• Title/Summary/Keyword: 120kJ

Search Result 553, Processing Time 0.037 seconds

Adsorption Characteristics of Reactive Red 120 by Coal-based Granular Activated Carbon : Isotherm, Kinetic and Thermodynamic Parameters (석탄계 입상활성탄에 의한 Reactive Red 120의 흡착 특성 : 등온선, 동력학 및 열역학 파라미터)

  • Lee, Jong Jib
    • Applied Chemistry for Engineering
    • /
    • v.31 no.2
    • /
    • pp.164-171
    • /
    • 2020

  • Adsorption characteristics of reactive red 120 (RR 120) dye by a coal-based granular activated carbon (CGAC) from an aqueous solution were investigated using the amount of activated carbon, pH, initial concentration, contact time and temperature as adsorption variables. Isotherm equilibrium relationship showed that Langmuir's equation fits better than that of Freundlich's equation. The adsorption mechanism was considered to be superior to the adsorption of monolayer with uniform energy distribution. From the evaluated Langmuir separation coefficients (RL = 0.181~0.644), it was found that this adsorption process belongs to an effective treatment area (RL = 0~1). The adsorption energy determined by Temkin's equation and Dubinin-Radushkevich's equation was E = 15.31~7.12 J/mol and B = 0.223~0.365 kJ/mol, respectively. The adsorption process showed the physical adsorption (E < 20 J/mol and B < 8 kJ/mol). The adsorption kinetics followed the pseudo first order model. The adsorption reaction of RR 120 dye on CGAC was found to increase spontaneously with increasing the temperature because the free energy change decreased with increasing the temperature. The enthalpy change (12.747 kJ/mol) indicated an endothermic reaction. The isosteric heat of adsorption (△Hx = 9.78~24.21 kJ/mol) for the adsorption reaction of RR 120 by CGAC was revealed to be the physical adsorption (△Hx < 80 kJ/mol).

  • https://doi.org/10.14478/ace.2020.1007 인용 PDF KSCI

A Study on Application and evaluation of a 120kw Photovoltaic Power Generation system in a real power system (120kW급 태양광 발전시스템의 실 계통 연계 운영에 대한 연구)

  • Hwang, J.H.;Ahn, K.S.;Hwang, I.H.;Lim, H.C.;Oh, J.M.;Kim, S.C.;Kim, S.S.
    • Proceedings of the KIEE Conference
    • /
    • 2006.07a
    • /
    • pp.523-524
    • /
    • 2006

  • This paper summarizes the results of medium-scale(120kW class) installed in a Taeahn steam power system of Korea Western Power Co., Ltd., Scope of the study is development on the practical Technology for Application and evaluation of 120kW class PV system in a real power system. In this paper represent performance of 120kW PV system has been evaluated and analysed with simulation.

  • PDF

Effects of Copper and Zinc Supplementation on Growth Performance, Nutrient Digestibility, Meat and Carcass Characteristics in Finishing Pigs (구리 및 아연의 수준별 급여가 비육돈의 생산성, 영양소 소화율, 육질 및 도체 특성에 미치는 영향)

  • Kim, Y.H.;Kim, H.J.;Park, J.C.;Jung, H.J.;Cho, J.H.;Chen, Y.J.;Yoo, J.S.;Kim, I.C.;Lee, S.J.;Kim, I.H.
    • Food Science of Animal Resources
    • /
    • v.27 no.3
    • /
    • pp.284-289
    • /
    • 2007

  • This study was conducted to investigate the effects of copper and zinc supplementation on growth performance, nutrient digestibility, and meat and carcass characteristics in finishing pigs. A total of 72 $(Landrace{\times}Yorkshire{\times}Duroc)$ pigs (58.47 kg initial BW) were assigned to 6 treatments in a $2{\times}3$ factorial design $(Zn\;levels{\times}Cu\;levels)$. The sources of zinc and copper were Zn-methionine chelate and Cu-methionine chelate, respectively. Zinc levels used were 80 and 120 ppm and copper levels used were 10, 30 and 60 ppm. Throughout the entire experimental period, the average daily gain (ADG) and average daily feed intake (ADFI) were not significantly affected by Cu or Zn levels, or their relative levels. The G:F ratio was significantly affected by the relative levels of Cu and Zn (p<0.05), specifically at 30 ppm Cu and 120 ppm Zn. Dry matter digestibility was significantly affected by the levels of Cu (p<0.02), Zn (p<0.01) and the relative levels of each (p<0.04), in particular at 30 ppm Cu and 120 ppm Zn. Nitrogen digestibility was significantly affected by Zn levels (p<0.01) and the combination of 30 ppm Cu and 120 ppm Zn (p<0.03). The $L^*-value$, shear force, cooking loss and pH were not significantly affected by Cu levels, Zn levels or their combination. The $a^*- (p<0.04)\;and\;b^*- values (p<0.01)$ were significantly affected by Zn levels at 80 ppm. The Water hoding capacity was significantly affected by Cu and Zn in combination (p<0.01) at 10 ppm Cu and 120ppm Zn. The carcass weight, backfat thickness and carcass grade were not significantly affected by Cu levels, Zn levels or their relative levels. The carcass percentage was significantly affected by the combination (p<0.04) of 30ppm Cu and 120ppm Zn. In conclusion, dietary supplementation of Cu and Zn at 30 and 120 ppm, respectively, is effective for feed efficiency, nutrient digestibility and carcass percentage, while at the levels of Cu at 10 ppm and Zn at 120 ppm have effects on WHC.

  • https://doi.org/10.5851/kosfa.2007.27.3.284 인용 PDF KSCI

Commercial Tool Based Modeling and Simulation Analysis of a Grid-Connected for 120kW Photovoltaic Generation System (상용툴을 이용한 120kW급 계통연계형 태양광발전시스템의 모델링 및 모의 해석)

  • Hwang, J.H.;Ahn, K.S.;Kim, Y.S.;Lim, H.C.;Oh, J.M.
    • Proceedings of the KIEE Conference
    • /
    • 2006.07a
    • /
    • pp.519-520
    • /
    • 2006

  • In this paper, to evaluate the grid-connected 120kW class Photovoltaic(PV) system performance, as a consisted of solar cells, PCS, 150kVA transformer station. The paper address modeling and analysis of a grid-connected 120kW class photovoltaic generation system(PV system) PSCAD/EMTD and Psim. A PWM voltage source inverter(VIS) and its current control scheme have been implemented. A P&O(Perturbation and Observation) MPPT algorithms technique modeling has been simulated and analysed.

  • PDF