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New & Renewable Energy

  • : 한국신·재생에너지학회
  • : 공학분야  >  화학공학
  • : KCI등재
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  • : 1738-3935
  • : 2713-9999
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수록정보
수록범위 : 1권1호(2005)~18권2호(2022) |수록논문 수 : 540
신재생에너지
18권2호(2022년 06월) 수록논문
최근 권호 논문
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KCI등재

저자 : 김현정 ( Hyeonjeong Kim ) , 양인 ( In Yang ) , 한규성 ( Gyu-seong Han )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 2호 발행 연도 : 2022 페이지 : pp. 1-8 (8 pages)

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This study aimed to determine the optimal conditions for fabricating pitch pine (PCP) and Mongolian oak (MOK) pellets using chestnut-shell tea waste (CSW) and castor oil (CSO) as additives. For pellets fabricated using a pilot-scale flat-die pellet mill, all moisture content (MC) was in line with A1 wood pellet standards for residential and small-scale commercial uses designated by the National Institute of Forest Science at the Republic of Korea (NIFOS), regardless of fabricating conditions; the durability of PCP pellets prepared using PCP particles with 10% MC, and CSW addition also satisfied these criteria. The moisture tolerance of PCP pellets improved with combination of 2 wt% CSW and 2-6 wt% CSO. Overall, use of 20 mesh CSW as an additive, PCP with 10% MC, and MOK with 12% MC was found to be optimal. Moreover, using CSO as an additive, high-quality PCP and MOK pellets can be fabricated by adjusting the particles to 12% MC. However, the durability of PCP and MOK pellets prepared using these conditions did not meet the wood pellet standards for residential and small-scale commercial use. Therefore, further research is needed to improve the durability of these pellets.

KCI등재

저자 : 조경민 ( Kyungmin Cho ) , 오세은 ( Saeeun Oh )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 2호 발행 연도 : 2022 페이지 : pp. 9-17 (9 pages)

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In this study, we used the Flux Balance Analysis (FBA) program to examine the behavior of hydrogen and organic acids according to seasonal changes in food wastewater collected from D city. The results showed that average hydrogen conversion rates in spring, summer, autumn, and winter were 1.06, 0.71, 1.21, and 1.13 mol H2/mol of hexoseadded, respectively, indicating a significantly lower hydrogen conversion rate in summer than in other seasons. This phenomenon is believed to occur because the carbohydrate concentration of the incoming food wastewater is low. In addition, Lactobacillus, the lactic acid-producing bacterium, was 21.3% in spring, 27.2% in summer, 17.5% in autumn, and 22.6% in winter. The most distinctive feature of the microbial community in summer was that 15.3% of the Ilyobacter was analyzed. It was confirmed that Ilyobacter, which is involved in the production of acetic acid and propionic acid, is closely associated with the tendency of increasing acetic acid and propionic acid and thus contributes to organic acid change. Clostridium, a hydrogen-producing bacterium, was 76.2%, 50.8%, 78.3%, and 74%, in spring, summer, autumn, and winter, respectively. It was confirmed that Clostridium dominates the microbial community by approximately 70% or more in all seasons except summer.

KCI등재

저자 : 박래진 ( Rae-jin Park ) , 강성우 ( Sungwoo Kang ) , 이재형 ( Jaehyeong Lee ) , 정승민 ( Seungmin Jung )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 2호 발행 연도 : 2022 페이지 : pp. 18-25 (8 pages)

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In this study, we propose a wind power generation prediction system that applies machine learning and data mining to predict wind power generation. This system increases the utilization rate of new and renewable energy sources. For time-series data, the data set was established by measuring wind speed, wind generation, and environmental factors influencing the wind speed. The data set was pre-processed so that it could be applied appropriately to the model. The prediction system applied the CNN (Convolutional Neural Network) to the data mining process and then used the LSTM (Long Short-Term Memory) to learn and make predictions. The preciseness of the proposed system is verified by comparing the prediction data with the actual data, according to the presence or absence of data mining in the model of the prediction system.

KCI등재

저자 : 안종득 ( Jong-deuk Ahn ) , 이관영 ( Kwan-young Lee ) , 서석호 ( Seok-ho Seo )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 2호 발행 연도 : 2022 페이지 : pp. 26-39 (14 pages)

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Considering the recent substantial increase in national research and development (R&D) budgets in the energy sector there has been increased Interest in the effectiveness of government R&D investments. We conducted a case study to calculate the allowable scale and effectiveness of R&D investment by calculating the direct performance improvement effect resulting from R&D investment as an economic value. Using conditions that existed prior to R&D investments as a reference, five cases in which performance improved due to R&D investments were compared and analyzed. The government's financial investment is increasing rapidly in line with the establishment of the national hydrogen roadmap. R&D is needed to enhance the current low technology readiness level of hydrogen fuel cells compared to solar and wind energy fields. Therefore, an R&D project to improve the performance of the fuel cell system was selected as this case study's subject. Using the results in this study, the allowable level of investment in the task unit of national R&D projects could be calculated. Moreover, it is advisable to provide a standard for rational decision making for new R&D investments since it is possible to determine investment priorities among a large number of candidates.

