• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.152-155
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• 2017

본 논문에서는 에너지 회수를 최대화하기 위하여 전기자동차의 PMSM(Permanent Magnet Synchronous Machine)으로부터 발생된 전압을 제어하는 방법을 다룰 것이다. 이 방법은 PMSM의 제동에너지를 전기에너지로 회생하기 위해 L-C 공진회로를 구성하고 배터리에 많이 충전할 수 있도록 전압을 제어한다. 일반적인 전기자동차의 경우 회생된 큰 전압이 배터리에 들어가 망가지는 현상을 방지하기 위해 스위칭 소자를 사용하여 회로를 끊어주어서 그 큰 전압을 사용하지 못한다. 이러한 회생된 큰 전압으로 제어하여 사용함으로써, 에너지 회수율이 증가하고 전기자동차의 주행거리가 증가할 수 있다. L-C 공진회로에서 FET 게이트에 전압을 인가하는 제어기의 구동 펄스에 따른 전압 변화를 분석하였다. 전압은 듀티에 따라 변해 PI 제어기를 통한 듀티 제어를 하는 전압제어 알고리즘을 연구하였다. 그리고 이를 Matlab Simulink를 이용하여 모의실험을 통해 검증하였다.

• Resources Recycling
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• v.31 no.6
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• pp.3-17
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• 2022

The cement industry, which is an energy-intensive and high carbon dioxide emission industry, requires strategy for carbon neutrality and sustainable development. Most domestic cement companies are generating electricity by waste heat recovery system to improve energy efficiency during cement processes; however, few studies exist on recycling of energy related to this. Certain countries with high cement production researched on modifying the conventional waste heat recovery system to maximize waste heat recovery using various methods such as applying the Rankine cycle depending on the temperature, comparing working fluids, applying two or more Rankine cycles, and combining with other industries. In this study, we reviewed the research direction for energy efficiency improvement by summarizing waste heat recovery and utilization methods in the domestic and overseas cement industries.

• 환경사랑
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• s.38
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• pp.6-8
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• 2004

EPS 총사용량은 중국이 단연 1위이며, 유럽, 미국, 일본, 한국이 그 뒤를 잇고 있다. 단열재 소비는 중국, 유럽, 미국에 이어 한국이 뒤를 잇고 있다. 수산물상자 등 식품포장재의 소비는 유럽, 미국, 일본, 중국 등의 순이다. 가전완충재인 경우 전자제품 제조공장이 인건비가 저렴한 국가로의 이전 등으로 서유럽, 일본, 한국 등의 소비가 감소하고 있고 그 대신 중국, 동부유럽, 동남아시아, 남미 국가들의 소비량이 증가하고 있다. EPS 포장재 다소비 국가 중 재활용실적이 양호한 국가는 독일 $77\%$(에너지 회수포함), 일본 $64\%$(에너지 회수 포함), 한국 $59\%$, 프랑스 $45\%$ 순이었다. 재활용방법은 일본을 제외한 아시아지역은 재생 원료 생산 위주이나, 유럽지역에서는 원료로의 재활용 외에 원원료 회수, 에너지 회수 등 다양한 재활용방법을 이용하고 있다.

• Journal of Energy Engineering
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• v.10 no.3
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• pp.195-205
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• 2001

A great deal of energy is necessary with emission of lots of wastewater in dyeing and finishing process, but heat recovery from wastewater is not introduced since is technology is not developed yet. In order to obtain the method utilizing hot water produced by heat source, that is, dyeing wastewater it was investigated the characteristics of dyeing and finishing process and energy basic unit. Energy basic unit of polyester/cotton (T/C), polyester/rayon (T/R) and polyester dyeing process are higher than that of the other process. The average quantity of wastewater for each dyeing company is 20,470 ton/month, the average temperature of wastewater is about 41$^{\circ}C$. Because the SS solution of wastewater in polyester dyeing process is lower than that of the other process, the effect of corrosion in heat recovery system is low. Since the energy price for 1000 kcal produced by vapor compression heat pump is presumed to be 22.50 won, it is found to be very economic heat recovery system, and its payback is 2.09 years for the factory with LNG boiler.

