• Title/Summary/Keyword: High $CO_2$

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A Study on Quantity of CO2 Emission about Remodeling Cycle at High-rise Apartment housing (초고층 공동주택 세대내 개보수 주기에 따른 이산화탄소 배출량 연구)

  • Kim, Dayoo;Kang, Seungyi;Je, Haeseong
    • KIEAE Journal
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    • v.10 no.3
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    • pp.75-80
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    • 2010
  • The goal of this study is to figure out the remodeling cycle at high-rise apartment housing and to analysis on quantity of $CO_2$ emission about remodeling cycle. The process of research is as follow; 1) Estimate the remodeling cycle through survey targeting residents at high-rise apartment building. 2) Simulate conditions on the high-rise apartment housing. 3) Calculate quantity of energy consumption and $CO_2$ emission 4) Derive elements that are on high level of environmental load evaluation. The main results of this study is as follow; 1) The cycle of finishing such as wallpaper is shorter than the cycle of building equipment such as elements in a toilet. 2) According to result of calculating $CO_2$ emission, fabric wallpaper and mortar are main factors that impact on the environment. The results is important to show reference points on quantitative measuring evaluation for the environmental-friendly extent.

Influence of Nitrogen moieties on CO2 capture of Carbon Aerogel

  • Jeon, Da-Hee;Min, Byung-Gak;Oh, Jong Gab;Nah, Changwoon;Park, Soo-Jin
    • Carbon letters
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    • v.16 no.1
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    • pp.57-61
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    • 2015
  • Carbon aerogel is a porous carbon material possessing high porosity and high specific surface area. Nitrogen doping reduced the specific surface area and micropores, but it furnished basic sites to improve the $CO_2$ selectivity. In this work, N-doped carbon aerogels were prepared with different ratios of resorcinol/melamine by using the sol-gel method. The morphological properties were characterized by scanning electron microscopy (SEM). Nitrogen content was studied by X-ray photoelectron spectroscopy (XPS) and the specific surface area and micropore volume were analyzed by $N_2$ adsorption-desorption isotherms at 77 K. The $CO_2$ adsorption capacity was investigated by $CO_2$ adsorption-desorption isotherms at 298 K and 1 bar. Melamine containing N-doped CAs showed a high nitrogen content (5.54 wt.%). The prepared N-doped CAs exhibited a high $CO_2$ capture capacity of 118.77 mg/g (at resorcinol/melamine = 1:0.3). Therefore, we confirmed that the $CO_2$ adsorption capacity was strongly affected by the nitrogen moieties.

Characteristics of $CO_2$ Laser Cladding with High Viscosity Mixed Powder (용제와 혼합한 금속분말의 $CO_2$ 레이저 클래딩 특성)

  • 김재도;전병철;이영곤;오동수
    • Journal of Welding and Joining
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    • v.19 no.5
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    • pp.481-485
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    • 2001
  • Laser cladding processing allows rapid transfer of heat to the material being processed with minimum conduction into base metal. The effect of $CO_2$ laser cladding with high viscosity mixed powders was investigated. High viscosity mixed powder consists of bronze powder and flux that is used at a high temperature condition. The mixed powder has a high viscosity that it can be easily pasted over a curved or slope substrate. The device for mixed powder was designed and manufactured. It consists of the high viscosity mixed powder feeding system, the preheating system and the shielding gas system which prevents the clad layer from being oxidized. The results of experiment indicated that the feed rate of high viscosity mixed powder was important for later cladding with mixed powder feeding. The high viscosity mixed powder and substrate must be preheated to prevent porosity from breaking at the clad layer. The experimental result shows that the high viscosity mixed can be applied for laser cladding process.

