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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.
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.