Abstract: In direct aircooling unit, the backpressure is higher; the cooling capability of the condenser is affected greatly by external environment. In summer, when the dry bulb temperature is higher, the higher wind speed and higher temperature influence on the fans and the radiators, and their efficiency will reduce; the generation efficiency of the unit will be affected. Based on analysis, it was considered that to adopt some measures, such as to increase the unit fully generating backpressure, to configure the cooling area of aircooling system rationally, to stop the high pressure heater without accident, to spray water mist on external surface of the radiators and others, can increase the ability to spend summer of the direct aircooling unit; which is helpful for ensuring the power grid safety and full generation of the turbine, and the generation efficiency of the unit will be raised.

Key words: air-cooled unit, summer high temperature, direct air cooling, power generating with full load, ability to spend summer, analysis