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R-134a와 R-152a 냉매를 이용한 자동차용 에어컨 시스템의 성능에 관한 실험적 연구
김종수(Jeong-Su Kim),이대웅(Dae-Woong Lee),유성연(Seong-Yeon Yoo) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
Recently, as the climate of temperature change has happened worldwide. To solve this problem, Kyoto protocol was taken to regulate global warming on Feb. 2005 and each country is making efforts to prevent global warming. In the automotive industry, R-134a refrigerant is widely used most these days because it has zero ODP(Ozone Depletion Potential). But R-134a GWP(Global Warming Potential) is so high. Therefore, replacement refrigerant desperately is needed as a alternative refrigerant. So, R-152a is considered as one of the alternative refrigerants due to zero ODP and lower GWP against as required on Europe Committee. In this paper, performance of the air conditioning system between R-134a and R-152a is investigated experimentally. In the bench level, cooling capacity, condensing capacity, COP of automotive air conditioning system are evaluated by means of air velocity entering the condenser and compressor revolution speed with optimized charge refrigerant quantity. Result of this study, R-152a refrigerant shows the possibility as alternative refrigerant of current R-134a in automotive air conditioning system.
R-134a와 R-152a 냉매를 이용한 자동차용 에어컨 시스템의 성능에 관한 실험적 연구
김종수(Jeong-Su Kim),이대웅(Dae-Woong Lee),유성연(Seong-Yeon Yoo) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.4
Recently, as the climate of temperature change has happened worldwide. To solve this problem, Kyoto protocol was taken to regulate global warming on Feb. 2005 and each country is making efforts to prevent global warming. In the automotive industry, R-134a refrigerant is widely used most these days because it has zero ODP(Ozone Depletion Potential). But R-134a GWP(Global Warming Potential) is so high. Therefore, replacement refrigerant desperately is needed as a alternative refrigerant. So, R-152a is considered as one of the alternative refrigerants due to zero ODP and lower GWP against as required on Europe Committee. In this paper, performance of the air conditioning system between R-134a and R-152a is investigated experimentally. In the bench level, cooling capacity, condensing capacity, COP of automotive air conditioning system are evaluated by means of air velocity entering the condenser and compressor revolution speed with optimized charge refrigerant quantity. Result of this study, R-152a refrigerant shows the possibility as alternative refrigerant of current R-134a in automotive air conditioning system.
태양열 집열기용 히트파이프 작동유체의 충진량 변화에 따른 열특성의 실험적 연구
정경택(K.T. Chung),배찬효(C.H. Bae),김병기(B.G. Kim),서정세(J.S. Suh) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This experiment is performed to investigate the optimal charging quantity of working fluid of heat pipe with grooved wick in solar collector. The shape of groove is rectangle. The heat pipe used in solar collector is longer than any other heat pipe. So, the charging quantity of working fluid is very important factor to improve the performance. Working fluid of heat pipe is charged 9 ㏄ and 15 ㏄, respectively. these heat pipe are tested a㏄ording to various heat input, inclination angle and coolant temperature. At a result, With various charging quantity, We could estimate the influence of working fluid of heat pipe in solar collector and also find out the optimal charging quantity of working fluid.
차량용 에어컨 증발기의 결빙에 주변 환경이 미치는 영향에 대한 실험적 연구
이대웅(Dae Woong Lee) 대한설비공학회 2019 설비공학 논문집 Vol.31 No.10
For successful design of an automobile air-conditioning system, the evaporator is the main component and ensuring the integrity of the freezing process is critical in maintaining reliable performance. In this study, the changes in environment, a lack of refrigerant charge amount with time when the vehicle is released, the changes in outdoor temperature, and the evaporator freezing with change of the air handler unit (AHU) airflow, are examined. Also, this study conducted the surface temperature of the evaporator and the effect of environmental factors on the freezing mechanism, according to the refrigerant flow pattern inside the evaporator. If the refrigerant flow which flows inside the evaporator would not be stable, causing the deviation of surface temperature of the evaporator, the refrigerant charge amount is reduced by 50%. As a result, the evaporator is likely to be froze due to temperature difference of actual an subzero point and measured value of the temperature sensor. The lower the outdoor temperature in the evaporator, the easier for evaporator to freeze due to the small cooling load. This paper’s analysis on the evaporator freezing mechanism of a variety of condition of air-conditioning systems and condition of usage will be valuable in creating robust designs relative to the prevention of evaporator freezing.
R134a와 R152a 냉매를 이용한 자동차용 에어컨 시스템의 성능 비교
김종수(Jeong-Su Kim),남수병(Su-Byung Nam),이대웅(Dae-Woong Lee),유성연(Seong-Yeon Yoo),김진혁(Jin-Hyuck Kim) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
This study presented the feasibility of R152a refrigerant as an alternative of R134a which is used in the current automobile air conditioning system. The performance of air conditioning system installed in the actual vehicle was tested using the climate wind tunnel. The experiments were conducted at various refrigerant charge quantities and various driving conditions such as city traffic, highway traffic and parking. Same components and lubricant were used for both R134a and R152a system. The effects of air set values of thermal expansion valve on the performance were also investigated. In case of the R152a system, refrigerant charge quantity can be reduced about 20%, better performance and superior compressor durability is expected due to the lower discharge pressure compared to the R134a system.