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New & Renewable Energy

  • : 한국신·재생에너지학회
  • : 공학분야  >  화학공학
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수록정보
수록범위 : 1권1호(2005)~16권4호(2020) |수록논문 수 : 505
신재생에너지
16권4호(2020년 12월) 수록논문
최근 권호 논문
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KCI등재

13D S 전극을 활용한 고에너지밀도 전지 연구

저자 : 송다인 ( Da-in Song )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 16권 4호 발행 연도 : 2020 페이지 : pp. 1-8 (8 pages)

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The possibility of conversion to the RC-MAT propulsion system (gasoline engine → electric motor) was studied. However, as commercial battery capacities are low. it is not possible to change the propulsion system. Nevertheless, development of nex-generation batteries is necessary for high capacity and high energy density. Although Li/S batteries are theoretically suitable as new generation batteries, these batteries are not composed of only Li and S. Hence, ensuring high energy density can be difficult. Moreover, electrolytes are important components in the study of energy density; hence, the battery by Li2S8 Molarity was sorted. There are no studied on its various electrode components. In this study, a Li/S battery was fabricated using an assorted 3D sulfur electrode of high energy density and its electrochemical properties were studied. The Li/S battery has a high energy density of 468 Wh/kg at 1.28 M Li2S8 (A805-1.28). Its capacity rapidly decreased after 1 cycle with more than 1 M Li2S8.

KCI등재

2CO2 배출, 원자력에너지, 신재생에너지 발전량과의 관계분석: 한국, 일본, 독일을 중심으로

저자 : 윤정혜 ( Junghye Yun ) , 강상목 ( Sangmok Kang )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 16권 4호 발행 연도 : 2020 페이지 : pp. 9-22 (14 pages)

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This study analyzed the short- and long-term effects of nuclear and renewable energy generation on CO2 emissions in Korea, Japan, and Germany from 1987 to 2016 by using the unit root test, Johansen cointegration test, and ARDL model. The unit root test was performed, and the Johansen cointegration test showed cointegration relationships among variables. In the long run, in Germany, the generation of both nuclear and renewable energy was found to affect CO2 emission reduction, while South Korea's renewable energy generation, including hydropower, increased the emissions. Japan only showed significance in fossil fuels. In the short run, in the three countries, the generation of nuclear and renewable energy, excluding hydropower, affected CO2 emission. However, in Korea and Germany, nuclear and renewable energy generation, respectively, affected CO2 emission reduction. Although the rest are significant, the results showed that they increased CO2 emissions.

KCI등재

3증속기 현장시험 국내 적용 사례 및 절차 분석

저자 : 이광세 ( Gwang-se Lee ) , 강민상 ( Minsang Kang ) , 김석우 ( Seokwoo Kim ) , 이진재 ( Jin-jae Lee )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 16권 4호 발행 연도 : 2020 페이지 : pp. 23-32 (10 pages)

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The wind turbine gearbox has the longest downtime among other major turbine components such as blades, generators, and main bearings. Therefore, gearbox manufacturers conduct rig tests to evaluate conformity in terms of design and function. Rig tests, however, have limited similarity compared with atmospheric wind turbine operating conditions. Rig test conditions are thoroughly controlled and maintained by testers and the component certificates of gearboxes issued through the test cannot fulfill wind farm operator's requirements. Hence, certification bodies such as DNV-GL and UL require a mandatory gearbox field test report for type certification. The Korea Energy Agency (KEA) also introduced gearbox field test as a part of the KS type certificate in 2016, although it is optional . In this paper, gearbox field test procedures and requirements are introduced, and the first domestic application case of the test is reported. The field test was conducted with a 1.5 MW wind turbine gearbox located in Jeju as the test object.

