Abstract
Energy use by buildings accounts for about 36% of the overall energy consumptions. Energy recovery ventilator (ERV) system help to offer optimal solutions.: fresh air, better climate control, and energy efficiency. However, when outdoor air conditions are favorable to the control of the indoor environment, such as in spring and autumn in Korea, heat exchange in ERV increases energy consumption instead of decreasing it. When the heat exchange is unnecessary, there is a need for using by-pass control, which directly induces outdoor air without passing through a heat exchanging device. Therefore, this study was carried out with simulations using EnergyPlus v.9.3.0 for the various types of ERV with by-pass controls. From the result of simulations for the proper operating control method of ERV, it was found that using heat-exchange mode in the heating season and using bypass mode in both the intermediate season and a part of cooling season provided the largest energy savings. The results also showed that adopting this method in weather conditions in Incheon saved 15.3~20.4% energy as compared to using a VAV system. Also, the results show by-pass time ratio in the intermediate season is higher than those of partial cooling season and heating season.
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