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대형 Community 건물의 연료전지 구동 복합열원 하이브리드 히트펌프 시스템 성능에 관한 해석적 연구
정동화(Jeong, Dong-Hwa),변재기(Byun, Jae-Ki),최영돈(Choi, Young-Don),조성환(Cho, Sung-Hwan) 한국신재생에너지학회 2008 신재생에너지 Vol.4 No.3
In the present study, performances of fuel cell driven compound source hybrid heat pump system applied to a large community building are simulated. Among several renewable energy sources, ground, river, sea, and waste water sources are chosen as available alternative energies. The performance and energy cost are varied with the hybrid heat pump sources. The system design and operation process appropriate for the surrounding circumstance guarantee the high benefit of the heat pump system applied to a large community building. Th system is driven by fuel cell system instead of the late-night electricity due to the advantages of the low energy cost and waste heat with high temperature.
급탕 2단열교환방식 지역난방 열사용시설의 급탕부하 분배에 관한 연구
정동화(Dong-Hwa Jeong),김주완(Joo-Wan Kim),백영진(Young-Jin Baik),이영수(Young-Soo Lee),정대헌(Dae-Hun Chung) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.4
According to the standards for district heating substation established by Korea District Heating Corporation, water heating supply systems at over 150 Mcal/h capacity must employ the 2-stage heat exchanger that improves the system efficiency by reusing the heat included in the return water of district heating system already used for space heating. In this paper, the operating characteristics of the system in accordance with the load distribution of two heat exchangers for pre-heating and re-heating cold city water are investigated. The results including mass flow rate, return temperature etc. help to manage district heating system economically.
연료전지 구동 지열원 히트펌프 냉ㆍ난방 시스템 성능에 관한 해석적 연구
정동화(Dong Hwa Jeong),변재기(Jae Ki Byun),최영돈(Young Don Choi) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
In the present study, the simulation for the annual operation of the fuel cell driven ground source heat pump system is conducted to provide the material to appraise the possibility of application of this system. The large building equipped with a heat pump system is selected as the subject of the simulation. Large buildings have the economical advantage using heat pump systems due to large load of heating and cooling. The COP for this system is affected by the load of heating and cooling and the heat source temperature. The load of heating and cooling varies with the location and direction of the building. And the operation for a long period brings about the ground temperature variation. The results show the COP variation in various conditions and operating costs of the fuel cell driven ground source heat pump system.
과제 및 자아 지향적 체육수업 분위기의 효과: 학생 행동분석
정동화 ( Dong Hwa Jeong ),유진 ( Yoo Jin ) 한국스포츠심리학회 2011 한국스포츠심리학회지 Vol.22 No.1
본 연구는 과제지향적 분위기(TIC)와 자아지향적(EIC) 분위기 향상을 위한 수업지도 프로그램이 학생들의 체육 수업행동에 미치는 효과를 비교 분석하는데 목적을 두었다. Ames(1992)가 제안한 TARGET 구조(과제, 권위, 인정, 평가, 집단, 시간)를 토대로 개발된 TIC와 EIC 프로그램은 체육수업(농구수업)에 참여하고 있는 중학생 2개 반 학생들(TIC: 37명)과 EIC 프로그램(36명)에게 15회에 걸쳐 적용되었다. 마지막 15회 수업의 학생행동들(적절한 활동, 부적절한 활동, 협력학습, 인식, 과제관련, 비과제관련, 동료학습, 대기시간)은 컴퓨터 행동분석 프로그램(BEST)을 사용하여 비교 분석되었다. 학생 수업행동 분석결과에 따르면, TIC 집단이 적절한 운동행동, 인지적 행동, 과제관련 행동, 동료학습에서 EIC 집단 보다 높은 행동빈도와 지속시간을 나타내었다. 이에 반해, EIC 집단은 TIC 집단 보다 부적절한 운동행동, 과제비관련, 대기시간에서 높은 지속시간을 나타내고 있었다. 본 연구의 결과는 과제지향적 분위기가 자아지향적 분위기보다 더욱 적응적인 성취행동과 연관돼 있다는 성취목표 이론의 예상을 지지하고 있다. The purpose of this study was to verify the applicability of the task(TIC) and ego-involving(EIC) teaching program on students` behaviors in a physical education setting. Based on the TARGET structures(task, authority, recognition, grouping, evaluation, and time), TIC and EIC programs being used in the PE Classes were developed. The students in intact classes were assigned into TIC(n=37) and EIC(n=36) programs in PE classes (basketball lessons) over five weeks(three times a week). Their eight class behaviors(appropriate activity, inappropriate activity, cooperative learning, recognition, task-relevant behavior, task-irrelevant behavior, peer learning, waiting time) were video-taped at the last PE class, and were analyzed by the computerized behavioral assessment technique(BEST). The results of behavioral analyses exhibited that peer learning was the most frequently observed behavior among students in TIC program classe, while task irrelevant behavior was the most frequently observed behavior among students in EIC program classe. These results were discussed with practical approach of the achievement goal theory.
지역난방 시스템의 설계 최적화를 위한 콤팩트 유닛의 해석 프로그램 개발
정동화(Dong-Hwa Jeong),김주완(Joo-Wan Kim),백영진(Young-Jin Baik),이영수(Young-Soo Lee),정대헌(Dae-Hun Chung) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
In the present study the analysis program of the compact unit, the district heating substation, has been developed. Because of the various advantages, such as a cooperation with other energy systems, district heating system is utilized throughout the world where is particularly in large demand of heat and hot water. To make the advantages of the system greater, the optimum design and operation are required. The simulation using this analysis program gives the information about operation including mass flow rate, temperature, heat transfer coefficients etc. which must meet the standards established by district heating supplier. This information helps engineers to design and operate the district heating system that is more economic and environmental-friendly.