태양열온수기 적용 냉난방시스템의 CFD를 이용한 실내환경 평가 -제1보 바닥면적과 환기횟수를 중심으로-

김종열,최광환,Kim, Jong-Ryeol,Choi, Kyang-Hyan 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.3

This paper has been conducted to estimate cooling capacity of the dehumidification tower using hot water from a solar water heating system as a energy source of regeneration process when the dehumidification and drying system is applied to room cooling. A solar water heating system was operated and indoor temperature distributions were simulated according to weather conditions when the concerned solution was used to dehumidify room air in the dehumidification tower. Through this simulation researches we found th following results ; It was found that air velocity through supply and return diffusers should be controlled because it can cause uncomfort in dwelling area. It was found that in the sunny morning temperatures of dwelling area 1 and 2 are higher than those of dwelling area 3 and 4. In this research all the calculation results of heating and cooling system supported by solar water heater have confirmed that its cooling capacity could not reach PMV 0, thermal comfort.

대체 프레온 및 자연 냉매를 이용하는 이원 냉동시스템의 성능 예측

김종열(Kim, Jong-Ryeol),노건상(Roh, Geun-Sang) 한국산학기술학회 2012 한국산학기술학회논문지 Vol.13 No.4

본 연구에서는 이원냉동시스템에서 사용되던 저온용 규제프레온냉매 R13 및 고온용 규제프레온냉매 R503의 대체냉매로서 프레온혼합냉매 및 친환경적 자연냉매를 사용하는 이원냉동시스템의 성능특성을 규명하고자 하였다. 이 를 위해 일반적인 이원냉동시스템의 운전범위에서 과냉각도, 과열도, 응축온도, 증발온도, 캐스케이드 열교환기에서의 온도변화를 고려하였다. 고온시스템 및 저온시스템의 작동유체의 종류에 상관없이 이원냉동시스템의 COP는 캐스케이 드의 온도영향을 받고 있으며, 또한 과냉각도가 증가할수록 COP는 높아지지만, 과열도의 영향은 크게 받지 않았다. 따라서 본 연구에서 고온용 시스템 및 저온용 시스템의 작동유체로 대체 프레온혼합냉매 및 자연냉매의 냉매조합 중 에서 (R23/R290), (R23/R600), (R23/R600a), (R23/R717), (R744/R404A) 냉매를 사용하는 이원냉동시스템의 COP는 저 온측에 R23, 고온측에 R22를 사용하는 시스템에 비해 20 ~ 36% 높게 나타났다. In this paper, cycle performance analysis of cascade refrigeration system using alternative FREON refrigerants and natural refrigerants are presented to offer the basic design data for the operating parameters of the system. The operating parameters considered in this study include subcooled and superheated degree, and condensing and evaporating temperature, temperature difference of cascade heat exchanger in cascade refrigeration system. The COP of cascade refrigeration system increases with the increasing subcooled degree, but there is no significant changes with the increasing superheated degree. The COP of cascade refrigeration system depends on evaporating and condensing temperatures of cascade heat exchanger. Therefore, subcooled degree, evaporating and condensing temperature of cascade heat exchanger using alternative FREON refrigerants and natural refrigerants have an effect on the COP of this system. In this paper, COP of cascade refrigeration system using (R23 / R290), (R23 / R600), (R23 / R600a), (R23 / R717), (R744 / R404A) are higher 20 ~ 36 % than (R23 / R22), using R23 for low temperature system and R22 for high temperature system.

CFD를 이용한 태양열온수기 적용 냉난방시스템의 성능추산

김종열(Kim Jong-Ryeol),최광환(Choi Kyang-Hyan),백기동(Paek Gi-Dong),김지원(Kim Ji-Won) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-

This paper has been conducted to estimate cooling capacity of the dehumidification tower using hot water from a solar water heating system as a energy source of regeneration process when the dehumidification and drying system is applied to room cooling. A solar water heating system was operated and indoor temperature distuributions were simulated according to weather conditions when the concernted solution was used to dehumidify room air in the duhumidification tower. From the simulation results, it was found that the case of rainy day showed the best result and pre-cooling took about 2 hours to get cooling effect considering room temperature distribution only, through humidity was not calcualted in each case.

한냉조건에서의 히트펌프 실외기에 서리층을 분석하기 위한 실험장치의 CFD

김종열(Jong Ryeol Kim) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-

In this research, it is to find a method that frost does not form on the outdoor unit to develop a heat pump capable of heating in cold regions. For this reason, we produced an incubator capable of creating an environment of -25℃, and constructed an experimental apparatus so that experiments in the room were possible. However, it is necessary to grasp the characteristics of the air reaching the front of the heat pump outdoor unit installed in the experimental apparatus, and flow analysis was performed using ANSYS CFX, which is general-purpose software. As a result, the flow velocity of the air reaching the front of the outdoor unit in the outdoor unit chamber in the entire region of the simulation conditions (5.0 to 7.5 m/s) has many differences in the upper and lower portions, resulting in a natural state. It turned out that the condition can not be satisfied. Therefore, it is determined that it is necessary to additionally install a frequency divider at the front of the outdoor unit to make the flow velocity constant.

