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냉각수 활용 히트펌프 설치 위치에 따른 광교 열병합발전소의 성능 특성 예측
박흔동,허기무,윤성훈,문윤재,유호선,이재헌,Park, Heun-Dong,Heo, Ki-Moo,Yoon, Sung-Hoon,Moon, Yoon-Jae,Yoo, Ho-Sun,Lee, Jae-Heon 한국플랜트학회 2014 플랜트 저널 Vol.10 No.2
히트펌프는 연소를 동반하지 않기 때문에 화석연료의 연소과정에서 발생하는 이산화탄소($CO_2$)의 배출을 억제함과 동시에 산업체 폐수, 배증기, 냉각수, 지하수, 하수 등 이미 존재하는 다양한 열을 회수할 수 있다는 장점이 있다. 한국지역 난방공사에는 파주, 고양삼송, 광교 열병합발전소에 폐열회수 조건 및 경제성 등을 고려하여 기기 냉각수 폐열을 열원으로 활용하는 히트펌프를 설치하여 운영하고 있다. 본 논문은 최근 건설된 150 MW급 광교 열병합발전소를 대상으로 상용 프로그램인 THERMOFLEX를 활용하여 기기 냉각수 폐열을 이용한 5 Gcal/h 용량의 히트펌프 설치 위치가 발전소 성능에 미치는 영향에 대해 연구하였다. 총 3가지 경우에 대해 히트펌프의 위치에 따른 성능의 영향을 살펴보았는데, 그 결과 지역 난방수 가열기 전단에 히트펌프를 설치한 경우가 전기출력 감소에도 불구하고 열출력 증가량이 커서 발전소 총효율에서 가장 유리한 것으로 확인되었다. Recently, it is considered that environment and energy are critical issues all over the world. In power generation sector in Korea, almost power stations are constructed and operated as cogeneration plants in conformity with this trend. KDHC(Korea District Heating Corporation) goes one step further adopting renewable energy technology like heat pump using wasted heat for energy-saving and environment improvement. This study investigates the performance characteristics by the location of waste heat recovery heat pumps of 5 Gcal/h capacity in 150 MW-class Gwang-gyo cogeneration plant using commercial software 'THERMOFLEX'. Prior to analysis, the simulations are performed with actual operation data, and then the validation of simulations is verified by checking the error within 2%. After verification, the simulations are carried out with 3 locations and the effect on electrical power output and heat output is analyzed. As a result, overall efficiency of cogeneration plant is the highest in the case of heat pump located before DH(District Heating) Heater because of the largest increase of heat output despite of decrease of electrical power output.
박흔동 ( Heun Dong Park ) 한국축산경영학회 2013 농업경영정책연구 Vol.40 No.2
This study aims at identifying determinants of performance of e-business farmers as business managers and defining the influence of the determi-nants on performance of e-business and causal relationship in order to find out ways to increase the success rate of e-business. The study verified the process of creating performance by the performance determinants and the causal relationship between independent variables and mediator, and be-tween mediator and dependent variables using multiple regression analysis. The model was composed of independent variables including 5 independent variables, 7 competitive strategy activities as mediator variables and 1 dependent variable. Achievement Motive and Management Ability as mana-gerial factors showed positive influence on differentiation strategy and cost advantage strategy. Internal resource and external resource as resource factors were composed and measured as formative factors. The competitive environment recognized by farmers showed non-significant relation for differentiation strategy but it proved causality for the significance of the cost advantage strategy only. Meanwhile, the causal relationships between strategies and performance have a few non-linear patterns, i.e. reversed L-type relation, U-type relation, and inverted U-type relation, in addition to linear relationship. Strategies have the mediating role of other determinants for the performance.
농산물 전자상거래의 효과분석을 위한 프레임워크 개발 및 실증연구
박흔동 ( Heun Dong Park ),오상헌 ( Sang Heon Oh ),문정훈 ( Jung Hoon Moon ),최영찬 ( Young Chan Choe ) 한국농촌지도학회 2009 농촌지도와 개발 Vol.16 No.4
This study attempts to develop a framework to analyze and estimate various effects of agro-product e-commerce, and to find out the actual effects of the farmers operating on-line shopping systems through the developed framework. A depth-interview semi-structured on 5 farmers was acted to seek out latent effects which were disassembled and re-assembled into 3 dimensions; input costs, e-internal effects and e-external effects. E-external effects divide into e-indirect effects and e-societal effects. A survey from 29 farmers reveals that the e-internal effects are 26,929 thousand KRW a year, e-external effects 6,734 thousand KRW, and input costs 7,202 thousand KRW. ROI(Return on Investment) in 2007 is calculated at 367%.
박흔동 ( Heun-dong Park ),김사균 ( Sakyun Kim ),김민정 ( Minjeong Kim ),최영찬 ( Young Chan Choe ) 한국농업정책학회 2011 농업경영정책연구 Vol.38 No.3
The purpose of this study is to categorize e-business farmers and to investigate performance differences among them. Thus, this study classifies development stages of e-business into 5 types and analyses the relevance of resources, environment condition and management ability that affects to performances by the type. 5 types of e-business through cluster analysis have significant differences in financial performance, business flow, etc. And the difference of performance among the divided 3 comparison groups by level and period of e-business is verified. The effect on performance through a stage of development is different. Thus the related supporting project should be different.
덴마크 돈육산업의 가치사슬경영 사례 연구 -Danish Crown을 중심으로-
최영찬 ( Young Chan Choe ),박흔동 ( Heun Dong Park ),장익훈 ( Ik Hoon Jang ) 한국식품유통학회 2010 食品流通硏究 Vol.27 No.4
This paper offers new approach to improve Korean pork industry by analyzing a successful case of danish pork industry. Previous studies on Korean pork industry figured out problems of the industry and suggested various solutions. However, the most of the studies have only proposed alternatives for the problems or have not been based on conceptual frameworks. This paper is based on Michael. E. Porter`s five forces framework for a industry analysis and value chain analysis. First step analyzing of competitive environment for danish pork industry based on the five forces framework. The result shows where danish pork industry is located in the global pork industry. Second step explains a strategical decision of danish pork industry within the framework of Porter`s three generic strategies, which one consisted of cost leadership, product differentiation, and focus. Third step is a value chain analysis for danish pork industry. Demark has a distinctive structure of pork industry, which is led by powerful leadership of Danish Crown and of Danish Bacon&Meat Council. Danish Crown is one of the largest meat processing company, and Danish Bacon&Meat Council is an umbrella organization of Danish pork industry. The value chain analysis finds out how these two main agents are coordinated each other and how each of the agents plays a role in a supply chain of danish pork industry. Fourth step shows competitive advantage of Danish pork industry in terms of mass customization, of strategic supplier relationship, and of customer relationship. In conclusion, implications for Korean pork industry are drawn from previous steps.