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High Performance 2.2 inch Full-Color AMOLED Display for Mobile Phone

  • Kim, H.K.;Suh, M.S.;Lee, K.S.;Eum, G.M.;Chung, J.T.;Oh, C.Y.;Kim, B.H.;Chung, H.K.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2002.08a
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    • pp.325-328
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    • 2002
  • We developed a high performance 2.2" active matrix OLED display for IMT-2000 mobile phone. Scan and Data driver circuits were integrated on the glass substrate, using low temperature poly-Si(LTPS) TFT CMOS technology. High efficiency EL materials were employed to the panel for low power consumption. Peak luminescence of the panel was higher than 250cd/$m^2$ with power consumption of 200mW.

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Development of Optimum High Pressure Algorithm for a Transcritical $CO_2$ Mobile Air-Conditioning System ($CO_2$ 자동차 에어컨 시스템의 최적 고압 설정 알고리즘 개발에 관한 연구)

  • Lee, Jong-Bong;Lee, Jun-Kyoung
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.3
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    • pp.159-165
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    • 2008
  • This paper deals with the optimum high pressure control algorithm for a transcritical $CO_2$ mobile air-conditioning system with belt-driven compressor to achieve the maximum COP. The experiments were performed to find out the maximum COP conditions with various operating conditions. The experimental results showed that the COP was increased and then decreased with increase of the refrigerant high pressure for the system. Therefore the value of high pressure which has maximum COP could be selected. Furthermore, the strong (linear) relation between the optimum high pressure and the gas cooler outlet temperature was revealed, which suggests the use of a simple controller with only one parameter for the transcritical $CO_2$ cycle.

Effect of High Pressure Carbon Dioxide on Inactivation of Leuconostoc sp. (고압 이산화탄소에 의한 Leuconostoc sp.의 살균 효과)

  • Hong, Seok-In;Park, Wan-Soo;Pyun, Yu-Ryang
    • Korean Journal of Food Science and Technology
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    • v.29 no.6
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    • pp.1202-1207
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    • 1997
  • Inactivation of Leuconostoc sp. isolated from kimchi using carbon dioxide under pressure was investigated in terms of operating parameters in order to evaluate its feasibility as a novel nonthermal process. Inactivation rates increased with increasing pressure, temperature and exposure time, but with decreasing working volume. Microbial reduction of 3 log cycles was achieved within 150 min under a $CO_2$ pressure of $60\;kg/cm^2$ at 30^{\circ}C$. It was confirmed that microbial inactivation by the high pressure $CO_2$ was governed essentially by the characteristic of $CO_2$ mass transfer and thus penetration of $CO_2$, into cells was a rate limiting step to determine efficiency of the inactivation process. The experimental results suggested that the high pressure $CO_2$ treatment could be used as one of the effective nonthermal methods for preserving foods.

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Growth and Photosynthetic Responses of One C3 and Two C4 Chenopodiaceae Plants to Three CO2 Concentration Conditions

  • Ishikawa, Shin-Ichi
    • Journal of Ecology and Environment
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    • v.31 no.4
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    • pp.261-267
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    • 2008
  • Growth and photosynthetic responses of one $C_3$ and two $C_4$ plants in the family Chenopodiaceae in three $CO_2$ concentration $([CO_2])$ conditions-low (about $243{\mu}mol\;mol^{-1}$, LC), present (about 378, PC), and high (about 465, HC)-were investigated in open top chambers. The relative growth rate (RGR) and net assimilation rate in the $C_3$ plant, Chenopodium album, increased with increasing $[CO_2]$, though the RGR was not enhanced significantly in the HC condition. The leaf area ratio and leaf weight ratio of the $C_3$ plant drastically decreased with increasing $[CO_2]$, suggesting that the $C_3$ plant invests more biomass to leaves in lower $[CO_2]$ conditions. The two $C_4$ plants, Atriplex glauca and A. lentiformis, showed relatively small changes in those growth parameters. These photosynthetic-pathway-dependent responses suggest that growth patterns of $C_3$ and $C_4$ plants have been altered by past increases in atmospheric $[CO_2]$ but that there will be relatively little further alteration in the future high-$CO_2$ world.