SCM의 선행요인과 활동이 균형성과에 미치는 영향에 관한 연구

김종열(Kim, Jong-Ryeol),양해술(Yang, Hae-Sool) 한국산학기술학회 2007 한국산학기술학회논문지 Vol.8 No.5

본 연구는 중소 제조기업을 중심으로 SCM의 선행요인이 정보공유와 협력에 미치는 영향과 정보공유가 협력에 미치는 영향을 파악하고, 궁극적으로는 SCM의 주요 활동인 정보공유와 협력이 기업의 성과에 미치는 영향을 BSC의 네 가지 관점으로 구분하여 연구하였다. 연구 결과 선행요인인 몰입과 문화의 유사성은 정보공유에 유의한 영향을 미치고 상호신뢰와 기업규모는 협력활동에 유의한 영향을 미치는 것으로 나타났다. 활동간의 관계에서도 정보공유는 협력에 유의적인 것으로 나타났다. SCM 활동과 성과 간의 관계에서는 협력은 4가지의 균형성과 모두에 유의적이었지만 정보공유는 그러하지 못하였다. 그러나 정보가공유가 협력에 유의적이고 협력이 균형성과에 유의적인 영향을 미침에 따라 정보공유 또한 4가지의 균형성과에 간접적인 영향을 미치는 것으로 판명되었다. 따라서 본 연구의 결론은 SCM의 주요 활동인 정보공유와 협력이 선행요인의 영향을 받아서 기업의 균형성과 즉, 고객시각의 성과, 내부 프로세스 시각의 성과, 학습 및 성장시각의 성과, 재무적 시각의 성과에 직접 혹은 간접적으로 영향을 미친다는 사실을 확인할 수 있었다. This study aims at grasping the influence of antecedents within SCM to information sharing and cooperation as well as the influence of information sharing on cooperation among the small & medium-sized manufacturing industries, thus ultimately opening the way to the study on the influence of major activities such as information sharing and cooperation within SCM on the business performance by classifying such influence into four perspectives of BSC. The results of this study revealed that the antecedents such as commitment and cultural similarities exercised a significant influence on information sharing while mutual trust and the size of a corporate weighing with cooperative activities. It also identified the fact that information sharing bore a significant influence on cooperation in terms of relationships among activities. For the relationships between the SCM activities and performance, cooperation proved significant to all four balanced scorecard performances with little significant influence of information sharing on balanced scorecard performance. However, taking into consideration of the significance of information sharing on cooperation as well as the significant influence of cooperation on balanced scorecard performance, it turned out that information sharing also effected a indirect influence on such four types of balanced scorecard performance. In this regard, based on the results of this study, it was identified that information sharing and cooperation, major activities within SCM, had either direct or indirect influence, through the influence of antecedents, on the business balanced scoreboard performance measured from a customer perspective, a business process perspective, an innovation and learning perspective and a financial perspective.

친환경 소화약제 Novec1230을 적용하는 궤도차량용 소화기밸브 개발

김종열(Kim, Jong-Ryeol),구학근(Ku, Hak-Keun),오상석(Oh, Sang-Seok) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.4

할론(Halon)은 소화능력이 뛰어나 특수용도의 소화약제로 사용되었지만 오존층 파괴물질로 지목되어 생산 및 사용이 중단되었다. 할론의 대체 소화약제로 Novec1230이 유력하여, 이를 궤도차량용 소화기의 소화약제로 사용하기 위해 소화기 밸브의 구조를 Novec1230의 특성에 맞게 개발해야 한다. 따라서 대체 소화약제용 소화기 밸브의 구조를 6가지로 제작을 완료하였다. 이들의 성능을 검증하기 위해 시험실을 제작하여 비화재시의 소화약제의 분사 형상과 분 사 시간을 실험하였으며, 화재시 소화능력을 파악하였다. 그 결과 A타입과 F타입의 밸브가 다른 4가지 타입보다 20% 이상 그리고 미군의 육군기준(MIL-DTL-62547)인 2-3초보다 178%이상 빠른 시간에 진화되는 친환경 소화약제이므로 Novec1230에 적합하다는 것을 알았다. Halon which is one of the typical fire extinguishing agents for special purposes was banned not only to use but to manufacture because it destroys the earth's ozone layer. There have been many efforts to find or create Halon alternatives and Novec1230 which is one of the eco-friendly fire extinguishing agents is nominated. In this paper 6 kinds of valve structures were suggested to apply Novec1230 to fire extinguishing agents for railroad vehicles as Novec1230 needs different valve specifications from Halon and spray shapes and action time were compared and measured. As the results, the extinguishing times of A type and F type valves are 20% faster than the other 4 types, and 178% faster than MIL-DTL-62547(USA). Therefore, they can be suggested to the eco-friendly extinguishing agents and Novec1230.

