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증발온도 변화에 따른 냉동 사이클에 대한 비교 분석에 관한 연구
윤철순(Chul-soon Youn),이원휘(Won-hui Lee) 산업기술교육훈련학회 2009 산업기술연구논문지 (JITR) Vol.14 No.3
Is made to lower the temperature of the evaporator from the loading condition as a matter of which is identical and when and the degree of superheat increases and the degree of undercooling decreases and is caused by with degree of undercooling according to temperature difference of the misfortune gas changes will be able to increase a degree of superheat and with the misfortune gas heat exchanger. The supercooling to moral decrement brings about a case to moral increase and decreases a refrigeration effect and the record coefficient decreases resultantly. Namely, when the degree of undercooling increases, is joined together with decrement of the flash gas and the case degree decreases and the refrigeration effect increases. The evaporator about under looking downward control operation at the time of compressive elegy remarkably increases under identical conditions and sub-zero 10 degree seed one time affects with strong point of most decrease and the record coefficient makes decrease.
열교환기 구조 변화에 따른 NH₃와 R22의 성능특성연구
하옥남,하경수,이승재,정송태 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
Nowadays HCFCs refrigerant are restricted because it cause depletion of ozone layer. However, natural gases such as ammonia as an organic compound, propane and propylene as hydrocarbon are easy and cheap to obtain as well as environmental. Accordingly, this experiment apply the NH3 and R22 to study the performance characteristic from the superheat control and compare the energy efficiency of two refrigerants from the high performance. The condensing pressure of refrigeration system is increased from 15bar to 16bar and degree of superheat is increased from 0 to 10℃ at each condensing pressure. As the result of experiment, when comparing the each COP, we knew the NH₃ is suitable as the alternative refrigerant of the R22.
NH3 냉동장치의 과열도에 관한 성능 특성 연구(III)-열교환기 타입별 비교-
이종인,김양현,박찬수,하옥남 대한설비공학회 2005 설비공학 논문집 Vol.17 No.12
Recently, production and use of freon substances are restrained due to depletion of ozone layer and grobal warming. In this aspect of environmental problems, the best solution is to use the natural refrigerant such as ammonia. Thus, this study is to find the optimal operating conditions by comparing the performance between the shell and tube type and shell and disk type heat exchangers using the ammonia refrigerant, and to verify the superiority of the shell and disk type heat exchanger that is not used in field of refrigeration and air conditioning. Finally, this study shows that the shell and disk type heat exchanger is applicable to the ammonia refrigeration system, and this system minimizes the refrigerant charge and installation space.
R134a 냉동장치의 과열도 변화에 의한 성능 특성 연구
김성배,하옥남 朝鮮大學校 機械技術硏究所 2007 機械技術硏究 Vol.10 No.1
Since the use of CFCs and HCFCs refrigerants are to be restricted due to the depletion of ozone layer, this experiment applies the R134a gas to study the performance characteristic from the superheat control for improving the energy efficiency. The experiments are carried out for the condensing pressure of refrigeration system from 1.5MPa to 1.6MPa by 0.05 MPa and for superheat temperature from O℃ to 5℃ 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.
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.
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.
암모니아와 프레온을 사용한 냉동장치의 성능에 관한 연구
이승재(Seung-Jae Lee),하옥남(Ok-Nam Ha),정송태(Song-Tae Jeong),하경수(Kyeong-Soo Ha) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Nowadays HCFCs refrigerant are restricted because it cause depletion of ozone layer. However, natural gases such as ammonia as an organic compound, propane and propylene as hydrocarbon are easy and cheap to obtain as well as environmental. Accordingly, this experiment apply the NH3 and R22 to study the performance characteristic from the superheat control and compare the energy efficiency of two refrigerants from the high performance. The condensing pressure of refrigeration system is increased from 15bar to 16bar and degree of superheat is increased from 0 to 10℃ at each condensing pressure. As the result of experiment, when comparing the each COP, we knew the NH3 is suitable as the alternative refrigerant of the R22.
열교환기 구조 변화에 따른 NH₃와 R22의 성능특성연구
하옥남(Ok-Nam Ha),하경수(Kyung-Soo Ha),이승재(Seung-Jae Lee),정송태(Song-Tae Jeong) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5
Nowadays HCFCs refrigerant are restricted because it cause depletion of ozone layer. However, natural gases such as ammonia as an organic compound, propane and propylene as hydrocarbon are easy and cheap to obtain as well as environmental. Accordingly, this experiment apply the NH₃ and R22 to study the performance characteristic from the superheat control and compare the energy efficiency of two refrigerants from the high performance. The condensing pressure of refrigeration system is increased from 15bar to 16bar and degree of superheat is increased from 0 to 10℃ at each condensing pressure. As the result of experiment, when comparing the each COP, we knew the NH₃ is suitable as the alternative refrigerant of the R22.