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Cho, Sang-Hyeon,Park, Joon-Young,Jeong, Jae-Weon Council on Tall Building and Urban Habitat Korea 2017 International journal of high-rise buildings Vol.6 No.1
The objective of this study is to determine the effectiveness of a modified air-side economizer in improving indoor air quality (IAQ). An air-side economizer, which uses all outdoor air for cooling, affects the building's IAQ depending on the outside air quality and can significantly affect the occupants' health, leading to respiratory and heart disease. The Air Quality Index (AQI), developed by the US Environmental Protection Agency (US EPA), measures air contaminants that adversely affect human beings: PM10, PM2.5, SO2, NO2, O3, and CO. In this study, AQI is applied as a control for the operation of an air-side economizer. The simulation is analyzed, comparing the results between the differential enthalpy economizer and AQI-modified economizer. The results confirm that an AQI-modified economizer has a positive effect on IAQ. Compared to the operating differential enthalpy economizer, energy increase in an operating AQI-modified economizer is 0.65% in Shanghai and 0.8% in Seoul.
외기냉방시스템이 적용된 데이터센터 CRAH의 급기온도와 설계 풍량에 따른 에너지성능 분석
김지혜,엄태윤,정차수 대한건축학회 2019 大韓建築學會論文集 : 構造系 Vol.35 No.11
The purpose of this study is to evaluate the cooling energy saving effects of CRAH supply air temperature(SAT) and design flow ratechanges when applying air-side economizer in the data center. MLC(Mechanical Load Component), which is cooling performance indicator ofdata center, was used to assess the effectiveness of cooling energy savings. It was computed with energy simulation (DesignBuilder) toevaluate the cooling energy performance of 8 different alternatives in a data center. The MLC was 0.31~0.32 regardless of CRAH supplytemperature without air-side economizer, and 0.15 to 0.19 value with air-side economizer. That is, cooling energy can be reduced byapproximately 40~55% when applying economizer. As the CRAH SAT and design flow rate changed, the MLC values were 0.16 to 0.18 and0.15 to 0.19, respectively. 본 연구에서는 데이터센터를 대상으로 CRAH의 급기온도와 설계풍량 변화에 따른 외기냉방의 에너지 절감효과를 시뮬레이션을 통해 평가하였다. 냉방에너지 절감효과는 데이터센터 냉방 성능지표인 MLC를 활용하여 대안간 비교 평가하였다. 시뮬레이션 결과, 외기냉방이 적용되지 않은 경우의 MLC는 급기온도와 관계없이 0.31~0.32이었고, 외기냉방이 적용된 경우의 MLC는 급기온도에 따라 0.16~0.18, 설계풍량에 따라 0.15~0.19로 나타났다. MLC 결과를 바탕으로 계산한 외기냉방의 에너지 절감율은 약 40~55%이다.
Water-side economizer의 Free cooling 운전 기간 확대를 위한 냉각탑 Fan 풍량 제어에 관한 연구
김유진,송영학,김환용 한국건축친환경설비학회 2023 한국건축친환경설비학회 논문집 Vol.17 No.3
Recently, various strategies have been proposed to reduce energy of Water-side economizer (WSE), and in particular, due to the increase in the construction of data centers, many studies have been conducted to reduce cooling energy. Therefore, in this study, a strategy to expand full-free cooling according to the decrease in the cooling tower outlet temperature of the cooling tower was established by increasing the cooling tower air volume for the WSE system. In addition simulation calculations were performed to analyze the effectiveness of the strategy to analyze the energy savings. According to the simulation calculation of the cooling tower fan air volume at intervals of 5% in the range of 50% ~ 100%, the energy was saved from 100% to 22.4% compared to the cooling tower fan ratio of 50%, during the representative week of partial load, a total of 100 hours of full-free cooling operation time was increased. Therefore, in order to implement the efficient operation of the WSE system, it is necessary to first consider increasing the cooling tower fan air volume as much as possible.
