Absorption characteristics of nanoparticles with sharp edges for a direct-absorption solar collector

Qin, Caiyan,Kim, Joong Bae,Gonome, Hiroki,Lee, Bong Jae Elsevier 2020 RENEWABLE ENERGY Vol.145 No.-

<P><B>Abstract</B></P> <P>Plasmonic nanofluids has been reported beneficial for enhancing absorption of the solar energy in a direct-absorption solar collector (DASC). In order to overcome the shortage of narrow absorption band associated with the localized surface plasmon, two strategies can be adopted. One is to blend nanoparticles with different absorption peaks, and the other is to develop nanoparticles capable of exhibiting multiple absorption peaks at different wavelengths. In this study, the latter strategy is explored systematically by investigating the absorption efficiency of metallic nanoparticles with sharp edges. The results show that the Ag nanoparticles with sharp edges can induce multiple absorption peaks due to both localized surface plasmon resonance and lightning rod effect. We also show that the sharper edges (i.e., with either smaller radius of curvature or smaller edge angle) can greatly enhance the lightning rod effect. In addition, the study of SiO<SUB>2</SUB>-core/Ag-shell suggests that the core/shell configuration is beneficial for further broadening the absorption band compared to the Ag nanoparticle. Further investigation shows that the solar-weighted absorption coefficient of a DASC using the four-edge nanoparticle is 35% and 20% point higher than the nanosphere and the nanorod respectively with a fixed volume fraction of <SUP> 10 − 6 </SUP> .</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ag nanoparticles with sharp edges can generate multiple absorption peaks. </LI> <LI> Multiple peaks are due to the localized surface plasmon and the lightning rod effect. </LI> <LI> More edges do not necessarily result in broader absorption. </LI> <LI> Core/shell nanoparticles exhibit broader absorption band than the Ag nanoparticles. </LI> <LI> Performance of a DASC with edged particles is much higher than smooth particles. </LI> </UL> </P>

