Figure 1: A fan bring cold air.
In summer, in some specific places, or some economically constrained families, people have no air conditioning but only fans. When it’s especially hot, some people find that the fan wind gets hotter and hotter, which can't cool at all. What's going on?And how to let the electric fan blow cold air?
Figure 2: A fan is blowing hot wind.
The fan is different from the air conditioner for it can heat itself. The motor heats up after the fan has been used for a long time, and the air around it also begins to heat up. When these air is blown out, people naturally feel that the wind is hot. Moreover, the ambient temperature itself is also very high because of summer.
Usually, people who blown by the fan will be cool because of the evaporation and heat dissipation of body water or sweat. But if a person keeps blowing against the electric fan until the moisture in his skin evaporates, so it doesn't absorb heat when he doesn't have it.And then the more he is blown, the hotter he gets.
Figure 3: Spray some cold water on the fan blades.
1. Wipe the floor with wet mop indoors and turn on the fan to evaporate and absorb heat.
2. Put a basin of cold water (preferably ice) in front of the fan, which can not only reduce the room temperature but also increase the humidity of the air.
3. Spray some cold water on the fan blades. When the electric fan is blowing, the wind with cold water will naturally be cooler.
4. Find a towel to soak it and put it in front of it, and then turn on the fan. The hot air will turn cool instantly. You can also hang a wet towel in front of the window. as long as there is wind. The effect is the same. Or you can use other liquids, such as diluted perfume, toilet water, etc. When the wind blows, the air velocity on the surface of the liquid speeds up and the liquid will accelerate evaporation. The liquid evaporation absorbs heat from the air, so the temperature will decrease.
1. Open and close the doors and windows at the right time
Open doors and windows for ventilation when it is cool in the morning and evening to increase the flow of air and reduce the indoor temperature. During the day, especially at noon, closing the doors and windows can isolate the invasion of outdoor hot air. And curtains with light color can block the sun and reflect heat radiation. This will make the room cooler.
Figure 4: Flowers on the balcony
2. Balcony greening and courtyard greening
Plant grapes, morning glory, wall creepers or any other flowers on the balcony. In this way, the attached wall can be beautiful and it would also be cooled by 5 ℃ ~ 14C. The indoor temperature can also be cooled by 2 ° ℃ ~ 4 ℃. This is because the transpiration of plants pulls the water source in the soil. And the water evaporated through the leaves also requires a lot of energy when the water is transformed from liquid to gaseous. Therefore, the ambient temperature will be reduced.
3. Maintain a tidy indoor environment
In summer, if the room is cleaned up, it will make people feel comfortable because there is more space in the room. Do not mess your room which will not only make you feel stuffy and suffocated, but also make you anxious.
4. The roof is directly exposed to the sun, so it is the hottest place. We can sprinkle some water on the roof to let the house dissipate heat taking away the indoor temperature.
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