• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2009년도 하계학술발표대회 논문집
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• pp.332-337
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• 2009

The importance of the evaluation and verification of small-size cogeneration system has been emphasized because there is no KS-code related to the small-size cogeneration system. The evaluation method of small-size engine cogeneration system, regarding Japanese standard JIS B-8122 and international standard organization, ISO-8528, was applied to the system. The evaluation methods, start-test, rapid-load-up and rapid-load-down, etc. were executed at the system, and reasonable results were acquired. The electrical and thermal efficiencies were executed and analyzed at various load conditions. The NOx emission at various load condition was also measured. Finally, the gas engine cogeneration system was installed to a site for actual usage and it was continually operated during more than 6 months as the site condition.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2009년도 하계학술발표대회 논문집
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• pp.309-314
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• 2009

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, 1kW 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 $O_2$ and NOx emission characteristics were measured.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2007년도 동계학술발표대회 논문집
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• pp.453-458
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• 2007

The importance of the evaluation and verification of small-size cogeneration system has been emphasized because there is no KS-code related to the small-size cogeneration system. The evaluation method of small-size engine cogeneration system was investigated by the reference of Japan evaluation code, JIS B-8122 and international standard organization, ISO-8528. Evaluation method was introduced such as start-test, rapid-load-up and rapid-load-down, etc. The evaluation method was applied to the 300kW small-size gas engine cogeneration system newly developed. The precise and strict evaluation and verification of the system will help the developing cogeneration system to optimum condition. It will also be a base document of KS-Code.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집D
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• pp.726-731
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• 2001

A thermal design software is developed for the heat recovery steam generator(HRSG) of combined cogeneration systems. The heat transfer is calculated by using the element method to account for the varying thermal properties across the heat transfer elements. The circulation balance is computed for the evaporator to accurately estimate the steam generation rate and to check the proper circulation of the boiler water through the tubes. The software developed can be used to simulate HRSG systems with various combinations of auxiliary burner, wall superheater, superheater, reheater, evaporator, and economizer. Systems with several different combinations of the system components are successfully tested. And it is concluded that the developed software can be used for the design of heat recovery steam generators with various combinations of heat transfer components.

• 한국수소및신에너지학회논문집
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• 제32권1호
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• pp.77-85
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• 2021

In this paper, entransy analysis is carried out for combined heat and power (CHP) generation system driven by low-grade heat source compared with energy and exergy analyses. The system consists of an organic Rankine cycle (ORC) and an additional process heater in a parallel circuit. Special attention is paid to the effects of the source temperature, turbine inlet pressure, and the working fluid on the thermodynamic performance of the system. Results showed that the work efficiency of entransy is higher than that of energy but lower than that of exergy, wheress the process heat efficiency of entransy is lower than that of energy but higher than that of exergy. Entrancy analysis showed the potential to complement the exergy analysis in the optimal design of the energy system.

• 한국유체기계학회 논문집
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• 제19권2호
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• pp.27-35
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• 2016

The purpose of this study is to develop a method to predict the performance and economics of a micro gas turbine cogeneration system using performance correction curves. The variables of correction curves are ambient temperature, ambient pressure, relative humidity and load fraction. All of the values of correction factors were expressed as relative values with respect to design values at the ISO conditions. Once the correction curves are obtained, system performance can be predicted relatively easily compared to a detailed performance analysis method through a simple multiplication of the correction factors of various variables at any operating conditions. The predicted results using the correction curve method were compared with those by the detailed and more complex performance analysis in a wide operating range, and its feasibility was confirmed. To illustrate the usability of the correction curve method, the results of an economic analysis of a cogeneration system considering varying operating ambient condition and load was presented.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2011년도 추계학술논문집 2부
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• pp.624-627
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• 2011

본 논문에서는 산업단지에 공정증기를 공급하는 열병합 발전소 건설에 대한 타당성 분석시 적용되는 경제성 분석에 대한 것으로, 동일한 보일러 및 주증기 그리고 공정증기 조건하에서 배압터빈 및 복수터빈 적용시 수반되는 경제성 분석을 통해 타당성 있는 시스템을 선정하는데 그 목적이 있다. 복수터빈 방식이 배압터빈 방식에 비해 전력생산량은 약 3배정도 많으나 초기 시설투자비의 증대 및 상대적인 에너지 활용측면에서 낮은 결과를 나타냈다.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2006년도 추계학술발표대회 논문집
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• pp.484-487
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• 2006

Today, the age of high oil prices is continued, due to the energy demand is on the increase and human principlal energy sorce, fossil fuel. As an alternative plan of energy saving, co-generation system that produces power and thermal energy at the same time has actively developed. In 1960s, co-generation system was introduced to Korea and since 2000 it has diffused throughout the apartment house. Therefore, objectives of this study are to analyze the energy reduction effects in the region 4 apartment houses of Daegu and Kyungbuk regionand set up a plan for its expansion in the future.

• 에너지공학
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• 제6권1호
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• pp.19-25
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• 1997

본 논문은 각종 보조설비가 연계된 열병합발전시스템에서 가능성 퍼지이론을 이용한 단기운전계획 수립을 나타내고 있다. 가능성 퍼지이론은 계수에 퍼지성을 부여하여 해의 가능성의 범위를 구하는 이론으로서 논문에서는 열출력의 최대값에 퍼지성을 부여하였다. 시뮬레이션은 각 시간대별 열출력의 운전가능범위를 구하는 방향으로 수행되어졌으며 그 결과로서 유연한 운전범위 값을 얻었으며 효과적인 운전계획이 수립되었다.

• 한국가스학회지
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• 제25권4호
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• pp.27-35
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• 2021

최근 "전력 예비율" 급감에 대한 해결책으로 양방향 송배전이 가능한 마이크로 그리드로 전환되고 있다. 마이크로 그리드는 소규모 분산전원과 부하로 구성되는데, 분산전원의 대표적인 기술로 가정·건물에 적용하는 소형 열병합 발전시스템이 있다. 본 연구에서 가스 소비량 232.6kW(20만 kcal/h) 이내의 소형 가스엔진 발전시스템의 안전기준을 도출하고 발전 시스템, 냉각시스템, 윤활 시스템, 배기 시스템으로 구분하여 안전기준(안)을 개발하였다. 발전시스템의 경우 필터를 설치하고 가스 누출 및 엔진 회전수나 출력에 이상이 발생할 경우 이를 감지하여 시스템이 정지하도록 하였고, 냉각시스템은 냉각수 부족이나 과열이 발생할 경우 시스템이 정지하도록 규정하였다. 윤활 시스템은 윤활유의 압력과 온도를 모니터링 하고 이상이 발생할 경우 시스템을 정지하도록 하고, 배기 시스템은 국내·외 기준과 부합하여 배기가스 배출 농도 규제 값을 지정하였다. 본 연구 결과를 통해 가스엔진 발전시스템의 안전성을 향상시키고 제품 확산·보급에 이바지할 수 있다고 판단한다.