KCI등재

저자 : 김찬규 ( Chan Gyu Kim ) , 신태호 ( Tae Ho Shin ) , 남중현 ( Jung Hyun Nam ) , 김정현 ( Jung Hyun Kim )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 2호 발행 연도 : 2022 페이지 : pp. 40-49 (10 pages)

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In this study, the phase and electrochemical properties of Co and Ti substituted layered perovskites SmBaCo2-xTixO5+d (x=0.5, 0.7, 1.0, 1.1, 1.3, and 1.5) were analyzed, and their application as electrodes in solid oxide fuel cells (SOFCs) were evaluated. After calcination at 1300℃ for 6 h, a single phase was observed for two compositions of the SmBaCo2-xTixO5+d oxide system, SmBaCoTiO5+d (x=1.0) and SmBaCo0.9Ti1.1O5+d (x=1.1). However, the phases of SmBaCoTiO5+d (SBCTO) and SmTiO3 coexisted for compositions with x≥1.3 (Ti content). In contrast, for compositions of x≤0.7, the SmBaCo2O5+d phase was observed instead of the SmTiO3 phase. To evaluate the applicability of these materials as SOFC electrodes, the electrical conductivities were measured under various atmospheres (air, N2, and H2). SBCTO exhibited stable semi-conductor electrical conductivity behavior in an air and N2 atmosphere. However, SBCTO showed insulator behavior at temperatures above 600℃ in a H2 atmosphere. Therefore, SBCTO may only be used as cathode materials. Moreover, SBCTO had an area specific resistance (ASR) value of 0.140 Ω·cm2 at 750℃.

KCI등재

저자 : 전우영 ( Wooyoung Jeon ) , 김진이 ( Jin-yi Kim ) , 이성우 ( Seongwoo Lee )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 2호 발행 연도 : 2022 페이지 : pp. 50-59 (10 pages)

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The Korean government announced the “1st Basic Plan for the Transition to Hydrogen Economy” in 2021 and declared the establishment of a hydrogen industry ecosystem by 2040. To build a low-carbon power system, resources that can efficiently accommodate renewable energy are required, and green hydrogen is considered a potential solution. This study analyzed the economic feasibility of green hydrogen-based sector coupling to reduce curtailment of renewable generation in the Jeju power system by 2025 under the scenario of with or without HVDC#3. The result showed that HVDC#3 significantly reduced the frequency of curtailment from 16.1% to 3.0%. In addition, green hydrogen-based sector coupling was an economically feasible option as result showed an IRR of 4.86% when HVDC#3 was connected and 11.45% when it was not under the condition of achieving 50% curtailment reduction. This study shows that the higher the level of renewable energy deployment, the more delayed the HVDC connection between Jeju and the main land, and the lower the SMP, the more economically feasible the green hydrogen-based sector coupling is. Furthermore, this study suggests that the policy goal of completely reducing curtailment is not economically efficient.

KCI등재

저자 : 고병국 ( Byungguk Ko ) , 이규환 ( Kyuhwan Lee ) , 윤용범 ( Yongbeum Yoon ) , 박수진 ( Soojin Park )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 2호 발행 연도 : 2022 페이지 : pp. 60-72 (13 pages)

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The environmental, social, and governance (ESG) score is gaining recognition as important nonfinancial investment criteria. With climate change emerging as a global issue, energy companies must pay attention to the ESG impact on corporate performance. In this study, the ESG impact on the performance of energy companies was analyzed based on 23 companies selected from the S&P 500. The panel corrected standard error methodology was used. The Refinitiv ESG score was the independent variable, and financial performance metrics, such as Tobin's Q, return on assets, and return on equity, were the dependent variables. It was found that the ESG score is positively associated with long-term corporate value but not with short-term profitability in the electricity utility industry. Among the subcategories of ESG, the environmental and social scores also showed positive correlations with long-term corporate value. A direct incentive policy is recommended that can offset expenses for ESG activities to reduce carbon emission in the energy sector.

KCI등재

저자 : 황대중 ( Dae-jung Hwang ) , 오철 ( Cheol Oh ) , 박상균 ( Sang-kyun Park ) , 지재훈 ( Jae-hoon Jee ) , 방은신 ( Eun-shin Bang ) , 이병길 ( Byeong-gil Lee )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 2호 발행 연도 : 2022 페이지 : pp. 73-81 (9 pages)

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This study was aimed at designing a condenser, as a component of the organic Rankine cycle system for ships. The condenser was manufactured through press molding to achieve a bent shape to enhance the heat transfer performance, considering the shape of the heat transfer plate used in a brazing plate heat exchanger. The heat transfer plate was made of copper-nickel alloy. The required heat transfer rate for the condenser was 110 kW, and the maximum number of layers was set as 25, considering the characteristics of high-temperature brazing. Computational fluid dynamics techniques were used to perform the thermal fluid analysis, based on the ANSYS CFX (v.18.1) commercial program. The heat transfer rate of the condenser was 4.96 kW for one layer (width and length of 0.224 and 0.7 m, respectively) of the heat transfer exchanger. The fin efficiency pertaining to the heat transfer plate was approximately 20%. The heat flow analysis for one layer of the heat exchanger plate indicated that the condenser with 25 layers of heat transfer plates could achieve a heat transfer rate of 110 kW.

KCI등재

저자 : 한승현 ( Seoung Hyun Han ) , 조재호 ( Jae Ho Jo ) , 권정태 ( Jeong-tae Kwon ) , 박경우 ( Kyoungwoo Park ) , 최병철 ( Byung Chul Choi )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 2호 발행 연도 : 2022 페이지 : pp. 82-89 (8 pages)

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In this study, the exergy characteristics were analyzed, according to the mass flow rate of the propane working fluid and the pressure change in the turbine inlet, for the efficient recovery of cold energy and exhaust heat by the waste energy recovery system applied to the LNG FSRU regasification process. When the turbine inlet pressure and mass flow rate of the Primary Rankine Cycle were kept constant, the exergy efficiency and the net power increased. This occurred as the turbine inlet pressure and the mass flow rate of the working fluid increased in the Secondary Rankine Cycle, respectively, and the maximum values were confirmed. In this regard, the fluctuations in the exergy rate flowing into and out of the system and the exergy rate destroyed by pumps, evaporators, turbines, and LNG heat exchangers (condensers) were examined in detail.

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