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윤석,김민준,장세은,이기준 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.11
As high-level radioactive waste (HLW) generated from nuclear power plants is harmful to the human body, it must be safely disposed of by an engineered barrier system consisting of disposal canisters and buffer and backfill materials. A gap exists between the canister and buffer material in a HLW repository and between the buffer material and natural rockdthis gap may reduce the water-blocking ability and heat transfer efficiency of the engineered barrier materials. Herein, the basic characteristics and thermal properties of granular bentonite, a candidate gap-filling material, were investigated, and their effects on the temperature change of the buffer material were analyzed numerically. Heat transfer by air conduction and convection in the gap were considered simultaneously. Moreover, by applying the Korean reference disposal system, changes in the properties of the buffer material were derived, and the basic design of the engineered barrier system was presented according to the gap filling material (GFM). The findings showed that a GFM with high initial thermal conductivity must be filled in the space between the buffer material and rock. Moreover, the target dry density of the buffer material varied according to the initial wet density, specific gravity, and water content values of the GFM
尹錫?(Yoon, Seok-woo) 중국어문학연구회 2020 중국어문학논집 Vol.0 No.121
In this article, I have focused on “GuShu-ShiYong”, Li Bai’s work of old age. First, after examining the controversial controversy of this “GuShu-ShiYong”, I decided to regard these poems as Li Bai’s work and started the analysis. This “GuShu-ShiYong” is a poetry of ten scenes near ‘Dang-Tu’. In the first and second poems, Li Bai, with its beautiful landscape, is dreaming of longevity, drinking vitality. From the third number to the fifth number, they recall their spirit by introducing historical figures. Like the bamboo in the sixth, Li Bai himself is proud to have kept his right mind, and in the seventh, he misses those who can acknowledge him. In the eighth, He has worried about himself who can neither transcend the worldly world nor be recognized in the world. In the ninth, he seeks to transcend secularity and eventually finds himself wandering in the immortal world and the worldly world. In the last tenth, he look back at the world, looking at the TianMen Mountain, standing firmly behind him, thinking that his life was not in vain anyway.
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.
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.