국내 지자체에서의 산림조성과 탄소흡수발자국 평가에 관한 연구

권순길,김준범,전승준 대한환경공학회 2023 대한환경공학회지 Vol.45 No.8

Purpose : At the national level, carbon absorption during the carbon neutrality goal plays an important role, and related forestry projects are continuously increasing. Until now, forest carbon absorption has been measured and managed in various ways at the national level, but specific carbon absorption indicators for each local government have not been approached in various ways. Accordingly, the carbon absorption footprint (CAF) was defined, and the carbon absorption amount and carbon absorption rate were calculated and analyzed to compare and analyze the current situation for each region. Method : As for the research method in this study, standard carbon absorption by tree species was matched on the basis of age level per forest area nationwide as of 2020, and the carbon absorption amount of metropolitan governments, the carbon absorption amount of 250 basic local governments, the carbon absorption amount per national land area, And the carbon absorption footprint per forest area was calculated. Afterward, the carbon absorption rate for the national land area and the carbon absorption rate for the forest area of the basic local governments were calculated. Results and Discussions : As a result of the study, the region with the highest amount of carbon absorption was in the order of Gangwon-do, Gyeongsangbuk-do, and Jeollanam-do, and the lowest carbon absorption was in the order of Gwangju Metropolitan City, Sejong Special Self-Governing City, and Daejeon Metropolitan City. Hongcheon-gun, Inje-gun, and Pyeongchang-gun in Gangwon-do had the highest absorption among basic local governments, followed by Yeongdeungpo-gu in Seoul, Dong-gu in Incheon, and Jung-gu in Busan in order of lowest. Seongbuk-gu, Gwangju-si, and Dong-gu, Daejeon were the basic local governments with a high absorption rate compared to the national land area, followed by Yeongdeungpo-gu, Dong-gu, Incheon, and Seongdong-gu, Seoul, respectively. Lastly, basic local governments with a high carbon absorption rate compared to forest areas were in the order of Seongbuk-gu in Seoul, Ulju-gun in Ulsan, and Hongcheon-gun in Gangwon-do, and Seongdong-gu, Gangdong-gu, and Dongjak-gu in Seoul were in the order of low rates. Overall, a lot of carbon was absorbed in Gangwon-do and Gyeongsangbuk-do, but when approaching the absorption ratio to the national area, on the contrary, Seoul, Gyeonggi, and Incheon showed high absorption rates. The ratio of carbon absorption to forest area was uniform across the country. Results : Based on this study, continuous research is needed to develop a forest creation scenario and achieve more carbon absorption. Since carbon absorption fluctuates greatly depending on forest management, it is considered that it will be an important indicator in terms of strategy presentation in afforestation or sink planning in the future for metropolitan or basic local governments. 목적 : 국가 차원에서 탄소중립 중 탄소흡수는 중요한 역할을 담당하고 있으며, 관련 산림 사업이 지속적으로 증가하는 추세이다. 현재 국가 차원에서 산림의 탄소흡수량은 여러 방법으로 측정 및 관리되고 있지만, 지자체별로 구체적인 탄소흡수지표들에 대해서는 아직까지 다양한 방법으로 접근해오고 있지 않다. 이에 본 연구에서는 탄소흡수발자국의 정의를 내리고, 탄소흡수량 및 탄소흡수비율을 산출 후 비교분석하여 각 지역마다 현 시점을 보여주고자 하였다. 방법 : 연구방법으로는 2020년 기준 전국을 대상으로 산림면적당 임상별(침엽수, 활엽수, 혼효림)/영급별(I~VI급 이상)을 기준으로 수종별 표준탄소흡수량을 매칭하여 광역자치단체의 탄소흡수량과 250개에 대한 기초지방자치단체의 탄소흡수량, 국토면적당 탄소흡수량, 그리고 산림면적당 탄소흡수량의 탄소흡수발자국을 산정하였다. 이후, 기초지방단치단체의 국토면적 대비 탄소흡수 비율, 산림면적 대비 탄소흡수 비율을 산출하였다. 연구결과 및 토론 : 연구결과 광역자치단체 중 흡수량이 높은 지역은 강원도, 경상북도, 전라남도 순이며, 흡수량이 낮은 지역은 광주광역시, 세종특별자치시, 대전광역시 순으로 나왔다. 기초자치단체 중 흡수량이 높은 지자체는 강원도 홍천군, 인제군, 평창군 순이며, 낮은 순으로는 서울시 영등포구, 인천시 동구, 부산시 중구 순으로 나왔다. 국토면적 대비 높은 흡수비율을 가진 기초지방자치단체는 서울시 성북구, 광주시 동구, 대전시 동구 순이며, 낮은 비율은 서울시 영등포구, 인천시 동구, 서울시 성동구 순으로 나타났다. 마지막으로 산림면적 대비 높은 흡수비율을 가진 기초지방자치단체는 서울시 성북구, 울산시 울주군, 강원도 홍천군 순이며, 낮은 비율을 가진 비율은 서울시 성동구, 강동구, 동작구 순으로 나타났다. 전반적으로 강원도와 경상북도 지역에서 많은 탄소흡수를 하였지만 국토면적 대비 흡수비율로 접근해봤을 때, 반대로 서울과 경기, 인천 지역에서 높은 흡수율을 보이고 있었다. 산림면적 대비 흡수비율은 전반적으로 균등하게 나타났다. 결론 : 본 연구를 기반으로 산림 조성 시나리오 개발과 이를 통해 더 많은 탄소흡수를 할 수 있도록 지속적인 연구가 필요한 시점이다. 산림경영에 따라 탄소흡수가 변동이 크기 때문에 추후 광역자치단체나 기초지방자치단체는 조림이나 흡수원 계획에 있어서 전략 제시 측면에서 중요한 지표가 될 것으로 사료된다.

Optical absorption characteristics of brown carbon aerosols during the KORUS-AQ campaign at an urban site

Park, Seungshik,Yu, Geun-Hye,Lee, Sangil Elsevier 2018 Atmospheric research Vol.203 No.-

