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손병후(Byonghu Sohn),위지혜(Jihae Wi),한은선(Eunseon Han),최항석(Hangseok Choi) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
Among the various thermal properties, thermal conductivity is one of the most important parameters in heat transfer modeling. It is well known that the thermal conductivity of soil is strongly influenced by its density and water content because of contrasting values of its basic components. This paper reviewed and evaluated some of the commonly used prediction models for thermal conductivity of soils with the experimental data available in the literature. Semi-theoretical models for two-component materials were found inappropriate to estimate the thermal conductivity of dry state sands. It came out that the model developed by Cote and Konrad gave the best overall prediction results for unsaturated sands available in the literature. However, it still needs to be improved to cover a wider range of soil types, porosity and degrees of saturation.
손병후(Byonghu Sohn),이승언(Seung-Eon Lee) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
This paper analyzed the applicability of the river water source heat pump system. To present applicability, the river water temperature level was compared with the outdoor air and geothermal temperature levels. Next, the performance was compared through a simulation approach for the river water source heat pump and ground source heat pump (GSHP) system applied to a large-scale office building. In order to compare the temperature level, the actual data were applied to the river water and the outdoor air temperature, and the simulation results were applied to the underground circulation water. The results showed that the change in river water temperature throughout the year was similar to the change in outdoor air temperature. Unlike the outdoor air temperature, the difference between the water temperatures on the hourly and daily average was not large. The temperature level of river water was lower during the heating period than that of the ground circulation water and somewhat higher during the cooling period. Finally, the river water source heat pump system was 13.4% lower annually than the GSHP system.
도로 살얼음 방지용 도로 포장체 집열기-보어홀 축열 시스템 고찰
손병후(Byonghu Sohn),우스만 무하마드(Muhmmad Usman),김용기(Yong-Ki Kim) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
Solar energy is undoubtedly an environment-friendly and inexhaustible energy resource for humans. The concept of road pavement solar collector (RPSC)-borehole thermal energy storage (BTES) is an emerging renewable energy technology, which provides an interesting method for solar and geothermal energy utilization. Fluid circulating through the pipes network embedded in the RPSC can capture the solar energy and store it in the BTES for later use. This paper summarizes the major achievements of the existing literature about RPSC, which is one of the major components of the system. Studies have confirmed the feasibility of harvesting solar energy, cooling the pavement, snow melting/de-icing as well as air conditioning of buildings by applying innovative technologies on road pavement. As seasonal energy storage technology is relatively mature at present, most of the literature reviews focus on the influences of variables associated with system behavior as well as the heat transfer processes during snow melting and solar energy collection. Future work should aim to do more urgent issues involved with RPSC application: construction technology, maintenance technology, and long-term performance. Solving these problems can strengthen the theoretical and practical understanding of the RPSC-BTES systems, and lead to more extensive applications.
노인 요양 시설에서 실내 이산화탄소(CO₂)와 초미세먼지(PM2.5)의 장기 모니터링
손병후(Byonghu Sohn),오석준(Sukjoon Oh),송수원(Suwon Song) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
In developed countries, people spend more than 90% of their time indoors. Indoor environmental conditions are strongly related to health, well-being, and overall performance. With people spending so much time inside buildings, the issue of Indoor Environment Quality(IEQ) becomes especially important; therefore, a set of functional requirements exist to provide increased occupant comfort. Although IEQ plays an important role in all types of buildings, particular consideration should be paid to elderly care centers. In order to contribute to the deepening the knowledge on this subject, this paper presents the results of measurements of indoor carbon dioxide(CO₂) and fine particulate matter(PM2.5) in an ECC in the city of Goyang. After measuring these two parameters for a long time, the indoor concentration trends were analyzed. In addition, the characteristics of concentration changes according to the different purposes of spaces in ECC were analyzed.
손병후(Byonghu Sohn),이승언(Seung-Eon Lee) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
This paper analyzed the applicability of the river water source heat pump system. To present applicability, the river water temperature level was compared with the outdoor air and geothermal temperature levels. Next, the performance was compared through a simulation approach for the river water source heat pump and ground source heat pump (GSHP) system applied to a large-scale office building. In order to compare the temperature level, the actual data were applied to the river water and the outdoor air temperature, and the simulation results were applied to the underground circulation water. The results showed that the change in river water temperature throughout the year was similar to the change in outdoor air temperature. Unlike the outdoor air temperature, the difference between the water temperatures on the hourly and daily average was not large. The temperature level of river water was lower during the heating period than that of the ground circulation water and somewhat higher during the cooling period. Finally, the river water source heat pump system was 13.4% lower annually than the GSHP system.
손병후(Byonghu Sohn),이승언(Seung-Eon Lee) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
This paper analyzed the applicability of the river water source heat pump system. To present applicability, the river water temperature level was compared with the outdoor air and geothermal temperature levels. Next, the performance was compared through a simulation approach for the river water source heat pump and ground source heat pump (GSHP) system applied to a large-scale office building. In order to compare the temperature level, the actual data were applied to the river water and the outdoor air temperature, and the simulation results were applied to the underground circulation water. The results showed that the change in river water temperature throughout the year was similar to the change in outdoor air temperature. Unlike the outdoor air temperature, the difference between the water temperatures on the hourly and daily average was not large. The temperature level of river water was lower during the heating period than that of the ground circulation water and somewhat higher during the cooling period. Finally, the river water source heat pump system was 13.4% lower annually than the GSHP system.
시뮬레이션을 통한 에너지파일 적용 지열 히트펌프 시스템의 성능 예측
손병후(Byonghu Sohn),최종민(Jong Min Choi) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.2
The aim of this study is to evaluate the performance of the GHP system with 150 energy piles for a commercial building. In order to demonstrate the feasibility of a sustainable performance of the system, simulations were conducted over 1-year and 20-year periods, respectively. The 1-year simulation results showed that the maximum and minimum temperatures of brine returning from the energy piles were 23.80℃ and 7.90℃, which were in a range of design target temperatures. In addition, after 20 years’ operation, these returning temperatures decreased slowly to 23.05℃ and 6.98℃, and finally reached to stable state. The results also showed that the energy piles injected heat of 65.6 MWh to the ground and extracted heat of 96.0 MWh from the ground, respectively. Also, it is expected this GHP system with energy piles can operate with average SPF of more than 4.15 for long term.