Numerical investigation on effect of a novel emergency cooling system on thermal environment of data rooms

This study proposes a novel emergency cooling system in which the liquid nitrogen is used as the heat exchange medium. The impact of the system on the thermal environment of data rooms is analysed by numerical simulation. Results show that if no backup cold source is settled, the inner temperature of the cabin would peak at 55 ℃, which is the allowed upper limit, in 387 s after the cooling system failed, meanwhile, the room air temperature would reach the upper limitation of 40 ℃ in 600 s. On the contrary, if the emergency cooling system is turned on at 360 s after the failure of the conventional air conditioning system, the maximum indoor temperature and internal temperature of cabin are 33.8 ℃ and 54.1 ℃, respectively. After that, both the indoor temperature and velocity fields are gradually uniformly distributed, thus it is the optimal turn-on time of the emergency cooling system.