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Life cycle cost analysis and smart operation mode of ground source heat pump system
윤석,이승래 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.16 No.4
This paper presents an advanced life cycle cost (LCC) analysis of a ground source heat pump (GSHP) system and suggests a smart operation mode with a thermal performance test (TPT) and an energy pile system constructed on the site of the Incheon International Airport (IIA). First, an economic analysis of the GSHP system was conducted for the second passenger terminal of the IIA considering actual influencing factors such as government support and the residual value of the equipment. The analysis results showed that the economic efficiency of the GSHP system could be increased owing to several influential factors. Second, a multiple regression analysis was conducted using different independent variables in order to analyze the influence indices with regard to the LCC results. Every independent index, in this case the initial construction cost, lifespan of the equipment, discount rate and the amount of price inflation can affect the LCC results. Third, a GSHP system using an energy pile was installed on the site of the construction laboratory institute of the IIA. TPTs of W-shape and spiral-coil-type GHEs were conducted in continuous and intermittent operation modes, respectively, prior to system operation of the energy pile. A cooling GSHP system in the energy pile was operated in both the continuous and intermittent modes, and the LCC was calculated. Furthermore, the smart operation mode and LCC were analyzed considering the application of a thermal storage tank.
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온도 변화를 고려한 압축 벤토나이트 완충재의 수분흡입력 평가
윤석,고규현,이재완,김건영 한국지반공학회 2019 한국지반공학회논문집 Vol.35 No.11
The compacted bentonite buffer is one of the major components of an engineered barrier system (EBS) for the disposal of high-level radioactive waste (HLW), and it is considered the best candidate for the buffer material. The buffer is located between disposal canisters and near-field rock mass, and it interrupts the release of radionuclide from disposal canisters and protect them from the penetration of groundwater. At initial disposal condition, degree of saturation of the compacted bentonite buffer decreases because of high thermal quantities released from the disposal canisters. However, the degree of saturation of the compacted bentonite buffer gradually increases caused by inflow of groundwater. The saturated and unsaturated behavior of the buffer is a very important input data since it can determine the safety performance of EBS. Therefore, this paper investigated water retention capacity (WRC) for the Korean compacted bentonite buffer. The WRC of the compacted bentonite buffer was derived by measuring volumetric water content and water suction when temperature variation was between 24°C∼125°C considering decrease of degree of saturation with respect to temperature increase. The WRC was also derived with the same volumetric water content under the room temperature condition, and it showed 1∼15% larger water suction than high temperature condition.
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향상된 등가 모델링 기법을 이용한 저 손실 대역 통과 필터 설계
윤석,김유선,배석,임영석 대한전자공학회 2022 전자공학회논문지 Vol.59 No.4
본 논문에서는 칩 커패시터의 향상된 등가 모델링 기법을 이용하여, 칩 소자의 임피던스 특성 및 품질계수를 BPF 회로설계에 적용하였다. 제안된 향상된 등가 모델링은 칩 내부 소자 및 허용오차, 기생 소자를 포함하여 임피던스 특성 및 품질계수를 분석할 수 있으며, 향상된 등가 모델링을 응용하여 회로설계에 요구되는 칩 소자 값을 충족시킬 수 있었다. 이를 2차 체비셰프 프로토 타입을 갖는 5G Sub-6GHz 대역 통과 필터 설계에 이를 적용하였으며, 통과 대역 중심주파수에서 측정된 삽입손실은 동일한 등가회로를 이용하는 기존 연구에 비해 제조사별 각각 0.45 dB, 0.7 dB의 저 손실 특성을 가져올 수 있었다.
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윤석,김건영,백민훈,Yoon, Seok,Kim, Geon-Young,Baik, Min-Hoon 한국방사성폐기물학회 2018 방사성폐기물학회지 Vol.16 No.3
A geological repository system consists of a disposal canister with packed spent fuel, buffer material, backfill material, and intact rock. The buffer is indispensable to assure the disposal safety of high-level radioactive waste. Since the heat generated from spent nuclear fuel in a disposal canister is released to the surrounding buffer materials, the thermal properties of the buffer material are very important in determining the entire disposal safety. Especially, since thermal expansion can cause thermal stress to the intact rock mass in the near-field, it is very important to evaluate thermal expansion characteristics of bentonite buffer materials. Therefore, this paper presents a thermal expansion coefficient prediction model of the Gyeongju bentonite buffer materials which is a Ca-bentonite produced in South Korea. The linear thermal expansion coefficient was measured considering heating rate, dry density and temperature variation using dilatometer equipment. Thermal expansion coefficient values of the Gyeongju bentonite buffer materials were $4.0{\sim}6.0{\times}10^{-6}/^{\circ}C$. Based on the experimental results, a non-linear regression model to predict the thermal expansion coefficient was suggested and fitted according to the dry density.
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The influence of air gaps on buffer temperature within an engineered barrier system
윤석,이기준 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.11
High-level radioactive waste produced by nuclear power plants are disposed subterraneously utilizing an engineered barrier system (EBS). A gap inevitably exists between the disposal canisters and buffer materials, which may have a negative effect on the thermal transfer and water-blocking efficiency of the system. As few previous experimental works have quantified this effect, this study aimed to create an experimental model for investigating differences in the temperature changes of bentonite buffer in the presence and absence of air gaps between it and a surrounding stainless steel cell. Three test scenarios comprised an empty cell and cells partially or completely filled with bentonite. The temperature was measured inside the buffers and on the inner surface of their surrounding cells, which were artificially heated. The time required for the entire system to reach 100 ◦C was approximately 40% faster with no gap between the inner cell surface and the bentonite. This suggests that rock–buffer spaces should be filled in practice to ensure the rapid dissipation of heat from the buffer materials to their surroundings. However, it can be advantageous to retain buffer–canister gaps to lower the peak buffer temperature.
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