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천병식(Chun Byungsik),박주석(Park Joosuck),박시삼(Park Sisam),정종주(Jung Jongju),공진영(Kong Jinyoung) 한국지반환경공학회 2008 한국지반환경공학회논문집 Vol.9 No.2
본 연구에서는 PGSN(Pressurized Grouting Soil Nailing) 시스템이라는 가압 그라우팅 쏘일네일링 공법을 고안하였으며, 본 공법의 보강제의 길이변화 및 보강재의 변화 등의 설계인자에 따른 거동변화를 파악해 보기 위해 변위제어방식의 현장인발시험을 수행하였다.본 연구에서 수행한9차례의 현장인발시험에서 그라우트 주입비의 변화를 살펴 보기위해 계측을 수행하였으며, 단기거동특성을 평가하기 위해 일반 쏘일네일링 시스템과 비교해 보았다. 가압 그라우트 쏘일네일링 공법의 인발거동 특성을 통해, 중요한 설계인자인 주입압 및 그라우트 주입비 등의 영향을 살펴보았다.시험 결과 가압효과에 따른 인발변형 특성은 중력식 그라우팅 쏘일네일에 비해 가압 그라우팅 쏘일네일의 경우 유발되는 변위량이 30~36% 정도 감소하였고, 보강재 변화에 따른 인발 특성을 살펴보면 이형철근에 비해 강관의 경우 유발되는 변위량이 31~32% 정도 감소하는 것으로 나타났다. In this study, a newly modified soil nailing technology named as the PGSN (Pressurized Grouting Soil Nailing) system is proposed. Effects of various factors related to the design of the pressurized grouting soil nailing system, such as the length of re-bars and type of reinforcement materials, were examined throughout a series of the displacement-controlled field pull-out tests. 9 displacement-controlled field pull-out tests were performed and the ratio of injected grout volume to grout hole volume were also evaluated based on the measurements. In addition, short-term characteristics of pull-out deformations of the newly proposed PGSN system were analyzed and compared with those of the ordinary soil nailing system by carrying out field pull-out tests. The test results were shown that the displacements of pressurized grouting soil nailing system were decreased 30~36% in comparison with using gravity grouting soil nailing system by the pressurized effect. The displacements of steel tube were diminished 31~32% comparison with using deformed bar by the reinforcement type change from the field pull-out tests.
가정용 스털링엔진 및 가스엔진 열병합발전시스템의 성능특성에 관한 연구
최재준(Jaejoon Choi),박병식(Byungsik Park),정대헌(Daeheon Jung),김혁주(Hyouckju Kim),강석훈(Seokhoon Kang),임용훈(Yonghoon Im),송대섭(Daesup Song) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
The unpredicted worldwide oil price makes the energy efficiency technology be more important than any other period. The small cogeneration system is one of the most representative technology among the energy efficiency technologies. Recently, the household cogeneration system has been the center object of attention because of the loss of power transmission and the reasonable energy consumption relative to the household (condensing) boiler producing heat only. A tiny gas-fueled internal combustion engine cogeneration system and two cogeneration systems based on Stirling engine as primary mover which can produce 1㎾ of electrical output were investigated from various aspects. The electrical efficiency and thermal efficiency of the systems were measured. The emission and noise characteristics were also analyzed and compared with each other. The cogeneration system based on internal combustion reciprocating engine was superior to the others in the efficiency of electrical power but was inferior in the noise and vibration level.
가정용 스털링엔진 열병합발전시스템의 성능 특성에 관한 연구
최재준(Jaejoon Choi),박병식(Byungsik Park),정대헌(Daeheon Jung),김혁주(Hyouckju Kim),강석훈(Seokhoon Kang),임용훈(Yonghoon Im),송대섭(Daesup Song) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
The unpredicted worldwide oil price makes the energy efficiency technology be more important than any other period. The small cogeneration system is one of the most representative technology among the energy efficiency technologies. Recently, the household cogeneration system has been the center object of attention because of the loss of power transmission and the reasonable energy consumption policy relative to the household (condensing) boiler producing heat only. Two cogeneration systems based on Stirling engine as primary mover which can produce 1㎾ of electrical output were investigated from various aspects. The electrical efficiency and thermal efficiency of the systems were measured. The experiment was executed at an independent Stirling engine mode, an independent secondary burner mode, and a combined mode. The emission and noise characteristics were also analyzed and compared with each other. The one cogeneration system was superior to the other in the efficiency of electrical power.