데이터센터에 적용된 외기도입 냉방시스템에서 필터유형별 에너지 소비량 변화
박성현(Seonghyun Park),서장후(Janghoo Seo),정용호(Yong-Ho Jung),장현재(Hyun-Jae Chang),황석호(Seok-Ho Hwang) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.7
Recently, many studies related to reducing the energy consumption in data centers have been conducted. These studies have mainly focused on the air intake and exhaust system of a computer room air handling unit (CRAH) in the server room, diffuser type, suppression and discharge of the heat generated from the server, and the air-side economizer system. In this study, the energy consumption of the conventional central chilled water cooling system is compared with the energy consumption of the air-side economizer system. We also examined how changes of differential pressure by each filter have influenced energy consumption, using the power usage effectiveness (PUE). Results show that the PUE was improved, and energy consumption decreased, by applying the air-side economizer system.
데이터센터의 외기도입 냉방시스템 적용에 따른 경제성 평가
박성현(Seonghyun Park),서장후(Janghoo Seo) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.4
Many studies are being conducted with the aim of reducing the energy consumption in data centers, which are one of the highest consumers of energy. The use of an air-side economizer system that uses external air during intermediate and winter seasons is being considered for reducing the energy consumption of air conditioners. In this study, using the energy simulation, we evaluated the energy performance of a central chilled water cooling system and air-side economizer system in domestic data centers. Further, the cost-effectiveness of the air-side economizer was analyzed through Life-Cycle Cost Analysis. The results showed that with the use of air-side economizer systems, the energy costs increased as the applied filter grade increased; however, unlike existing central chilled water systems, it would break even within 2 years.
박성현(Park Seong-Hyun),서장후(Seo Jang-Hoo) 한국태양에너지학회 2013 한국태양에너지학회 학술대회논문집 Vol.2013 No.11
The rapid growth of data center industry has led to the vast increase in power consumption of server equipments in the data center which is operated for 365 days. Cooling power consumption for removal of heat load of server apparatuses has increased also. In this study, energy consumption is analyzed by TRNSYS simulation for domestic data center. We have also conducted the economic evaluation using Life Cycle Cost(LCC) method based on air-side economizer system adoptability. As a result, when applied a air-side economizer system, break-even point is made at most 1 years compared to central chilled water cooling system.
Energy saving potential of various air-side economizers in a modular data center
Ham, S.W.,Kim, M.H.,Choi, B.N.,Jeong, J.W. Applied Science Publishers 2015 APPLIED ENERGY Vol.138 No.-
With the recent development of the IT technology, the demand for data centers has significantly increased, and modular data centers have attracted considerable attention because of their excellent stability, scalability, and economic feasibility. This research quantitatively analyzed the applicability of various air-side economizers and their energy-saving potential in modular data centers. A detailed cooling load estimation process was established for modular data centers, and annual cooling energy simulations were carried out using various air-side economizers. The various air-side economizers yielded cooling coil load savings of 76-99% in comparison to conventional cooling systems in data centers, and the total cooling energy savings of the economizers ranged from 47.5% to 67.2%. Indirect air-side economizers with high-effectiveness heat exchangers were found to yield significant energy saving (63.6%) and have simple system configurations.
고밀도 내부부하 중심 건물의 에너지 절약적 공조방식에 대한 연구
조진균(Jin-Kyun Cho),정차수(Cha-Su Jeong),김병선(Byung-Seon Kim) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.8
With the advancement of technology, the density of IT equipment, heat load and power consumption continue to increase in high density internal-load dominated buildings as datacenters. To improve the HVAC system’s energy performance and efficiency, there is a need to find methods of using outside air. Through cooling tower control that is based on outside wet-bulb temperature, the water-side economizer made it possible to achieve a maximum energy performance improvement of about 16.6% over the basic chilled water system, whereas the air-side economizer, through control based on outdoor air enthalpy, made it possible to achieve about 42.4% improvement.