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LiBr - LiNO3 - LiCl - Ethanol amine 작동매체를 이용한 흡수식 냉난방기의 이론적 성능해석
주우성,김희택,오영심,백영순 ( W . S . Ju,H . T . Kim,Y . S . Oh,Y . S . Baek ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1997 No.0
N/A The new working fluid was selected the water-lithium bromide-lithium nitrate-lithium chloride-Ethanol amine System. mole ratio of LiBr-LiNO₃-LiCl is 5 : 1 : 2. And surfactant as like Ethanol amine was added 5wt% of total amount. The solubility data were obtained in the temperature range 253.15K∼363.15K. The vapor pressure data were correlated as an Antoine-type equation. Duhring charts were constructed through the measurements of solubility and vapor pressure. Thus the operation range of this system were found to be broadened. Heat Capacity of water-lithium bromide-lithium nitrate-lithium chloride-Ethanol amine System is higher than one of lithium bromide system. And COP were obtained at various generator temperature. Finally, COP of water-lithium bromide-lithium nitrate-lithium chloride-Ethanol amine System is higher than one of LiBr system at Te=5℃, Ta=Tc=45℃ and Te=7℃, Ta=Tc=45.
흡수식냉난방기용 다성분 리튬염 작동매체의 증기압 및 용해도 측정
주우성,김희택,오영삼,백영순 ( Woo Sung Ju,Hee Taik Kim,Young Sam Oh,Young Soon Baek ) 한국공업화학회 1998 공업화학 Vol.9 No.1
고효율 공냉형 흡수식 냉방기를 위한 신작동매체로 기존의 LiBr-H₂O계에 높은 흡수성과 용해성를 지닌 LiNO₃과 LiCl 무기물을 각각 첨가하여 제조하였다. 본 연구를 통하여 제조된 다성분계의 작동매체에 대한 용해도와 증기압을 측정하여 기존의 LiBr-H₂O계와 비교 분석하였으며, 이들에 대한 최적혼합비를 각각 구하였다. 용해도 측면에서 LiBr-LiNO₃-H₂O계의 경우, LiBr과 LiNO₃의 최적혼합 몰비는 5 : 1이었으며, 반면 LiBr-LiNO₃-H₂O계의 경우 LiBr, LiNO₃, LiCl의 최적흔합몰비는 5 : 1 : 2로 나타났다 한편 증기압은 LiBr-H₂O계에 LiNO₃의 첨가량이 증가함에 따라 증가하였으나, LiCl의 경우 에는 첨가량이 증가함에 따라 감소하는 경향을 각각 나타내었다. In an effort to obtain high efficiency in air cooled absorption heat pump, a new working fluid has been developed with the addition of LiNO₃ and LiCl to the conventional solution of LiBr-H₂O. The solubility and vapor pressure of the multicomponent salts solution developed in this work were measured and compared with the results of LiBr-H₂0 solution. It was observed that there exists an optimal molar ratio of the inorganic salts in terms of solubility. The molar ratio of LiBr and LiNO₃ was found to be about 5 : 1 in the LiBr-LiNO₃ mixture, and in the case of LiBr-LiNO₃-LiCl mixture, the molar ratio of LiBr, LiNO₃ and LiCl was found to be around 5 : 1 : 2. The vapor pressure of the multicomponent salts solution of the optimal molar ratio was increased with adding LiNO₃, while decreased with adding LiCl.
