operational condition of two-stage cascade vapor compression cycle. For this purpose, R22 and R23 are utilized in high stage and low stage cycle respectively. The main variables investigated on this paper are pressure ratio of compressor, evaporation temperature, and compressor power, including electrical power consumption by two compressor, refrigerant capacity and performance coefficient of the system (COP). The test was conducted by varying water inlet temperature of cascade condenser from 10~34℃ and evaporation temperature at expansion valve outlet from 1~2.4 bar. The main results shows that, when evaporating temperature was increased, (COP) of system will also increases, meanwhile, when water inlet is 25℃, COP of the system shows the optimum performance
Performance of Hydrocarbon Refrigerants in Cascade Refrigeration System
Lubi Rahadiyan,You Sin Chon,Hyo Min Jeong,Han Shik Chung 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Natural refrigerants are the keys of the future demands on the eco-Friendly refrigerants. Among these refrigerants, hydrocarbons offer several advantages over the others Eco-Friendly refrigerants, due to its better thermophysical properties in the term of operating pressure, etc. This study tries to present the energetical performance of hydrocarbon refrigerants couples, e.g. R290/R170, R1270/R1150, based on analytical calculation of the operational condition in the cascade refrigeration system. The study also presents R22/R23 to represent current available non Eco-Friendly refrigerants. Variation of evaporating pressure and refrigeration capacity, -100~-70oC and 2~3kW respectively, are applied to investigate the characteristics of each refrigerants couples. The results shows that in every variation of evaporation temperature and refrigeration capacity, COP of R290/R170’s are higher than R1270/R1150 and R22/R23.