• Proceedings of the KAIS Fall Conference
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• 2009.05a
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• pp.851-854
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• 2009

최근 화석에너지 고갈과 환경규제 강화로 신 재생에너지 개발 및 보급이 시급해지고 있다. 여러 가지 신재생 에너지 중 폐기물을 이용하는 방법이 에너지원의 잠재적 가치를 비교하였을 때 가장 유망한 에너지원으로 인정되고 있으며, 그 중에서도 폐기물을 고체연료로 가공하는 고형연료가 현실적이고 경제적인 방법으로 인정받고 있다. 하지만 Cl이나 중금속 같은 물질들은 부식성이 강하여 보일러와 같은 열 회수 장치에 고온부식을 일으켜 고형연료의 제한적인 요소로 작용하고 있다. 따라서 울산의 산업단지의 고형연료의 원료가 되는 몇몇 물질을 SEM-EDS로 분석하고, Triangle plot을 통하여 나타내고 고형연료의 처리장치 설계 시 기초가 되는 자료를 제공한다.

• 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%.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2003.05a
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• pp.365-369
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• 2003

이산화탄소 규제 대응 전략으로, 배출되는 온실가스를 분리, 회수, 처리하는 연구가 지속적으로 진행되고 있다. 현재 이산화탄소 저감 연구는 공정개발 초기부터 이산화탄소 배출을 방지하거나 분리하기 쉬운 형태로 설계하는 방식으로 전환되고 있다. 그 예로 고온 순산소 연소 시스템이 제안되었다. 이는 $CO_2$를 가장 효과적으로 저감시키는 방법 중의 하나로 연소에 사용되는 산화제로 순산소를 사용하여 원료를 절감할 수 있고 산소를 사용하기 때문에 배가스 중에 질소분율이 감소하여 배가스에 의한 현열손실을 줄일 수 있으며 또한 배가스 현열을 회수하여 산소를 고온으로 예열시켜 에너지를 추가적으로 절감할 수 있다. 이를 위해 산소를 선택적으로 투과시켜 고순도 산소를 제조할 수 있을 뿐만 아니라 산소제조 장치비를 절감할 수 있는 ITM (Ion Transport Membrane) 신소재 및 산소 투과 공정을 개발하고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.4
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• pp.21-26
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• 2017

In this study, performance tests were conducted to investigate the applicability of a double-tube heat recovery ventilation system. Paper, aluminum, polymer, were investigated as materials for the inner tube using the same exhaust-air volume. In all cases, the temperature exchange efficiency of the aluminum tube was the highest, while the paper tube showed similar results to those of the polymer tube. This probably resulted from the differences in thermal conductivity and thicknesses of the materials. The humidity exchange efficiency was the highest for the paper tubes in all cases, while the aluminum tubes and polymer tubes showed similar results. The total heat exchange efficiency, which includes the values of humidity exchange and temperature exchange, was highest in the case of the paper tube, and the aluminum tube and the polymer tube showed similar results. In the case of the paper tube, sensible heat and latent heat exchange occur at the same time, and the coefficient of energy of the aluminum tube and polymer tube are large values, when to be compared with only applicably sensible heat exchange coefficient of the aluminum tube and the polymer tube of total heat exchange efficiency value. The results of this study could be applied to the design of a ventilation system.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.10a
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• pp.481-482
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• 2013

• Journal of Bio-Environment Control
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• v.12 no.3
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• pp.107-113
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• 2003

This study was carried out to improve the performance of pre-developed heat recovery devices attached to exhaust-gas flue connected to combustion chamber of greenhouse heating system. Four different units were compared in the aspect of heat recovery performance; A-, B-, and C-types are exactly the same with the old ones reported in previous studies. D-type newly developed in this experiment is mainly different with the old ones in its heat exchange area and tube thickness. But airflow direction(U-turn) and pipe arrangement are similar with previous three types. The results are summarized as follows; 1. System performances in the aspect of heat recovery efficiency were estimated as 42.2% for A-type, 40.6% for B-type, 54.4% for C-type, and 69.2% for D-type. 2. There was not significant improvement of heat recovering efficiency between two different airflow directions inside the heat exchange system. But considering current technical conditions, straight air flow pattern has more advantage than hair-pin How pattern (U-turn f1ow). 3. The main factors influencing on heat recovery efficiency were presumably verified to be the total area of heat exchange surface, the thickness of ail-flow pipes, and the convective heat transfer coefficient influenced by airflow velocity under the conditions of allowable pipe durability and safety. 4. Desirable blower capacity for each type of heat recovery units were significantly different to each other. Therefore, the optimum airflow capacity should be determined by considering in economic aspect of electricity required together with the optimum heat recovery performance of given heat recovery systems.

• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.6
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• pp.1151-1158
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• 2017

The Effluent Heat Pipe integral with the heater is a device that recreates unused thermal energy from the plant in winter, and thus reuses unused energy before releasing the exhaust heat. Through the establishment of facility horticulture and glass greenhouses, we identified the problems of our agricultural heaters, and we proposed efficient agricultural efficiency and smart control systems for optimum agricultural efficiency and smart house.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.54 no.4
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• pp.181-187
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• 2005

This paper describes a load simulator with power-recovery capability, which is based on the voltage source converter-inverter set. The load simulator described in this paper can save the electric energy that should be consumed to test the operation and performance of the distributed generation system and the power quality compensator. The load simulator consists of a converter-inverter set with a DSP controller for system control and PWM pulse generation. The converter operates as a universal load to model the linear load and the non-linear load, while the inverter feed the energy back to the power source with harmonic compensation. The load simulator can be widely used in the lab to test the performance of the distributed generation system and the power quality compensator.

• Journal of Power System Engineering
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• v.16 no.3
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• pp.5-9
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• 2012

Novel mechanisms for Energy Recovery Devices are proposed to diminish the pressure loss in the high-pressure reverse-osmosis system. In the beginning, the state-of-the-art in the design of Energy Recovery Devices is reviewed and the features of each model are investigated. The direct-coupled axial piston pump(APP) and axial piston motor(APM) showed 39% energy recovery at operating pressure of reverse osmosis desalination systems, 60 bar. Meanwhile, the developed PM2D model, in which APM pistons are arranged parallel to those of APP, is more compact and showed higher efficiency in a preliminary test. Loss-reduction mechanisms employing rod piston and double raw valve port are additionally proposed to enhance the efficiency and durability of the device.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.539-540
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• 2006

소형 열병합 (CHP, Combined Heat & Power)은 발전 용량이 1MW 이하인 발전 시스템을 지칭하는 용어로, 전기와 더불어 원동기에서 발생한 폐열을 회수하여 사용한 수 있는 발전 시스템을 말한다. 대표적인 원동기로서는 가스 엔진, 터빈, 마이크로 터빈, 연료 전지 등이 있다. 소형 열병합 시스템은 폐열 회수의 특징으로 기존 시스템에 비해 50% 이상의 에너지 이용 효율이 높으며, 기존의 대형 발전 시스템에서 필연적으로 존재하는 송전 및 배전 손실이 존재하지 않는 수요지 발전의 특징도 갖고 있어서 연료 절약형 에너지 생산 시스템으로서의 높은 가치를 가지고 있다. 또 다른 장점으로 열병합 발전 시스템은 여름철의 최대 전력 부하를 제거하는 역할을 할 수 있음으로 국가 전력 수요 공급의 안정화에 기여하는 바가 크다. 본 논문에서는 최근에 개발된 325kW급 열병합 가스엔진 발전 시스템의 주제어를 담당하는 통합 제어 장치의 개발과 소형 열병합 시스템의 시험 결과에 대해서 소개한다.