4hw.com.cn: in the hot summer, many driving friends often drive the air conditioner to sleep, but in order to be cool for a while, I don't know that it's dangerous or even possible to pay the cost of life. What's the harm of turning on the air conditioner to sleep in summer? Let's have a look.
Why is it dangerous?
First of all, talk about the situation in the sealed garage. In the garage, carbon monoxide is the main cause of the death of car owners. We all know that when the gasoline engine is working, it needs to burn gasoline, while when the gasoline engine is burning, it needs a lot of oxygen. In an ideal state, when a kilogram of gasoline is burned completely, about 15 kilograms of air will be consumed. If calculated by volume ratio, it is about 1:9000. Simply speaking, 9000 liters (9 cubic meters) of air must be inhaled to burn 1 liter of gasoline. When you turn on the air conditioner, the air consumption will increase by 20%. In a calm state, an adult needs 250 ml of oxygen per minute, that is to say, 5 L of air needs to be inhaled for gas exchange in the lungs. Of course, if gasoline does not get enough oxygen, it will not burn completely and carbon monoxide will be produced.
The risk of carbon monoxide
Carbon monoxide and hemoglobin in the blood are combined 250 times faster than oxygen. If carbon monoxide enters the blood circulation through the respiratory tract, it will generate carboxyhemoglobin after affinity with hemoglobin, which will weaken the function of blood to deliver oxygen to various tissues, endanger the central nervous system of the human body, cause functional obstacles such as feeling, reaction, understanding and memory of the human body, and seriously endanger the blood circulation system Danger to life. When the concentration is not high, people will feel headache, dizziness, dizziness, nausea, dyspnea and so on. If the concentration rises sharply, people will die of asphyxia due to brain hypoxia immediately.
Some people will ask, 'since carbon monoxide is outside the car, why do you have a car with good sealing performance? '。 In fact, we need to understand that no matter how well sealed the car is, it will not be completely sealed. Although the car of different grades and brands has different tightness, it is still not fully sealed, but the tightness is different. There are ventilation holes in the four corners of the car. These holes are to prevent our eardrum from discomfort when closing the door. In fact, this is well understood. As long as the car falls into the water, the water will enter the car. Since water can enter the car, carbon monoxide can also enter.
Once a reporter did an experiment. He parked a car in the paint baking room of the car shop, turned on the air conditioner of the car and kept it in the external circulation state, closed the doors and windows of the car, and used the carbon monoxide detector to detect the carbon monoxide content in the car at different times. At the beginning, the concentration of carbon monoxide in the car is 0 ppm, and the temperature in the car is about 20 ℃; one minute later, the concentration of carbon monoxide in the car is 5 ppm; five minutes later, the concentration of carbon monoxide in the car is 65 ppm; 15 minutes later, the concentration of carbon monoxide in the car is 70 ppm; 25 minutes later, the concentration of carbon monoxide in the car is 91 ppm, at this time, the warning light of the detector flickers and alarms constantly, and people enter the car A minute later, it's not comfortable.
Then, let's talk about the outdoor situation. There are two modes of car air conditioning, one is internal circulation: the air inside the car circulates by itself, and the external air will not blow into the car interior. The other is external circulation: the air outside the car can continuously enter the interior of the car to keep the air inside the car fresh. We all know that when we breathe normally, we absorb oxygen and exhale carbon dioxide. The space in the car is narrow, but there is a lot of oxygen in the car. In addition, the air conditioning in summer is generally internal circulation (because the refrigeration effect is the best). The oxygen is reduced while the carbon dioxide is higher and higher. If you sleep, it is easy to be poisoned by carbon dioxide.
Therefore, in summer, don't hurt yourself for the sake of a moment's coolness. If you are really sleepy, you can park your car in an open place. When the air conditioner is on, you should also leave a little space in the window, which can remove the carbon dioxide in the car, and the sleeping time should not be too long.