Abstract
Air conditioning systems in data cxalters must be operated year-round due to the exteremly large amount ofheat emitted from the ICT devices. In order to decrease annual energy consumption, it is important to wisely use low temperature outdoor air during the winter from the mid term. In this study, the reduction effect of the power consumption ofeach outside air cooling system was compared by the simulation. And the risk assessment at the time of outside air cooling is also performed.
