A great trick to instantly make the fan cooler is very simple

Author：策划人  Source：本站  Time：8/29/2025 10:42:51 PM  

Can fans actually never cool down?Before revealing the correct usage of fans, let's first talk about the cooling principle of fans.I don't know if you have ever thought about a question: Air conditioning transfers heat from the room to the outside through the operation of refrigerant and compressor, which can be said to effectively blow out cold air. But ordinary fans seem to only deliver wind to you, and the temperature of the air before and after the fan does not change. So why does blowing an ordinary fan make people feel cool?The principle is actually very simple, and can be summarized using the knowledge learned in junior high school: evaporation heat absorption refrigeration.This method of blowing a fan is actually "incorrect". Firstly, increasing the gas flow rate can accelerate the evaporation of water (sweat), and the process of water evaporation can effectively remove the heat from the surface of the body.In daily life, the body temperature of the human body is generally higher than the surrounding temperature, so under normal circumstances, our body releases heat to the surroundings, and the air close to the skin is also "heated".If the air flow is poor, the temperature difference between the air near the skin and the body decreases after being "heated" by the body, and the heat convection will also weaken, making it more difficult for the heat on the surface of the body to be transferred. And electric fans can make the air flow, taking away the relatively hot air on the surface of the skin, making the heat convection between the skin and the air smoother, so we feel cool.That is to say, the fan did not lower the temperature, it only lowered our perceived temperature through air flow. In fact, by utilizing this feature of the fan, we can reduce air conditioning electricity bills.For example, the US Department of Energy recommends turning on the electric fan while the air conditioner is on, which can lower your perceived temperature by about 2 ℃. In this way, the air conditioning temperature can be slightly raised.Only a regular fan can achieve "cooling". In fact, a fan does not necessarily need to be paired with an air conditioner to cool down. As long as the fan is placed in the right position, it can have an unexpected effect - blowing the fan head outward towards the window.A netizen experiment found that when the electric fan is 0.5-2.1 meters away from the window, the indoor ventilation effect will be significantly improved. The picture is taken from a video by netizen Matthias random stuff. This is because when the fan is blowing, the air flow around the fan is relatively fast. According to the Bernoulli effect, high flow rate and low pressure will cause gas in other parts of the room to move in this direction. If a window can be opened on the other side (even if it's not directly opposite), the cool air outside will quickly replenish, which can quickly cool down the entire room.This method of updating indoor air can not only help cool down the room at night, but also provide assistance to firefighters at the scene of a fire. For example, the "negative pressure ventilation method" used by the Ottawa Fire and Rescue Service to deal with fire smoke is to use a similar method, blowing air outwards from a certain opening in the room to quickly evacuate the smoke in the room.If there is no fan, using water flow can also achieve a similar effect. Of course, this method of inviting cold air into the house is only suitable for situations where the outdoor temperature is lower than the indoor temperature.Air conditioning fan=air conditioning fan?Since we are talking about the combination of air conditioning fans, let's also talk about air conditioning fans here. There are many types of air conditioning fans (or cold air fans) on the market. Can these fans really have a cooling effect?Firstly, it can be confirmed that they can indeed cool, but the cooling method is relatively simple and crude - the majority of air conditioning fans use water and "ice crystals" added in front of the fan to blow cool air into the room through the fan to help cool down.