가정용 스털링엔진 열병합발전시스템 운전특성에 관한 연구
최재준(Jaejoon Choi),박병식(Byungsik Park),정대헌(Daeheon Jung) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
The unpredicted worldwide oil price makes the energy efficiency technology be more importance than any other period. The small cogeneration system is one of the most representative technology among the energy efficiency technologies, and the Stirling engine cogeneration system has been concerned and investigated due to the preferable characteristics - low toxic emission, low noise and vibration level, and the various form of fuel. A tiny, 1㎾ of electrical output, gas fueled Stirling engine cogeneration system was investigated. The electrical efficiency and thermal efficiency of the system were measured. The experiment was executed at an independent Stirling engine mode, independent secondary burner mode, and the combined mode. Part load characteristics of the Stirling engine cogeneration system were investigated also. With the efficiency characteristics, the O₂ and NOx emission characteristics were measured.
최재준(Jaejoon Choi),박병식(Byungsik Park),정대헌(Daeheon Jung),임용훈(Yonghoon Im),최영호(Youngho Choi),송대섭(Daesup Song) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
The unpredicted worldwide oil price makes the energy efficiency technology be more importance than any other period. The small cogeneration system is one of the most representative technology among the energy efficiency technologies, and recently, the household cogeneration system has been the center object of attention because of the loss of power transmission and the reasonable energy consumption relative to the household (condensing) boiler producing heat only. A tiny, 1kW of electrical output, gas fueled internal combustion engine cogeneration system was investigated. The electrical efficiency and thermal efficiency of the system were measured. With the emission characteristics, the cogeneration system was analyzed. It was showed the gas engine cogeneration system produced the lowest NOx level compared any other cogeneration system due to the three-way catalyst.
1㎾급 스털링엔진 열병합발전시스템의 시동특성에 관한 연구
최재준(Jaejoon Choi),박병식(Byungsik Park),정대헌(Daeheon Jung),김혁주(Hyouckju Kim),임용훈(Yonghoon Im),강석훈(Seokhoon Kang),송대섭(Daesup Song) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The unpredicted worldwide oil price makes the energy efficiency technology be more important than any other period. The small size cogeneration system is one of the most representative technology among the energy efficiency technologies, and the Stirling engine cogeneration system has been concerned and investigated continuously due to the several preferable characteristics - low toxic emission, low noise and vibration level, and the various form of fuel. Unlike the reciprocating-internal combustion engine, Stirling engine must have enough time to warm-up inside the cylinder and working fluid for providing certain given power. So the warm-up time and the time for providing the proper electrical power has been investigated by many researchers. A tiny, 1kW of electrical output, gas fueled Stirling engine cogeneration system's cold start-up and warm start-up characteristics were investigated. The cold start-up test was performed at the fully cold condition and the warm start-up test was performed immediately after the Stirling engine perfectly stopped. The electrical output variation with time was mainly investigated and analyzed at various load conditions. The start-up characteristics of a Stirling engine cogeneration system was finally analyzed.
부하변화에 따른 가정용 스털링엔진 열병합발전시스템의 성능특성에 관한 연구
최재준(Jaejoon Choi),박병식(Byungsik Park),김혁주(Hyouckju Kim),송대섭(Daesup Song) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
The unpredicted worldwide oil price makes the energy efficiency technology be more important than any other period. The small cogeneration system is one of the most representative technology among the energy efficiency technologies. Recently, the household cogeneration system has been the center object of attention because of the loss of power transmission and the reasonable energy consumption policy relative to the household (condensing) boiler producing heat only. A cogeneration system based on Stirling engine as a primary mover which can produce maximum 1.1kW of electrical output was investigated from various aspects. The part load characteristics are investigated mainly. The electrical efficiency and thermal efficiency of the systems were measured. The experiment was executed at an independent Stirling engine mode without operating secondary burner. The electrical efficiency of the system was decreased as the electrical power decreased and the thermal efficiency of the system was increased as the electrical power decreased.