세립분의 함유량이 다짐화강토의 역학적 특성에 미치는 영향

김종열(Kim Jong-Ryeol),이용희(Lee Yong-Hee),이진수(Lee Jean-Soo) 대한토목학회 2001 대한토목학회논문집 C Vol.21 No.4

저온에서 고효율 제습기 개발

김종열(Jong-Ryeol Kim) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.9

본 논문은 저온에서 건조한 공기를 필요로 하는 각종 산업설비, 자동화설비, 반도체 제조공정 및 수분 접촉이 되는 화학생산라인, 조선업의 도장 전처리 공정에 필수적이며, 식품 건조에서는단백질 파괴 방지를 억제할 수 있는 중요한 장비인 냉각식 제습기를 개발하였다. 즉 저온(0℃ 이하) 제습방식으로 하기 위해 냉동기 증발기를 4개 설치하였다. 습공기는 순차적으로 3차에 걸쳐 냉각되는데 1차 증발기에서는 증발온도 +13℃, 2차 증발기에서는 증발온도 +5℃ 그리고 3차 증발기에서는 -1.3℃로 유지하게 된다. 4차 증발기에서는 습공기에 포함된 수분을 증발기에 착상시키게 된다. 이때 증발압력이 설정치 이하로 되면 압력 레규레이터(CPCE 12)가 작동되어 제상을 수행하게 되며, 미착상된 공기 중 수분은 고온의 응축기 폐열로서 증발기를 통과한 공기 중 수분을 가열하는 방식으로 구성이 되는 저온에서 제습이 가능한 제습기를 개발하였으며 실험한 결과, 정면풍속 1.0m/s에서 4.0 m/s까지 변화시켜 각 구간에서의 온도와 습도를 측정하였으며, 또한 냉각능력을 산출하였다. 그 결과 정면풍속 2.0m/s에서 냉각능력이 1.77 kcal/h로 가장 크게 나타났다. Various applications require dry air at low temperature, such automation equipment, semiconductor manufacturing, chemical production lines, and coating processes for the shipbuilding industry. Four evaporators for low temperature (below 0℃) were installed for a dehumidification system. Moist air is cooled sequentially over three evaporators. The first evaporator has an evaporation temperature of 13℃, that of the second evaporator is 5℃, and that of the third evaporator is maintained at -1.3℃. In the fourth evaporator implantation thereby the moisture contained in the moisture air. A pressure regulator (CPCE 12) is used at this point and is defrosted when the vapor pressure is below a set value. The non-implantation moisture of the air is a heating system that uses the waste heat of a condenser with high temperature. It develops the cooling type"s dehumidifier, which is important equipment that prevents the destruction of protein and measures the temperature and humidity at each interval by changing the front air velocity from 1.0 m/s to 4.0 m/s. The cooling capacity was also calculated. The greatest cooling capacity was 1.77 kcal/h for a front air velocity of 2.0 m/s

태양열 공기가열시스템 개발을 위한 기초 운전특성

김종열(Kim Jong-Ryeol),최광환(Choi Kwang-Hwan),김두열(Kim Du-Ryeol),Agung 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11

Solar air heaters come in two varieties, active and passive. The Active type uses fans to force the heat through the collector and ducting, while passive types rely on thermal syphoning to circulate air through the house. In both cases cooler air is extracted from either outside or inside the house (at floor level), heated, and then pumped back into the house. The passive type has very specific requirements for mounting (usually outside a window to the ground) so usually opted for the more versatile active type which could be mounted on the roof. A model fabricated based on prototype set up on the roof as an actual system to collect thermal energy from the sun during daytime. The air from outside had been supplied by a blow and heated air was thrown away to the chamber established already. With these experiments, possibility for usage of solar air heater could been identified as an alternative energy for regenerating liquid desiccant in the solar desiccant cooling system.

직접전단시험 형태에 따른 주문진 표준사의 전단정수 고찰

김종열(Kim Jong Ryeol),최용환(Choi Yong Hwan),정자영(Jung Ja Young),강권수(Kang Kwon Su) 대한토목학회 2000 대한토목학회 학술발표회 논문집 Vol.2000 No.2