메탄 플라즈마 분해에 의해 제조된 카본블랙 도전재의 전기화학적 특성에 대한 연구
윤세라,이중기,조원일,백영순,주재백,조병원,Yoon, Se-Rah,Lee, Joong-Kee,Cho, Won-Ihl,Baek, Young-Soon,Ju, Jae-Beck,Cho, Byung-Won 한국전기화학회 2003 한국전기화학회지 Vol.6 No.1
메탄의 플라즈마 열분해 방법에 의해 제조된 카본블랙을 $2\times10^{-2}torr$진공상태에서 $800,\;1300,\;2100^{\circ}C$의 온도로 열처리하여 원시료를 포함하여 물리적$\cdot$화학적 특성이 다른 4개의 시료를 준비하였다. 이 시료들을 리튬이차전지 양극 활물질인 $LiCoO_2$의 도전재로 사용하여 $Li/LiCoO_2$ 반쪽전지를 구성하고 변화된 도전재의 특성에 따른 셀의 전기화학적 특성 차이를 조사하였다 시료를 열처리하였을 때 표면화학그룹이 제거되고 전도도가 높아지면서 도전재로 사용하였을 때 사이클 특성 및 초기 방전용량이 향상되었다. 그러나, $2100^{\circ}C$에서 열처리한 시료를 도전재로 사용한 경우에는 사이클 특성 및 rate capability가 저하되는 것으로 나타났다. 이것은 플라즈마 블랙의 열처리에 의한 구조 변화에 따른 전극 내 분산 특성의 변화가 전도도 특성과 복합적으로 작용하여 제작한 셀의 전기화학적 특성에 영향을 미치기 때문으로 사료된다 열처리 온도가 높아질수록 카본블랙 표면의 관능기가 제거되면서 플라즈마 블랙의 전도도가 증가하였으나, 흑연화의 진행으로 나타난 agglomeration의 증가가 전극 내 분산 특성을 저하시키는 것으로 사료된다 그 결과 $800^{\circ}C$에서 열처리한 시료의 사이클 특성이 가장 우수하였다. Plasma carbon black(PB) which prepared by plasma pyrolysis of methane was treated at 800, 1300 and $2100^{\circ}C$ under $2\times10^{-2}$ torr. Four different samples including raw PB were added to $LiCoO_2$, cathode active material of lithium secondary battery, to investigate effects of properties of plasma black as conductors on electrochemical characteristics. Based on our experimental results, PB conductors with low amount of surface functional groups and high electrical conductivity enhanced the cyclability and the initial discharge capacity. However, deterioration of rate capability and cyclability were observed (or the plasma black treated at $2100^{\circ}C$ For the plasma black conductor prepared from plasma pyrolysis, the effects of properties of carbon black on electrochemical characteristics were combined results of changes in electrical conductivity and structural properties such as agglomeration of plasma black. The conductivity of plasma black increased with treatment temperature, while dispersion of plasma black decreased. As a result, the high cyclability of cell was observed at $800^{\circ}C$ of heat treatment temperature.
포스터 발표 - 에너지환경분과 / 화학공정분과 : LiBr - LiNO3 - LiCl - Ethanol amine 작동매체를 이용한 흡수식 냉난방기의 이론적 성능해석
주우성,김희택,오영심,백영순 ( W . S . Ju,H . T . Kim,Y . S . Oh,Y . S . Baek ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1990 No.3
N/A The new working fluid was selected the water-lithium bromide-lithium nitrate-lithium chloride-Ethanol amine System. mole ratio of LiBr-LiNO₃-LiCl is 5 : 1 : 2. And surfactant as like Ethanol amine was added 5wt% of total amount. The solubility data were obtained in the temperature range 253.15K∼363.15K. The vapor pressure data were correlated as an Antoine-type equation. Duhring charts were constructed through the measurements of solubility and vapor pressure. Thus the operation range of this system were found to be broadened. Heat Capacity of water-lithium bromide-lithium nitrate-lithium chloride-Ethanol amine System is higher than one of lithium bromide system. And COP were obtained at various generator temperature. Finally, COP of water-lithium bromide-lithium nitrate-lithium chloride-Ethanol amine System is higher than one of LiBr system at Te=5℃, Ta=Tc=45℃ and Te=7℃, Ta=Tc=45.
주우성,김희택,오영삼,백영순 ( W . S . Ju,H . T . Kim,Y . S . Oh,Y . S . Baek ) 한국공업화학회 1997 응용화학 Vol.1 No.1
The new working fluids were composed of three salts such as lithium bromide, lithium nitrate and lithium chloride and added two organic surfactants (ethylene glycol, ethanol amine) of 1∼5wt%, respectively. The solubility data were obtained in the temperature range 253.15∼363.15K. The vapor pressure data were correlated as an Antonie`s equation. The properties of working fluids were investigated as functions of surfactant contents. As the surfactant contents were increased, the crystallization temperature of working fluids was determined to decrease. However the vapor pressure was increased with surfactant contents slightly.