Electric fan blowing, just speed up the flow of air, does not change the air temperature. Of course, the air temperature blowing to the human body will not change, the reason why the human body feels cool is to speed up the flow of air around the human body, which can speed up the evaporation of sweat on the human body, accelerate the heat absorption from the human body, and reduce the skin temperature.
If the window is opened, indoor and outdoor air will be exchanged, and the electric fan will not only blow indoor air, but also exchange outdoor air into the room. The outdoor air temperature should be higher than the original indoor air temperature, and may even be higher than the human body temperature. When such air is blown to the human body, it not only does not absorb heat from the human body, but also emits heat to the human body. Although the increase in temperature will accelerate the evaporation of sweat, more heat absorbed by evaporation will come from the hot air, and less heat absorbed from the body. Therefore, opening the window will be hotter than closing the window and blowing the electric fan.
No, but it can adjust the local circulation, so that the man-made wind regulator, the fan can not open the doors and Windows when the indoor area is large and in the place where there is no wind can reduce and dehumidifying the hot situation, accelerate the heat process of people or things, so the door and window can not cool down but can adjust the local temperature, do not believe to use a thermometer to try.
For a short time, yes. But the air doesn't circulate