Journal of Korean Institute of Architectural Sustainable Environment and Building Systems ISSN:1976-6483(Print) 2586-0666(Online) 한국건축친환경설비학회논문집

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.