http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
권일욱,하옥남 대한설비공학회 2004 설비공학 논문집 Vol.16 No.8
Since the use of CFC and HCFC refrigerants are to be restricted due to the depletion of ozone layer, this experiment applies the NH3 gas to study the performance characteristics from the superheat control for improving the energy efficiency. The experiments are carried out for the condensing pressure of refrigeration system from 14.5 bar to 16.0 bar by 0.5 bar and for superheat temperature from 0℃ to 10℃ by 1℃ at each condensing pressure. As a result of experiment, when the superheat temperature is 1℃ at each condensing pressure, the refrigeration system has the highest performance.
HFC-134a와 대체냉매 HFC-152a에 CF_3I를 혼합한 자동차냉매 특성
권일욱,박찬수,홍경한,문기선,최운수,서의경,윤갑식,이종인,하옥남 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.1
These days, an attention of environment has been increasing all over the world. to prevent the green house effect and destruction of an ozone layer, an ozone destruction potential(ODP) 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-134a, HFC-152a and CF_3I 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 that of the refrigerant HFC-134a was higher 21% than that of azotrope refrigerant mixed with CF_3I. The overall capacity of condensor and evaporator was increased and HGC-134a was higher than azotrope refrigerant mixed with CF_3I 3. The capacity of evaporator with the refrigerant HFC-134a was higher 6% than azotrope refrigerant mixed with CF31 and the required power with zaotrope refrigerant mixed with CF_3I was higher 11% than that of HFC-134a. 4. The COP of the refrigerant FHC-134a was higher 31% in 1000RPM. when outside temperature was increased, COP was decreased. 5. Performance of HFC-134a is better than azotrope refrigerant mixed with CF_3I but prefered zaotrope refrigerant mixed with CF_3I considering the environment.
NH3 냉동장치의 과열도 변화에 의한 성능 특성 연구 II
하옥남,권일욱,전상신,이승재,정송태,하경수,윤갑식,이종인,홍경한 대한설비공학회 2005 설비공학 논문집 Vol.17 No.4
Since the use of CFC and HCFC refrigerants are to be restricted due to the depletion of ozone layer, this experiment applies the NH3 gas to study the performance characteristics of NH3 refrigeration system by the superheat control for improving the energy efficiency. The experiments are carried out for the condensing pressure of refrigeration system from 1,500 kPa to 1,600 kPa and for degree of superheat from 0℃ to 10℃ at each condensing pressure. As a result of experiment, when the degree of superheat is 0℃ at each condensing pressure, the refrigeration system has the highest performance.
이종인,권일욱,박찬수,하옥남 朝鮮大學校 機械技術硏究所 2003 機械技術硏究 Vol.6 No.1
These days, an attention of environment has been increasing all over the world. To prevent the green house effect and destruction of an ozone layer, an ozone destruction potential(ODP) 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-134a, HFX-152a and CF₃I with low GWP and zero ODP are mixed by experimentally and concluded as follows : 1) With the variation of speed of compressor, outdoor air temperature effects the performance of air-conditioner, and the performance characteristics differ from according to the refrigerant. 2) Evaporator capacity is constant, condenser capacity is 6% more HFC-134a than mixed refrigerant. 3) The required power is higher than other mixed refrigerant of HFC-152a.
Ha, Ok-Nam,Kwon, Il-Wook,Hong, Suck-Ju,Kim, Jae-Yeol,Lee, Jong-In,Jeon, Sang-Sin,Ha, Kyung-Soo,Lee, Seung-Jae,Park, Chan-Soo,Jeong, Song-Tae 한국공작기계학회 2005 한국생산제조학회지 Vol.14 No.2
Since the use of CFC and HCFC refrigerants is to be restricted due to the depletion of ozone layer, this experiment applies the NH3 gas to study the performance characteristics from the superheat control for improving the energy efficiency. The experiments are carried out for the condensing pressure of refrigeration system from 1500kPa to 1600kPa by 50kPa and for degree of superheat from 0℃ to 10℃ by 1°C at each condensing pressure. As a result of experiment, 1) As degree of superheat increased, evaporating pressure of the compressor decreased so equilibrium temperature decreased. And specific volume of refrigerant vapors increased so refrigerant mass flow and heat load of the evaporator decreased. 2) An influence of change of condensing pressure on heat load of the evaporator was insignificant. 3) With the identical degree of superheat, change of compressed temperature was insignificant according to each condensing pressure, so there was little change in enthalpy. 4) when the degree of superheat is 0℃ at each condensing pressure, the refrigeration system has the highest performance.
프레온 냉동장치의 과열도에 관한 성능 특성 연구 -열교환기 타입별 비교-
홍석주,하옥남,권일욱,윤갑식,홍성인,김진현,김양현 대한설비공학회 2006 설비공학 논문집 Vol.18 No.11
Nowadays heat exchangers that have been applied for freon refrigerating systems, a shell and tube type condenser, but because of their large size, large space for installation and more amount of refrigerants are needed. Therefore, in this study, we will find the most suitable operating condition through the comparison of performance between the shell & tube type and shell & disk type heat exchanger with R22. The experiments are carried out for the condensing pressure of refrigeration system from 1,500kPa to 1,600kPa and for the degree of superheat from 0 to 10℃ at each condensing pressure. As a result of experiment, if the shell & disk type heat exchanger is applied for R22 refrigerating systems, minimized input of refrigerants and space required for installation will be secured, which will have a great contribute to financial improvement for industry.
다양한 각도의 곡관 내에서 아이스슬러리의 유동에 따른 영향
김규목,박기원,권일욱 대한설비공학회 2004 설비공학 논문집 Vol.16 No.2
Recently, the government introduced the thermal storage system for reducing the electric power load. Especially, the ice slurry type has gained lots of interest due to its good heat transfer and flowing characteristics.This study was performed to understand the effects of transporting ice slurry through elbows of various angle. Propylene glycol water solution was used and about 2 mm ice particles were circulated. The experiments were carried out under various conditions, such as concentration and velocity of water solution ranging between 0∼20 wt%, 1.5∼2.5 m/s, respectively. And elbows with 4 different angles of 30 , 45 , 90 , 180 . The differential pressure and IPF (ice packing factor) between the pipe entry and exit were measured.The tendency of pressure loss and outlet IPF in elbow is that the pressure loss was reduced as concentration and flow velocity of water solution is increased, and low value appeared at 10 wt% and 2.5 m/s. The variation of outlet IPF was compared with the inlet IPF in the range of ±20%.