<P><B>Abstract</B></P> <P>This study investigates the absorption characteristics of brown carbon (BrC) obtained from water and methanol extracts of fine particulate matter measured at an urban site in Gwangju, Korea during the KOREA U.S. – Air Quality campaign (May 2–June 11, 2016). The measurement period was classified into two intervals: biomass burning (BB) and non-BB periods. During the non-BB period, water-soluble organic carbon (WSOC) and humic-like substances (HULIS) primarily resulted from secondary organic aerosol (SOA) formation and primary vehicle emissions. Water-soluble organic aerosols during the BB period, meanwhile, were closely related to SOA formation and regionally transported BB emissions.</P> <P>The light absorption coefficient measured at 365nm (b<SUB>abs,365</SUB>) by methanol extracts was 2.6 and 6.1 times higher than the coefficients from the water and HULIS extracts, respectively, indicating the importance of BrC absorption by water-insoluble organic carbon. This was demonstrated by a good correlation between the water-insoluble BrC absorption and the elemental carbon concentration. A comparison of b<SUB>abs,365</SUB> between the methanol- and water-extracted BrC indicated that water-insoluble BrC accounted for approximately 61% (33–86%) of the total BrC absorption. The contributions of SOA, primary BB emissions, and traffic emissions to the water extract b<SUB>abs,365</SUB> were estimated using a stepwise multiple linear regression (MLR) analysis and found to be 1.17±0.55, 0.65±0.62, and 0.25±0.09Mm<SUP>−1</SUP>, respectively, accounting for 59.6, 26.1, and 14.3% of the absorption coefficient by the water-soluble BrC. Further, it was determined that the contribution of the BB emissions to the water-soluble BrC absorption was approximately two times higher in the BB period than in the non-BB period.</P> <P>The average absorption Ångstrӧm exponent was 4.8±0.3, 5.3±0.7, and 6.8±0.8 for the methanol, water, and HULIS extracts, respectively. The average mass absorption efficiency (MAE<SUB>365</SUB>) of methanol extracted BrC was 1.3±0.4m<SUP>2</SUP>/g·C. Water- and HULIS-extracted BrC had a MAE<SUB>365</SUB> of 1.0±0.3 and 0.8±0.3m<SUP>2</SUP>/g·C, respectively. These results suggest that methanol-extracted BrC could provide a better estimation of BrC absorption compared to WSOC and HULIS.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Heterogeneous processes were a dominant contributor to NO<SUB>3</SUB> <SUP>-</SUP> and SO<SUB>4</SUB> <SUP>2-</SUP> formation during the non-biomass burning (BB) period. </LI> <LI> Regional transport and high O<SUB>3</SUB> could be important factors for the enhanced NO<SUB>3</SUB> <SUP>-</SUP> and SO<SUB>4</SUB> <SUP>2-</SUP> during the BB period. </LI> <LI> Water-soluble organic aerosols were associated with SOA, regionally transported BB, and traffic emissions. </LI> <LI> About 60% of total brown carbon (BrC) absorption comes from water-insoluble BrC. </LI> <LI> Contribution of BB source to water-soluble BrC absorption was two times higher in the BB period than in the non-BB period. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Control of CO₂ absorption capacity and kinetics by MgO-based dry sorbents promoted with carbonate and nitrate salts

Joo, Hyeonho,Cho, Sung June,Na, Kyungsu Elsevier Science B.V. Amsterdam 2017 Journal of CO₂ utilization Vol.19 No.-

<P><B>Abstract</B></P> <P>MgO-based dry sorbents promoted by various metal carbonate and nitrate salts were prepared via co-precipitation of three precursors (MgO/carbonate/nitrate), wherein effects of metal types in carbonate and nitrate salt, and mole ratios in MgO/carbonate/nitrate on the absorption capacity and kinetics were investigated comprehensively during CO<SUB>2</SUB> absorption/regeneration cycles under temperature swing absorption process (absorption at 300°C with 15% CO<SUB>2</SUB> and regeneration at 500°C with 100% CO<SUB>2</SUB> under dry condition). The CO<SUB>2</SUB> absorption capacity was analyzed with thermal gravimetric analyzer, and the absorption kinetics were compared with rate constant derived by using linear driving force model. According to the change of metal types among Li, Na, K and Ca while variation of the composition in MgO/carbonate/nitrate, CO<SUB>2</SUB> absorption capacity and kinetics were changed dramatically. MgO promoted with CaCO<SUB>3</SUB> and NaNO<SUB>3</SUB> (MC<SUB>0.19</SUB>N<SUB>0.20</SUB>) was the best sorbent showing 30.3wt%, but significant decrease in absorption capacity was observed during three cycles. MgO promoted with Na<SUB>2</SUB>CO<SUB>3</SUB> and NaNO<SUB>3</SUB> (MN<SUB>0.19</SUB>N<SUB>0.15</SUB>) exhibited the largest rate constant of 0.811min<SUP>−1</SUP>, whereas other sorbents are distributed down to 0.046min<SUP>−1</SUP>. In view of sorbent stability, MgO with K<SUB>2</SUB>CO<SUB>3</SUB> and KNO<SUB>3</SUB> (MK<SUB>0.40</SUB>K<SUB>0.03</SUB>) might be good sorbents since they showed very stable absorption/regeneration performances without significant decrease in working capacity during 10 cycles. The present result on the MgO-based sorbent preparation and CO<SUB>2</SUB> absorption performances would provide important selection criteria for MgO-based dry sorbents based on high working capacity, rapid absorption rate, and stability showing stable absorption/regeneration reversibility.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CO<SUB>2</SUB> sorbents were prepared via co-precipitation of MgO with carbonate and nitrate salts. </LI> <LI> CO<SUB>2</SUB> absorption performances were tested under temperature swing condition. </LI> <LI> CO<SUB>2</SUB> absorption performances can be promoted by addition of carbonate and nitrate salts. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Potential of different additives to improve performance of potassium carbonate for CO2 absorption

