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김태호(Tae-Ho Kim),유성연(Seong-Yeon Yoo),김명호(Myung-Ho Kim) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.2
The purpose of this study is to develop a control algorithm for outdoor air cooling based on the prediction of cooling load, and to evaluate the building energy saving using outdoor air cooling. Outdoor air conditions such as temperature, humidity, and solar insolation are predicted using forecasted information provided by the meteorological agency, and the building cooling load is predicted from the obtained outdoor air conditions and building characteristics. The air flow rate induced by outdoor air is determined by considering the predicted cooling loads. To evaluate the energy saving, the benchmark building is modeled and simulated using the TRNSYS program. Energy saving by outdoor air cooling using load prediction is found to be around 10% of the total cooling coil load in all locations of Korea. As the allowable minimum indoor temperature is decreased, the total energy saving is increased and approaches close to that of the conventional enthalpy control.
김민용(Min-Yong Kim),김영일(Young Il Kim),정광섭(Kwang-Seop Chung) 한국지열·수열에너지학회 2011 한국지열에너지학회논문집 Vol.7 No.1
Due to enhanced sealing and insulation of buildings, extensive use of glasses for building envelopes and increased use of heat generating office equipments, energy consumption of modern buildings for cooling is steadily increasing. With outdoor air cooling(ODAC) system, cooling load can be reduced by exchanging indoor air with the cold outdoor air during spring and fall seasons. If ODAC is operated based only on temperature, total cooling load may virtually increase if the outdoor humidity is high. To overcome this problem, ODAC should be controlled based on enthalpy. In this work energy saving characteristics of enthalpy controlled ODAC is studied using dynamic simulation. The result shows that cooling load can be reduced by 27% by adopting ODAC.
동특성 시뮬레이션 이용 엔탈피 제어 외기냉방의 에너지 절약 특성 연구
김민용(Min-Yong Kim),김영일(Youngil Kim),정광섭(Kwang-Seop Chung) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
Due to enhanced sealing and insulation of buildings, extensive use of glasses for building envelopes and increased use of heat generating office equipments, energy consumption of modern buildings for cooling is steadily increasing. With outdoor air cooling(ODAC) system, cooling load can be reduced by exchanging indoor air with the cold outdoor air during spring and fall seasons. If ODAC is operated based only on temperature, total cooling load may virtually increase if the outdoor humidity is high. To overcome this problem, ODAC should be controlled based on enthalpy. In this work energy saving characteristics of enthalpy controlled ODAC is studied using dynamic simulation. The result shows that cooling load can be reduced by 10% by adopting ODAC.
초고층 주거용 건물에서 폐열회수형 환기시스템을 이용한 외기냉방 적용성 평가
성남철(Seong, Nam Chul),홍성민(Hong, Sung-Min),최성균(Choi, Sung-Kyun),윤동원(Yoon, Dong-Won),오석훈(Oh, Suk-Hoon) 한국건축친환경설비학회 2012 한국건축친환경설비학회 학술발표대회 논문집 Vol.2012 No.10
Outdoor Air Cooling offers a variety benefit as to decrease outdoor air loads and cooling energy consumptions. This study conduct in to establish outdoor air intake control strategy and to analyze cooling demand period in the high-rise residential buildings for evaluation of applicability of outdoor air cooling using the heat recovery ventilation system. As a result of simulation, approximately, applied outdoor air cooling control, cooling demand period decreases 12 percent during one year.
