System for reducing machine room temperature

The invention provides a system for reducing machine room temperature. The system comprises an air conditioner, a return air channel, an outdoor air channel, a heat transfer plate and a controller. The return air channel is used for enabling hot air in a machine room to flow back to the air conditioner. The outdoor air channel is used for enabling outdoor air to circulate in the outdoor air channel. The heat transfer plate is arranged between the return air channel and the outdoor air channel, and carries out heat exchange on the hot air in the return air channel and the outdoor air in the outdoor air channel. The controller is used for controlling the air conditioner to carry out refrigeration according to a preset condition. According to the system, the machine room temperature is reduced, the cooling load of the machine room is reduced, mechanical refrigeration operating time is shortened, the total energy consumption of a data center is reduced, and the energy saving effect is obvious.