Rouzbeh Ramezani,Saeed Mazinani,Renzo Di Felice 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.10

The performance of potassium carbonate (K2CO3) solution promoted by three amines, potassium alaninate (K-Ala), potassium serinate (K-Ser) and aminoethylethanolamine (AEEA), in terms of heat of absorption, absorption capacity and rate was studied experimentally. The experiments were performed using a batch reactor, and the results were compared to pure monoethanolamine (MEA) and K2CO3 solutions. The heat of absorption of K2CO3+additive solution was calculated using the Gibbs-Helmholtz equation. In addition, a correlation for prediction of CO2 loading was presented. The results indicated that absorption heat, absorption rate and loading capacity of CO2 increase as the concentration of additive increases. The blend solutions have higher CO2 loading capacity and absorption rate when compared to pure K2CO3. The heat of CO2 absorption for K2CO3+additive solutions was found to be lower than that of the pure MEA. Among the additives, AEEA showed the highest CO2 absorption capacity and absorption rate with K2CO3. In conclusion, the K2CO3+AEEA solution with high absorption performance can be a potential solvent to replace the existing amines for CO2 absorption.

Zinc Absorption of Preschool Children

Kim, Young-Seon 한국식품영양학회 2002 韓國食品營養學會誌 Vol.15 No.1

학령전 아동의 zinc absorption, excretion, balance에 대하여 연구한 결과는 다음과 같다. Zinc absorption은 남자아동의 경우 29.7%, 여자 아동의 경우 23.3%, 평균 25.8%로 나타났다. 대상자의 zinc absorption은 zinc intake와는 상관성이 나타나지 않았으며, zinc balance와 유의적 상관 (p<0.01)을 보였다. Zinc balance는 남자 아동의 경우 평균 3.25mg/day, 여자 아동의 경우 1.78mg/day, 평균 2.34mg/day로 1명의 대상자를 제외하고 모두 positive balance를 보였다. Fecal zinc loss는 평균 6.31mg/day, nary zinc loss는 평균 0.16mg/day였다. zinc intake는 fecal zinc loss및 zinc balance에 유의적 영향을 미치는 것으로 나타났으며 (p<0.01), urinary zinc는 intake의 영향을 받지 않았다. 우리나라 학령전 아동의 zinc absorption 및 balance,는 양호한 것으로 나타났다. 그러나 이 방면의 연구 자료가 많지 않아, 성장기 아동을 대상으로 한 zinc nutrition에 대한 구체적이고 지속적인 연구가 필요하다. This study was performed to estimate the zinc absorption, excretion, and balance of preschool children in Pohang and to evaluate the relationship zinc absorption and related variables. To determine the zinc absorption and excretion, duplicate food samples, pooled feces and urine samples were collected for 3 consecutive days in 21 preschool children. The mean fecal and urine excretions were 7.03mg/day and 0.16mg/day for the boys and 5.87mg/day and 0.15mg/day for the girls. Analyzed daily mean zinc intake was 10.45mg/day for the boys and 7.80mg/day for the girls. The mean apparent absorption rate and balance were 29.7% and 3.25mg for the boys and 23.3%, 1.78mg for the girls. Although the mean apparent absorption rate and balance of boys tended to be higher, there was no significant difference between boys and girls. In this study, subjects showed the positive balance except one. Fecal zinc loss reflected dietary zinc (p<0.01), but urinary zinc loss was unaffected by zinc intake. There was a positive relationship between zinc apparent absorption and zinc balance (p<0.01). These results show that the zinc absorption and balance were favorable.

