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전상신(Sang Sin Jeon),권일욱(Il Wook Kwon),하옥남(Ok Nam Ha) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Nowadays CFCs and HCFCs refrigerants are restricted because it cause depletion of ozone layer. Accordingly, this experiment apply the NH₃ gas and not CFCs and HCFCs for refrigerant to study the performance characteristic from the superheat control and improve the energy efficiency from the high performance. The condensing pressure of refrigeration system is increased from 14.5bar to 16bar by 0.5bar and superheat temperature is increased from 0℃ to 10℃ by 1℃ at each condensing pressure. As the result of experiment, when the superheat temperature is 1℃ at each condensing pressure, the refrigeration system has the high performance.
고밀도 열교환기를 이용한 NH₃냉동장치의 성능 특성 연구
이승재(Seung-Jae Lee),전상신(Sang-Sin Jeon),권일욱(Il-Wook Kwon),이종인(Jong-In Lee),하옥남(Ok-Nam Ha) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Nowadays CFCs and HCFCs refrigerants are restricted because it cause depletion of ozone layer. Accordingly, this experiment apply the ammonia gas and not CFCs and HCFCs for refrigerant to study the performance characteristic from the superheat control and improve the energy efficiency from the high performance. The condensing pressure of refrigeration system is increased from 15.0bar to 16bar by 0.5bar and superheat temperature is increased from 0℃ to 10℃ by 1℃ at each condensing pressure. As the result of experiment, when the superheat temperature is 0℃ at each condensing pressure, the refrigeration system has the high performance.
[열유체부문] HFC-152a와 HFC-152a에 CF₃I를 혼합한 공비혼합냉매의 특성
이종인(Jong-In Lee),하옥남(Ok-Nam Ha),홍경한(Kyoung-Han Hong),최운수(Woon-Soo Choi),권일욱(Il-Wook Kwon),박찬수(Chan-Soo Park) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
These days, an attention of environment has been increasing allover the world. To prevent green house effect and destruction of an ozone layer, an ozone destruction potential(ODP) must be zero and a refrigerant for low global warming potential(GWP) is needed. HFC-134a. in which hydrogen is mixed instead of chlorine is a refrigerant used for automobile conditioners and its destruction potential is ecologically zero. However, it is not considered as a perfect substitutive refrigerant as its GWP is high. It is studied refrigerant mixtures in which HFC-152a, HFC-152a and CF31 with low GWP and zero ODP are mixed by experimentally and concluded as follows: 1) With the variation of speed of compressor outside temperature and flow rate, the heat of evaporator and compressor and coefficient of performance was varied. and influenced the air conditioner. 2) The pressure of evaporator was decreased with increasing the speed of compressor and the pressure of evaporator with the refrigerant HFC-152a was higher 24% than that of azotrope refrigerant. mixed with CF31<br/> <br/>