구체축열시스템과 외기전담공조시스템이 통합 적용된 오피스건물에서 냉방에너지 소비량 특성
이윤선,이겨레,임재한 한국건축친환경설비학회 2019 한국건축친환경설비학회 논문집 Vol.13 No.2
Thermally activated building system (TABS) has been regarded as one promising technology for energy saving and green-house gas reduction due to the efficiency improvement of a cooling/heating equipment, and feasibility of combining other promising technologies such as ground source heat pumps or cooling towers. TABS can be achieved by running hot/cold water through pipes embedded in a building’s construction. Compared to conventional HVAC systems, TABS delivers higher water temperatures for cooling, and lower water temperatures for heating due to large heat exchange areas. Furthermore, water systems have less transport energy and ductwork spaces compared to existing air systems, due to high thermal capacitance of water. Because of the surface condensation problems in hot and humid weather conditions, TABS needs to be integrated with dehumidification system such as variable air volume (VAV) system or dedicated outdoor air system (DOAS). This study aims to evaluate the cooling energy consumption characteristics of thermally activated building system (TABS) integrated with DOAS in office building compared to the TABS with VAV system. In this study, the design cooling load in office building was firstly evaluated and indoor thermal environment was discussed by considering the surface condensation risk. Finally the cooling energy consumption of TABS with DOAS was compared with TABS and VAV system operation. When the total cooling energy consumption during the cooling period is compared, it is found that the integrated operation of TABS with DOAS is 24% more energy-efficient than integrated operation of TABS with VAV. Night-time electric energy consumption accounts for 34% of the total cooling energy consumption.
황지현(JiHyun Hwang),송두삼(Doosam Song),이태원(Taewon Lee) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.11
Recently electric power consumption at data center has been increasing very steeply with the rapid spread of internet network and a fast evolution of information and communication technologies. Outdoor air cooling system could be used for cooling the indoor space with relatively cold outdoor air which led to save cooling energy and cost. It was considered in this study how the outdoor air cooling system could be introduced to minimize the cooling energy in the typical data center. It was analyzed BEMS data for one year from the outdoor air cooling system installed at the domestic data center. And it was to verify the economic effect. When you raise the indoor temperature setting 1 ℃, confirmed that the annual energy savings of approximately 5%.
데이터센터 외기냉방시스템 설치에 따른 에너지절감 효과 분석
황지현(Ji-Hyun Hwang),이태원(Tea-Won Lee) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
Recently electric power consumption at data center has been increasing very steeply with the rapid spread of internet network and a fast evolution of information and communication technologies. Outdoor air cooling system could be used for cooling the indoor space with relatively cold outdoor air which led to save cooling energy and cost. It was considered in this study how the outdoor air cooling system could be introduced to minimize the cooling energy in the typical data center. The numerical analyses were carried out on the energy consumption in data center with several models for outdoor air temperature and so on. The results were also compared with experimental values obtained from the outdoor air cooling system installed at the domestic data center. It was estimated that about 50 percent of electric energy was possible to save annually with introducing the outdoor air cooling system at data center.
황지현(JiHyun Hwang),이태원(Taewon Lee) 대한설비공학회 2020 설비공학 논문집 Vol.32 No.4
Because of the recent expansion of the Internet network and the rapid development of information and communication technology, the number of data centers and the power consumption are expected to increase rapidly. However, these data centers consume large amounts of electric power year round, regardless of working days or holidays, so energy saving at these facilities becomes crucial. Numerical analysis was conducted in this study with the change of various variables to examine and analyze the effects of various design and operating conditions on the outdoor air cooling system and to derive operating plans to minimize electric power consumption through introduction of outside air to the computer room. When designing the system, it is desirable to select the optimal air flow considering the heat generation by computer equipment, the efficiency of the fan, and the performance of the refrigerator and so on, rather than the theoretical maximum outdoor air flow. Compared with the results of a conventional cooling system with only refrigerators, it was confirmed that the introduction of an outside air cooling system could yield energy saving by more than 40% yearly.
현장성능시험에 의한 외기전용과 냉각식 + 재열 공조기의 운전비 비교
김영일(Young II Kim),김정민(Jung-Min Kim),정광섭(Kwang-Seop Chung),박승태(Seung-Tae Park) 한국지열·수열에너지학회 2011 한국지열에너지학회논문집 Vol.7 No.2
Dedicated outdoor air(DOA) system which conditions the outdoor air separately is superior to conventional cooling +reheating system with respect to energy consumption and indoor comfort. Since the sensible and latent load characteristics of indoor and outdoor are different, it is more efficient to treat them separately. In this study, cycle analysis and on-site performance test of DOA system have been conducted. The study shows that DOA requires 50% less equivalent energy than the conventional system. The on-site performance test of a prototype shows that the coefficient of performance(COP) of the DOA system is 37% higher than the conventional system.