• Resources Recycling
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• v.18 no.2
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• pp.3-15
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• 2009

To accomplish the greenhouse gas reduction which is over core unit project of the "Green growth" policy and "Resource circulation society", it is important to maintain proper balance and complement between energy recovery from waste and material recycling. This research(study) examined the related policies on the past of korea and foreign country, and also "The 4th resource recycling master plan" and "Energy recovery from waste plan" to provide advisable direction for resource recycling policy. The results of the research(study) showed that there were no significant difference between korea and developed foreign countries waste management policies. But in German policy, energy recovery from waste and pre-treatment are importantly considered and highly required for permission. Under current circumstance in korea, recycling will be more difficult than in the past. According to "The 4th resource recycling master plan", film type of synthetic resin was not sustainable recycled material in substance."Energy recovery from waste plan", proved that the energy recovery from RDF/RPF have lower efficiency than regular incineration generation and substance recycling. To solve these problems, the energy and remainder heat recovery must be generalized to "Energy recovery" concept and institutional improvement such as LCA(Life Cycle Assessment) system are need to support it. And also technology development to extract synthetic polymer by dissolved film type of synthetic resin must be provided.

• Membrane Journal
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• v.33 no.6
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• pp.344-351
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• 2023

The membrane separation process for carbon dioxide capture from hydrogen reformer exhaust gas has been developed. Using a commercial membrane module, a multi-stage process was developed to achieve 90% of carbon dioxide purity and 90% of recovery rate for ternary mixed gas. Even if a membrane module with being well-known properties such as material selectivity and permeability, the process performance of purity and recovery widely varies depending on the stage-cut, the pressure at feed and permeate side. In this study, we verify the limits of capture efficiency at single-stage membrane process under various operating conditions and optimized the two-stage recovery process to simultaneously achieve high purity and recovery rate.

• 월간 기계설비
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• s.252
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• pp.50-51
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• 2011

서울시는 최근 자원회수시설에서 쓰레기 소각 시 발생하는 질소산화물 저감방식을 개선해 매년 54억원의 예산을 절감하게 됐다고 밝혔다. 이번 아이디어는 독일 쉬텔링거 모어 소각장의 열교환시스템을 벤치마킹한 것으로 마포 자원회수시설 담당 공무원(김창환 주무관)이 지난 해 6월 독일을 방문한 뒤 제안하면서 탄생하게 됐다. 개선 방식은 질소산화물을 제거하기 위해 설치된 SCR촉매탑의 가온시스템을 LNG를 이용한 닥터버너 방식에서 '소각증기 사용 열교환 방식'으로 전환시킨 것이다.

• Journal of Convergence for Information Technology
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• v.11 no.2
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• pp.90-97
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• 2021

In this study, a Bi2Te3 thermoelectric generator (TEG) was fabricated to convert unused thermal energy into useful electrical energy. For the performance test, a dedicated experiment device consisting of a heating block operating with cartridge heaters and a cooling block through which a refrigerant flows was constructed. A 3×3 array of thermocouples was mounted on the heating block and the cooling block, respectively, to derive the temperature fields and heat transfer rate onto both sides of the TEG. Experiments were conducted for a total of 9 temperature differences, obtaining V-I and P-R curves. The results of 7 variables including Seebeck coefficients that have a major effect on performance were presented as a function of the temperature difference. The feasibility of the energy recovery performance of the developed TEG was verified from the maximum power output of 7.5W and conversion efficiency of 11.3%.

• Journal of Energy Engineering
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• v.15 no.4 s.48
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• pp.284-290
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• 2006

The improvement of energy recovery is mandatory to decrease consumption of fossil fuels and to minimize negative impacts on the environment which originates from large cooling and heating demand. The absorption heat pump technology has a large potential for energy saving in this respect. Absorption heat pump is a means to upgrade waste heat without addition of extra thermal energy. In this study, resorption heat pump for energy recovery has been investigated using methanol-glycerine. The simulated calculation of theoretical thermal efficiency was performed based on the thermodynamic properties of the working fluid over various operating conditions. The thermal efficiency of higher than 0.4 was obtained by raising industrial waste heat, $70{\sim}80^{\circ}C$, by $40^{\circ}C$ in this system.

• The Magazine for Energy Service Companies
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• s.7
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• pp.30-33
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• 2000

전자동 폐수열회수장치의 개발로 인해 YTC엔텍의 주가가 치솟고 있다. 내년도에도 유가가 고공행진을 할 것이라는 전망이 우세한 가운데 이 장치에 관련업계의 관심이 모아지고 있다. 연평균 $30\%$ 이상의 연료절감효과를 나타낼 것으로 보이는 이 장치를 ESCO사업 방식을 통해 YTC엔텍이 보급에 나섰다.