Maintaining an IAQ with fresh in school building is very important because the good IAQ can keep the student in health and improve the academic performance. Since school buildings are very dense and require a lot of fresh air, the need for ventilation has become obvious. While opening a window does provide fresh air, which is undesirable for the indoor climate and for energy efficiency under severe outdoor condition. ERV (Energy Recovery Ventilation) technology offers an optimal solution: fresh air, better climate control and energy efficiency. However, when the outdoor air condition is favourable to control the indoor environment such as spring and autumn in Korea, heat exchange in ERV would rather increase the cooling load than diminish. Economizer cycle control which using the outdoor air in controlling the indoor thermal environment has many benefit in terms of energy saving and IAQ control.
In this study, the ERV with outdoor air cooling mode is suggested. And then the system control characteristics and energy saving effect were analyzed using the simulation method.