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비상시 열원중단에 따른 데이터센터의 냉각시스템 열성능 평가에 관한 사례연구
조진균(Jinkyun Cho),강호석(Hosuk Kang) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.5
This study describes the analysis of a 20 MW chilled water plant used for the IT cooling of a recently constructed data center in Korea. The CFD model was developed with the aim of evaluating the impact of problems such as chiller failure on the water and air temperatures in the cooling system. The numerical model includes the chilled water hydraulic network and individual water-to-air CRAC units. The coupling between the IT server room air temperature levels and the cooling plant has enabled a full assessment of the cooling system design in response to system fault conditions to be performed. The paper examines an emergency situation involving the failure of the cooling plant, and shows how the inherent thermal inertia of the system along with additional inertia achieved through buffer systems allowed a suitable design to be achieved.
병원건물의 에너지 저감을 위한 에너지성능 평가에 관한 사례연구
조진균(Jinkyun Cho),문정환(Junghwan Moon),강호석(Hosuk Kang) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.1
Hospitals contribute to energy consumption and have a negative environmental impact. This study aims to find how meaningful energy performance, reflecting good energy management and design, can be planned for hospital buildings, a category encompassing complex buildings with different setups and large differences between them. Energy-consumption characteristics were surveyed throughout Korea to establish statistical energy models. Findings confirm that different hospital departments have hugely different energy-demand profiles. Energy efficiency and energy-saving potentials on HVAC systems are presented. The energy performance analysis can be applied to a wide range of problems in energy-system design and planning, including simulations and optimizations of community energy systems.
병원 내 공기감염의 효과적 방지를 위한 음압격리병실 최적 환기시스템의 실험적 연구
조진균(Cho, Jinkyun),우경헌(Woo, Kyunghun),강호석(Kang, Hosuk) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.3
The purpose of this study is to analyze the removal performance of airborne contamination in a negative airborne infectious isolation room by conducting the field measurement and numerical analysis. This research investigates the pollutant distribution patterns by network ventilation simulation (macro analysis), CFD modeling (micro analysis) and field measurement based on three ventilation systems. An effective ventilation system is crucial to protect doctors, nurses and other healthcare workers from patients with infectious diseases. The results show that ventilation systems utilizing the low-level extraction technique are very effective at removing pollutants in the human breathing zone. A new clean isolation room ventilation strategy has been developed that employs two exhaust air grilles on the wall behind the bed, and is found to have the highest pollutant removal efficiency. The numerical simulation was verified by comparing its prediction result and the field measurement. Isolation room design strategies are formulated based on the results made in this study.
건물의 냉, 난방 부하비율과 HVAC&R 시스템 1차 에너지 소비량의 상관관계분석 및 합리적 설계방안 연구
조진균(Jinkyun Cho),김진호(Jinho Kim),이성재(Suengjae Lee),강호석(Hosuk Kang) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.3
HVAC&R systems account for more than 50% of the energy consumption of buildings. The purpose of this study is to propose an optimal design method for the HVAC&R system and to examine the possibility for the energy conservation of a selected system. The energy demand for cooling and heating is determined by using TRNSYS and HEET. By an interaction between total system efficiency and cooling-to-heating load ratio, the optimal HVAC&R systems will be decided. The results showed that this proposed method is significantly capable of determining optimal system and building design for saving energy.