KCI등재

4잠재디리클레할당을 이용한 한국학술지인용색인의 풍력에너지 문헌검토

저자 : 김현구 ( Hyun-goo Kim ) , 이제현 ( Jehyun Lee ) , 오명찬 ( Myeongchan Oh )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 16권 4호 발행 연도 : 2020 페이지 : pp. 33-40 (8 pages)

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The research topics of more than 1,900 wind energy papers registered in the Korean Journal Citation Index (KCI) were modeled into 25 topics using latent directory allocation (LDA), and their consistency was cross-validated through principal component analysis (PCA) of the document word matrix. Key research topics in the wind energy field were identified as “offshore, wind farm,” “blade, design,” “generator, voltage, control,” 'dynamic, load, noise,” and “performance test.” As a new method to determine the similarity between research topics in journals, a systematic evaluation method was proposed to analyze the correlation between topics by constructing a journal-topic matrix (JTM) and clustering them based on topic similarity between journals. By evaluating 24 journals that published more than 20 wind energy papers, it was confirmed that they were classified into meaningful clusters of mechanical engineering, electrical engineering, marine engineering, and renewable energy. It is expected that the proposed systematic method can be applied to the evaluation of the specificity of subsequent journals.

KCI등재

5Balancing Well 교차혼합 지중열교환기의 스마트 냉난방 히트펌프 시스템의 성능평가에 관한 연구

저자 : 이창희 ( Changhee Lee ) , 김동규 ( Donggyu Kim ) , 유병석 ( Byeoungseok Yu ) , 김부일 ( Booil Kim )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 16권 4호 발행 연도 : 2020 페이지 : pp. 41-48 (8 pages)

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This study performed a single hole operation method using a balancing well-cross-mixed underground heat exchanger, and conducted thermal performance studies of an SCW-type underground heat exchanger using a two-well. The study attempted to change the existing operating method of the two adjacent SCW underground heat exchangers with one ball each. The SCW-type geothermal heat exchanger is considered to enable up to 20% of bleed discharge at maximum load, which makes groundwater usage unequal. The efficiency factor of the geothermal system was improved by constructing the discharged water by cross-mixing two balancing wells to prevent the discharge of groundwater sources and keep the temperature of the underground heat exchanger constant. As a result of the cooling and heating operation with the existing SCW heat exchange system and the balancing well-cross-mixed heat exchange system, the measured performance coefficient improved by 23% and 12% in cooling and heating operations, respectively. In addition, when operating with a balanced cross-mixing heat exchange system, it has been confirmed that the initial basement temperature is constant with a standard deviation of 0.08 to 0.12°C.

KCI등재

6태양광열 시스템의 신뢰성 평가에 관한 연구

저자 : 박태국 ( Tae-kook Park ) , 배승훈 ( Seung-hoon Bae ) , 김상교 ( Sang-kyo Kim ) , 김선민 ( Seon-min Kim ) , 김대환 ( Dae-hwan Kim ) , 엄학용 ( Hak-yong Eom ) , 이근휘 ( Keun-hui Lee )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 16권 4호 발행 연도 : 2020 페이지 : pp. 49-64 (16 pages)

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Photovoltaic and Thermal collector (PV/T) systems are renewable energy devices that can produce electricity and heat energy simultaneously using solar panels and heat exchangers. Since PV/T systems are exposed to the outdoors, their reliability is affected by various environmental factors. This paper presents a reliability test for a PV/T system and evaluates the test results. The reliability assessment entails performance, environment, safety, and life tests. The factor that had the greatest influence on the life of the system was the hydraulic pressure applied to the heat exchanger. A test was conducted by repeatedly applying pressure to the PV/T system, and a reliability analysis was conducted based on the test results. As a result, the shape parameter (β) value of 5.6658 and the B10life 308,577 cycles at the lower 95% confidence interval were obtained.

KCI등재

7태양광 설비투자에 대한 제도적 유인방안 연구: 감가상각법의 경제적 효과 분석

저자 : 김경남 ( Kyung Nam Kim )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 16권 4호 발행 연도 : 2020 페이지 : pp. 65-75 (11 pages)

