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AHU 이코노마이저 고장 예측 및 진단을 위한 고장 유형별 운전 특성 분석
김철호(Chulho Kim),이영준(Youngjun Lee),김태영(Taeyoung Kim),이광호(Kwangho Lee) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
In order to develop a fault detection and diagnosis algorithm for AHU based on machine learning, different types of economizer failures were modeled. Through the EnergyPlus program, the AHU damper closing and sticking, the error of the outside temperature and ventilation temperature sensors, and the setpoint error of the economizer controller were modeled. The distribution of abnormal supply, mixed and return temperature produced by the fault at the control point of the economizer was reviewed. According to the failure phenomenon of each type of economizer, it will not be utilized in conditions where air is introduced during cooling or it will introduce more hot air than the indoor temperature. In addition, changes in the zone air temperature and mixed temperature due to economizer error appeared. In the future, we plan to analyze energy performance, thermal comfort, and indoor air quality according to various failure phenomena of economizers, and develop AHU economizer failure detection and diagnosis algorithms through machine learning.
이코노마이저시스템의 제어 방법 및 설정 변화에 따른 운전 성능 평가
성남철,홍구표 한국건축친환경설비학회 2022 한국건축친환경설비학회 논문집 Vol.16 No.1
The economizer system may reduce cooling energy consumption by control the introduction of outside air. When controlling this system, the rate of outside air introduction is determined according to the introduction criteria and setpoints of outside air, and the operating performance varies. Therefore, in this study, the operation time and energy consumption were compared when the economizer system was controlled in four method: Fixed Dry Bulb Control, Different Dry Bulb Control, Fixed Enthalpy Control, and Differential Enthalpy Control. As a result, the operating time of the system also increased as the maximum limit value increased, but the operating time and energy consumption were not proportional. When the Maximum Limit was fixed, the energy consumption was the lowest when the Dry Bulb Temperature was 22°C, and when the Maximum Limit Enthalpy was 58.0 kJ/kg, the energy consumption was the lowest. The economizer system can save energy from at least 13.47% to 15.84% for each control method, and Differential Enthalpy Control has the largest energy saving among the control methods. Enthalpy control is more effective in reducing energy consumption thandry bulb temperature control.
시뮬레이션을 통한 사무소 건물의 이코노마이저 방식별 성능평가
최보은(Choi, Bo-Eun),김효준(Kim, Hyo-Jun),조영흠(Cho, Young-Hum) 한국건축친환경설비학회 2015 한국건축친환경설비학회 논문집 Vol.9 No.3
Korea determined medium-term reduction of greenhouse gas emissions by 30% in comparison with BAU(Business As Usual). In order to achieve the objective, prepared with sectoral, industrial and annual goals. The building sector is progressing many promotion strategies and projects to achieve reduction goal by 26.9%. The building sector account for 18.2% of the total energy consumption, cooling and heating energy is the most consumed. Therefore many efforts is progressing to reduce cooling and heating energy. In case of non-residential building a lot of cooling load, it is important to design energy saving HVAC system. Economizer is one of energy saving method for HVAC system. The purpose of this study is a comparative study the energy consumptions using a simulation program(Energy plus) for each type of Economizer.
이코노마이저 시스템의 급기 온도에 따른 에너지 절감효과 분석
이진현(Lee, Jin-Hyun),김효준(Kim, Hyo-Jun),조현(Cho, Hyun),조영흠(Cho, Young-Hum) 한국건축친환경설비학회 2017 한국건축친환경설비학회 논문집 Vol.11 No.5
The economizer is one of the energy saving methods through the operation of HVAC system. When the economizer is applied, the energy is saved as compared with the case without it. Currently, it is suggested as a recommendation of the energy saving design standard of the building, which is a domestic regulation. However, In Korea, it is not applied universally compared to other countries and it is applied to some skyscrapers but it is not operated properly because it is not operated or operated passively by manager"s experience. The conventional control method of the economizer system presented the supply air temperature constantly, but it is considered that additional energy saving is possible compared with the previous control method as the supply air condition is changed according to the load condition. Therefore, in this study, we evaluated the energy saving effect by changing the supply air temperature according to the outdoor condition in the economizer dry bulb temperature and enthalpy control method of CAV and VAV systems. For this, BIN method was used and the cooling, fan, and heating energy were analyzed. Based on the results, the supply air temperature according to the outside temperature was derived. The derived supply air temperature methods and the existing economizer control methods were analysed by evaluating the energy. As a result, it was confirmed that both the dry-bulb and enthalpy economizer can save energy compared to the existing method in CAV and VAV systems.
배기가스 이코노마이저의 성능개선을 위한 Soot Blow 시스템에 관한 연구
김홍렬,김부기 한국기계기술학회 2023 한국기계기술학회지 Vol.25 No.6
In this study, a condensate drain valve was newly installed in the steam inlet pipe line of the soot blower to reduce the amount of condensate contained in the steam for the soot blower. When the economizer is inactive, the condensate drain valve on the soot blower steam inlet pipe line is always opened to drain the condensate. It is intended to reduce environmental pollution and improve economizer performance by reducing the water hammer that inevitably occurs in facilities using steam, and reducing the amount of condensate water generated during the shutdown of the soot blower and the release of soot containing condensate water into the atmosphere when removing soot.