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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.
저온온수 모세유관 바닥복사 난방시스템의 성능에 관한 실험적 연구
조진균(Jinkyun Cho),박병용(Beungyong Park),이용준(Yongjun Lee),정원호(Wonho Chong) 대한설비공학회 2018 설비공학 논문집 Vol.30 No.2
Radiant floor heating systems with capillary tubes are energy saving systems in which hot water is circulated into capillary tube with a small diameter. In this study, the heating performance of capillary tube system is investigated in an experimental study and a simulation model. The results of the study showed that, the capillary tube radiant floor heating system maintains a more stable floor surface temperature in comparison a PB pipe system. In terms of energy consumption, the capillary tube radiant floor heating system proved to be more efficient than the PB pipe heating system at 40℃ of low temperature hot water supply. The difference between water temperature and room temperature can be held low for heating which saves energy. Low temperature radiant floor heating system with capillary tubes have significant advantages such as health improvement, low energy cost, optimum use of heat source(boiler) and higher operational efficiency.
고밀도 데이터센터 구역단위 냉각시스템 실증연구: 독립모듈 컨테인먼트 및 냉각시스템 성능평가
조진균(Jinkyun Cho),박병용(Beungyong Park),정용대(Yongdae Jeong) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
Owing to the rapid growth of information technology (IT) services over the past decade, such as mobile telecommunication, Internet of Things, big data, and cloud computing, data centers have become the core infrastructure for Industry 4.0. Meanwhile, the energy use of data centers has increased rapidly. In this study, a modular air containment prototype was developed for optimal row-based cooling system for high-density data centers. The main purpose is to evaluate the cooling performance of hybrid(refrigerant-water cooled type) in-row coolers in an independent row-based air containment. The differences and technical features of this in-situ experimental study is that rated cooling performance of hybrid in-row cooling system was evaluated based on the full IT load conditions. The hybrid in-row cooling system was found to be the better efficient in removing heat output of IT equipment based on the observations and experimental results.
조진균(Jinkyun Cho) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
In this study, three cooling system modules for a total IT load of 150 kW were derived to respond to low-density, medium-density, and high-density rack-server configurations according to the IT power density known as a key element of a data center. Data center cooling was divided into a room-based cooling for low-density, row-based cooling for medium-density, and rack-based cooling for a high-density IT load. Compared to the ALT-1 of a room-based cooling module, the required area was reduced by 30% for the row-based cooling system(ALT-2) and 55% for the rack-based cooling (ALT-3). As a result of the energy effciency, the annual PUEcooling of the ALT-1 is 1.33. For ALT-2, the annual power consumption reduces by about 6% compared to ALT-1, PUEcooling is 1.31. The power consumption of ALT-3 reduces by 15% and 9%, respectively, compared to ALT-1 and ALT-2, and the PUEcooling is 1.28. In terms of economic feasibility, the simple payback period of ALT-3 based on ALT-1 is 23 years and that of ALT-2 is 17 years.
제로에너지 건축물 구현을 위한 에너지 융 · 복합시스템의 기술정의 및 시장현황
조진균(Jinkyun Cho),김진호(Jinho Kim) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.11
The renewable energy based convergence-integration system have been developed for zero energy buildings and their energy systems especially when generation-consumption variables need to be optimized. However, these methods ignore the interactions between building passive design and active system optimizations. In this study, energy convergence-integration systems coordinated multi renewable energy system and building active system is defined as a computation cost-effective method for stand-alone and grid connected zero energy buildings to effectively consider the interactions between building design and energy system optimizations. This paper provides basic technical information and extend scopes of energy convergence-integration system as well as support policy for zero energy building development in Korea. The aspects include the energy and cost impact as well as the energy matching and the convergence-integration system interactions.
사무소 건물의 HVAC&R 시스템 에너지 분석방법 및 예측 프로그램 개발
조진균(Jinkyun Cho),신승호(Seungho Shin),김종헌(Jonghurn Kim),황동곤(Dongkon Hwang),홍희기(Hiki Hong) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.7
HVAC&R systems are the most energy consuming building services, representing approximately half of the final energy use in the building sector. Despite their significant energy use, there is a lack of a consistent and homogeneous framework to efficiently guide research. This research is about the energy consumptions of HVAC&R systems, with the aim of establishing a common idea for the analysis of building energy efficiency. Our approach deals with the concept of an HVAC&R set that is composed of subsystems. A matrix combination evaluation is examined, and a total of 960 sets can be implemented in a large scale office building. A method as a tool for energy evaluations of HVAC&R systems, and HEET as a energy simulation program, were developed.
사무소 건물의 HVAC&R 시스템 공사비 분석방법 및 예측에 관한 연구
조진균(Jinkyun Cho),신승호(Seungho Shin),김종헌(Jonghurn Kim) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.3
HVAC&R system costs can often be one of the most expensive components, representing approximately 15% of the total construction cost for office buildings. Despite their significant importance, there is a lack of a consistent and homogeneous framework to approximate the estimate research. This research deals with the prediction methodology of HVAC&R system cost with the aim of establishing a common idea for the analysis of the construction cost estimate. Our approach deals with the concept of an HVAC&R set that is composed of subsystems. The matrix combination analysis is examined, and total 960 HVAC&R system cost estimation can be implemented to large scale office buildings.