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The value of tangible assets depreciates over their useful life and this depreciation should be adequately reflected in any tax or financial reports. However, the method used to calculate depreciation can impact the financial performance of solar projects due to the time value of money. Korean tax law stipulates only one method for calculating the depreciation of solar photovoltaic facilities: the straight-line method. Conversely, USA's tax law accepts other depreciation methods as solar incentives, including the modified accelerated cost recovery system (MACRS) and Bonus depreciation method. This paper compares different depreciation methods in the financial analysis of a 10 MW solar system to determine their effect on the financial results. When depreciation was calculated utilizing the MACRS and Bonus depreciation method, the internal rate of return (IRR) was 10.9% and 16.4% higher, respectively, than when the Korean straight-line depreciation method was used. Additionally, the increased IRR resulting from the use of the two US methods resulted in a 20.5% and 27.4% higher net present value, respectively. This shows that changing the depreciation calculation method can redistribute the tax amount during the project period, thereby increasing the discounted cash flow of the solar project. In addition to increasing profitability, USA's depreciation methods alleviate the uncertainty of solar projects and provide more flexibility in project financing than the Korean method. These results strongly suggest that Korean tax law could greatly benefit from adopting USA's depreciation methods as an effective incentive scheme.

KCI등재

8태양전지 모듈의 설치방향에 따른 오염특성 분석

저자 : 이충근 ( Chung Geun Lee ) , 신우균 ( Woo Gyun Shin ) , 임종록 ( Jong Rok Lim ) , 주영철 ( Young Chul Ju ) , 황혜미 ( Hye Mi Hwang ) , 고석환 ( Suk Whan Ko ) , 장효식 ( Hyo Sik Chang ) , 강기환 ( Gi Hwan Kang )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 16권 4호 발행 연도 : 2020 페이지 : pp. 76-82 (7 pages)

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Soiling on the surface of a PV module reduces the amount of light reaching the solar cells, decreasing power performance. The performance of the PV module is generally restored after contaminants on the module surface are washed away by rain, but it accumulates at the bottom of the module owing to the thickness of the module frame, causing an output mismatch on the PV module. Since PV modules are usually installed horizontally or vertically outdoors, soiling can occur at the bottom of the PV module, depending on the installation direction due to external environmental factors. This paper is analyzed the output characteristics of a PV module considering its installation direction and the soiling area. The soiling was simulated to use transparent films with 5% transmittance, and the transmission film was attached to the bottom part of the PV module horizontally and vertically. When the soiling area was 33% of the string at the bottom of the PV module, the power output decreased similarly regardless of installation direction. However, when the soiling area was 66% of the string at the bottom of the PV module, it was confirmed that the output performance decreased sharply when installed vertically rather than horizontally.

KCI등재

9펜톤산화에 의한 바이오매스 분해향상과 펜톤산화 용액 재사용 평가

저자 : 정소연 ( So-yeon Jeong ) , 이재원 ( Jae-won Lee )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 16권 4호 발행 연도 : 2020 페이지 : pp. 83-91 (9 pages)

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In this study, the reusability of the Fenton oxidation solution was evaluated to reduce the cost of the pretreatment process. Biomass was sequential subjected to Fenton oxidation-hydrothermal treatment and enzymatic hydrolysis to produce monosaccharides. The liquid solution recovered after Fenton oxidation contained OH radicals with a concentration of 0.11 mol/L. This liquid solution was reused for a new Fenton oxidation reaction. After Fenton oxidation, hydrothermal treatment was performed under the same conditions as before, and 9.34-13.63 g/L of xylose was detected. This concentration was slightly lower than that of a fresh Fenton oxidation solution (16.51 g/L) but was higher than that obtained by hydrothermal treatment without Fenton oxidation (2.72 g/L). The degradation rate during hydrothermal pretreatment involving Fenton oxidation was 36.02%, which decreased (29.24-31.05%) slightly when the liquid solution recovered after Fenton oxidation was reused. However, the degradation rate increased compared to that measured from hydrothermal treatment without Fenton oxidation (15.21%). Moreover, the yield after enzyme hydrolysis decreased in the following order: fresh Fenton oxidation-hydrothermal treatment (89.64%) > Fenton oxidation with reused solution-hydrothermal treatment (74.84%) > hydrothermal treatment without Fenton oxidation (32.05%).

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1연안해역에서 석유오염물질의 세균학적 분해에 관한 연구

(2006)홍길동 외 1명심리학41회 피인용

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2미국의 비트코인 규제

(2006)홍길동심리학41회 피인용

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2미국의 비트코인 규제

(2006)홍길동41회 피인용

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한국에너지기술평가원 가천대학교 한국에너지기술연구원 서울대학교 전남대학교
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