Moisture Absorption and Desorption Properties of Douglas Fir, Hinoki, Larch, Plywood, and WML BoardⓇ in Response to Humidity Variation

( Hee-jun Park ),( Seok-un Jo ) 한국목재공학회 2020 목재공학 Vol.48 No.4

In this study, the moisture absorption and desorption properties presented by the Health-Friendly Housing Construction Standards of South Korea were compared using the wood of three tree species (Douglas-fir, Hinoki, Larch) and two types of wood-based materials(Plywood, WML Board^Ⓡ). The national standards for functional building materials present that the amounts of moisture absorption and desorption should be at least 65g/㎡ on average, respectively according to the test method under KS F 2611:2009. Therefore, in this study, the moisture absorption/desorption properties of materials with no treatment (Control), with punching, and with surface stain finishing and the moisture absorption/desorption property improvement effects of the treatments were compared and analyzed. According to the results of this study, it was evaluated that all five types of wood and wood-based materials tested did not satisfy the amount of moisture absorption/desorption of at least 65g/㎡, which is the performance standard for moisture absorption/desorption functional building materials, indicating that untreated wood and wood-based materials cannot be applied as functional finishing materials according to the Health-Friendly Housing Construction Standards. The surface stain finishing greatly reduced the moisture absorption and desorption rates of the materials, and the amounts of moisture absorbed and desorbed were also shown to decrease by at least two times on average. When the surfaces of the materials were punched with ∅4mm holes at intervals of 20 mm, the moisture absorption/desorption areas increased from 18% to 51%, and this increase was shown to be capable of increasing the amounts of moisture absorbed/desorbed by 29% on average at the minimum, and 81% on average at the maximum. The effects of punching were shown to be identical even in cases where the materials were stain finished. For the application of wood or wood-based materials as eco-friendly, health-friendly, and moisture absorption/desorption functional building materials hereafter, it is judged that new physical and chemical improvement studies should be conducted, and treatment methods should be developed.

Gintonin absorption in intestinal model systems

Lee, Byung-Hwan,Choi, Sun-Hye,Kim, Hyeon-Joong,Park, Sang-Deuk,Rhim, Hyewhon,Kim, Hyoung-Chun,Hwang, Sung-Hee,Nah, Seung-Yeol The Korean Society of Ginseng 2018 Journal of Ginseng Research Vol.42 No.1

Background: Recently, we identified a novel ginseng-derived lysophosphatidic acid receptor ligand, called gintonin. We showed that gintonin induces $[Ca^{2+}]i$ transient-mediated morphological changes, proliferation, and migration in cells expressing lysophosphatidic acid receptors and that oral administration of gintonin exhibits anti-Alzheimer disease effects in model mice. However, little is known about the intestinal absorption of gintonin. The aim of this study was to investigate gintonin absorption using two model systems. Methods: Gintonin membrane permeation was examined using a parallel artificial membrane permeation assay, and gintonin absorption was evaluated in a mouse everted intestinal sac model. Results: The parallel artificial membrane permeation assay showed that gintonin could permeate an artificial membrane in a dose-dependent manner. In the everted sac model, gintonin absorption increased with incubation time (from 0 min to 60 min), followed by a decrease in absorption. Gintonin absorption into everted sacs was also dose dependent, with a nonlinear correlation between gintonin absorption and concentration at 0.1-3 mg/mL and saturation at 3-5 mg/mL. Gintonin absorption was inhibited by the Rho kinase inhibitor Y-27632 and the sodiumeglucose transporter inhibitor phloridzin. Moreover, lipid extraction with methanol also attenuated gintonin absorption, suggesting the importance of the lipid portion of gintonin in absorption. This result shows that gintonin might be absorbed through passive diffusion, paracellular, and active transport pathways. Conclusion: The present study shows that gintonin could be absorbed in the intestine through transcellular and paracellular diffusion, and active transport. In addition, the lipid component of gintonin might play a key role in its intestinal absorption.