Facile Synthesis of Hollow CuO/MWCNT Composites by Infiltration-Reduction-Oxidation Method as High Performance Lithium-ion Battery Anodes

  • Zheng, Gang;Li, Zhiang;Lu, Jinhua;Zhang, Jinhua;Chen, Long;Yang, Maoping
    • Journal of Electrochemical Science and Technology
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    • v.11 no.4
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    • pp.399-405
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    • 2020
  • Hollow copper oxide/multi-walled carbon nanotubes (CuO/MWCNT) composites were fabricated via an optimized infiltration-reduction-oxidation method, which is more facile and easy to control. The crystalline structure and morphology were characterized by X-ray diffraction (XRD), and transmission electron microscopy (TEM). The as-prepared CuO/MWCNT composites deliver an initial capacity of 612.3 mAh·g-1 and with 80% capacity retention (488.2 mAh·g-1) after 100 cycles at a current rate of 0.2 A·g-1. The enhanced electrochemical performance is ascribed to the better electrical conductivity of MWCNT, the hollow structure of CuO particles, and the flexible structure of the CuO/MWCNT composites.

Effects of Combined Treatment with High $CO_2$ Concentration and Ascorbic acid on Browning of Fresh-cut 'Fuji' Apples (고농도 $CO_2$와 Ascorbic acid 처리가 신선절단 사과의 갈변에 미치는 영향)

  • Kim, Sun-Young;Cho, Jung-Seok;Jeong, Moon-Cheol;Moon, Kwang-Deog
    • Food Science and Preservation
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    • v.18 no.4
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    • pp.475-480
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    • 2011
  • This papers were studies the effects of high $CO_2$ concentration pretreatment and ascorbic acid on the browning of fresh-cut apples. The prepared samples were dipped in 1% (w/v) ascorbic acid solution (AA). Fresh-cut apples (3 pieces) were packed in polypropylene bags (0.03 mm, $20{\times}15$ cm), and stored at $10^{\circ}C$ for 16 days. AA-treated samples showed higher L value than those of non-treated and control (dipped in water without $CO_2$ pretreatment), while non-treated samples showed higher hardness than AA-treated sample. Total soluble solids, pH, titratable acidity were not affected by high $CO_2$ pretreatment and AA treatment. These result shows high $CO_2$ concentration pretreatment with dipping in 1% ascorbic acid solution (AA) has an effects on controlling enzymatic browning during the storage of fresh-cut 'Fuji' apples.

Analysis of CO/CO2 Ratio Variability According to the Origin of Greenhouse Gas at Anmyeon-do (안면도 지역 온실기체 기원에 따른 CO/CO2 비율 변동성 분석 연구)

  • Kim, Jaemin;Lee, Haeyoung;Kim, Sumin;Chung, Chu-Yong;Kim, Yeon-Hee;Lee, Greem;Choi, Kyung Bae;Lee, Yun Gon
    • Atmosphere
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    • v.31 no.5
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    • pp.625-635
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    • 2021
  • South Korea established the 2050 Carbon Neutral Plan in response to the climate crisis, and to achieve this policy, it is very important to monitor domestic carbon emissions and atmospheric carbon concentration. Both CO2 and CO are emitted from fossil fuel combustion processes, but the relative ratios depend on the combustion efficiency and the strength of local emission regulations. In this study, the relationship between CO2 and CO was analyzed using ground observation data for the period of 2018~2020 at Anmyeon-do site and the CO/CO2 ratio according to regional origin during high CO2 cases was investigated based on the footprint simulated from Stochastic Time-Inverted Lagrangian Transport (STILT) model. CO2 and CO showed a positive correlation with correlation coefficient of 0.66 (p < 0.01), and averaged footprints during high CO2 cases confirmed that air particles mainly originated from eastern and north-eastern China, and inland of Korean Peninsula. In addition, it was revealed that among the cases of high CO2 concentration, when the CO/CO2 ratio is high, the industrial area of eastern China is greatly affected, and when the ratio is low, the contribution of the domestic region is relatively high. The ratio of CO2 and CO in this study is significant in that it can be used as a useful factor in determining the possibility of domestic and foreign origins of climate pollutants.