Relationship between carbonaceous components and aerosol light absorption during winter at an urban site of Gwangju, Korea

Park, Seung Shik,Son, Se-Chang Elsevier 2017 Atmospheric research Vol.185 No.-

<P><B>Abstract</B></P> <P>To examine the relationship between the chemical composition of light-absorbing organic aerosols and the absorption properties of the aerosols, daily PM<SUB>2.5</SUB> samples were collected during winter at an urban site of Gwangju, Korea, and analyzed for organic carbon and elemental carbon (OC and EC), water-soluble organic carbon (WSOC), humic-like substances (HULIS), and water-soluble inorganic substances. The real-time black carbon (BC) concentration in PM<SUB>2.5</SUB> was also measured using a dual-spot aethalometer. During the study period, average WSOC/OC and HULIS-C/WSOC ratios were 0.53 and 0.52, respectively. K<SUP>+</SUP>/EC and K<SUP>+</SUP>/OC ratios indicate that biomass burning (BB) emissions are a possible source of the observed carbonaceous aerosols and K<SUP>+</SUP>. Moderate-to-strong correlations of HULIS with NO<SUB>3</SUB> <SUP>−</SUP>, oxalate, SO<SUB>4</SUB> <SUP>2−</SUP>, K<SUP>+</SUP>, CO, and ΔBC (=BC<SUB>@370nm</SUB> −BC<SUB>@880nm</SUB>) suggest that in addition to the primary BB emissions, secondary processing is another important contributor to the formation of HULIS in winter at the site.</P> <P>The average absorption Ångstrӧm exponent (α) of fine aerosols for the wavelengths of 370–950nm and 590–950nm was 1.29 and 1.18, respectively, but the aerosol α value was higher in the near UV wavelength range (370–520nm), with an average of 1.51 (0.76–2.36), indicating that aerosol absorption characteristics during winter were influenced by BB aerosol sources, as well as by traffic emissions. Over the study period, the α<SUB>370–520nm</SUB> value during the highest EC, highest OC, and Asian dust events was 1.42±0.10 (1.26–1.59), 1.44±0.15 (1.16–1.68), and 1.90±0.28 (1.54–2.36), respectively. Higher α<SUB>370–520nm</SUB> values during the Asian dust event were attributed to the influence of dust particles. In addition, the light absorption coefficients of aerosols at 370nm were strongly correlated with OC (R<SUP>2</SUP> =0.76), water-insoluble OC (R<SUP>2</SUP> =0.70), and water-soluble HULIS (R<SUP>2</SUP> =0.64). These tight correlations suggest that water-insoluble fractions of OC, as well as the water-soluble brown carbon, could be important contributors to aerosol light absorption. This study demonstrates that a newly-developed dual-spot aethalometer could be utilized to characterize light absorption properties of organic aerosols and dust particles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sources and formation processes of water-soluble HULIS in wintertime were examined. </LI> <LI> A dual-spot aethalometer was used to characterize the aerosol absorption properties. </LI> <LI> Spectral characteristics of aerosol light absorption were discussed. </LI> <LI> Water-insoluble OC and HULIS contributed significantly to aerosol light absorption. </LI> </UL> </P>

Monitoring the water absorption in GFRE pipes via an electrical capacitance sensors

Altabey, Wael A.,Noori, Mohammad Techno-Press 2018 Advances in aircraft and spacecraft science Vol.5 No.4

One of the major problems in glass fiber reinforced epoxy (GFRE) composite pipes is the durability under water absorption. This condition is generally recognized to cause degradations in strength and mechanical properties. Therefore, there is a need for an intelligent system for detecting the absorption rate and computing the mass of water absorption (M%) as a function of absorption time (t). The present work represents a new non-destructive evaluation (NDE) technique for detecting the water absorption rate by evaluating the dielectric properties of glass fiber and epoxy resin composite pipes subjected to internal hydrostatic pressure at room temperature. The variation in the dielectric signatures is employed to design an electrical capacitance sensor (ECS) with high sensitivity to detect such defects. ECS consists of twelve electrodes mounted on the outer surface of the pipe. Radius-electrode ratio is defined as the ratio of inner and outer radius of pipe. A finite element (FE) simulation model is developed to measure the capacitance values and node potential distribution of ECS electrodes on the basis of water absorption rate in the pipe material as a function of absorption time. The arrangements for positioning12-electrode sensor parameters such as capacitance, capacitance change and change rate of capacitance are analyzed by ANSYS and MATLAB to plot the mass of water absorption curve against absorption time (t). An analytical model based on a Fickian diffusion model is conducted to predict the saturation level of water absorption ($M_S$) from the obtained mass of water absorption curve. The FE results are in excellent agreement with the analytical results and experimental results available in the literature, thus, validating the accuracy and reliability of the proposed expert system.