Can the exposed car be directly drenched to cool down?

Can the exposed car be directly drenched to cool down?

As we all know, vehicles have become an important means of transportation in our daily life. In fact, we will encounter many problems when the vehicle is driving, such as exposure to the sun. Can the following exposed vehicles be directly drenched to cool down?

Can the car be directly drenched to cool down? It is not advisable to splash water to cool the car after exposure. The following is a detailed introduction: 1. Harm of cooling water: the metal parts in the car have the characteristics of thermal expansion and cold contraction. After exposure, the surface temperature of car paint is very high. At this time, if washed, the paint surface will be easily damaged, and paint peeling may occur. 2. Correct cooling method: Before driving, check whether enough cooling water is added, check whether the thermostat is normal, and always pay attention to the indicating reading of the water thermometer during driving, which cannot exceed 95℃. When the temperature is too high, in order to strengthen the convection of cooling air, the range hood can be lifted to facilitate ventilation and heat dissipation.

Don't "shower" exposed vehicles with cold water.

It is very necessary to maintain cars in hot weather and cool down to relieve summer heat. The car was exposed to the hot sun for several hours, and as soon as the door opened, a rolling heat wave came. Many people will immediately turn on the air conditioner to cool down at this time, but I don't know that this effect is not only not obvious, but also increases the energy consumption of the car. For example, the widely circulated method of spraying water into the car to cool down is also not effective.

During the test, if tap water is sprayed into the car with a sprayer for half a minute without opening the doors and windows, the mercury column of the thermometer has not changed, and the high temperature in the car still shows 39℃. But because of the water spray, the car is stuffy except for the heat. Other car owners like to spray cold water on the surface of their cars to cool them. In fact, this method is the least desirable.

The maintenance master said that the car after exposure can't be "showered" with cold water, just as people shouldn't take a shower with cold water immediately after strenuous exercise. Automobile metal parts also have the characteristics of thermal expansion and cold contraction. After the vehicle is exposed to the sun, the paint temperature is as high as 70℃ or even higher.

At this time, spraying vehicles with cold water will easily lead to paint damage and paint peeling. And you can't use cold water to cool down after driving at high speed. Because the temperature of the engine and tire is too high at this time, splashing cold water will directly affect the service life of the engine, and it will also cause the internal structure of the tire to deform differently between the plies in the carcass due to sudden cooling, thus damaging the tire and even causing the plies to peel off.

The maintenance master suggested that when washing the car in summer, you can always clean the water tank and remove the sundries attached to it, so that the engine can dissipate heat more easily. At the same time, when parking, the owner should not only consider the convenience of traffic, but also consider avoiding the problem of the vehicle being exposed to the sun as much as possible, and try to park the car in a cool and ventilated place.

Can the car be directly drenched to cool down? 2 The car is like a steamer after exposure, how to cool down? Beware of five misunderstandings of outdoor parking!

Misunderstanding 1: cold water "shower"

situation

Mr. Wu, the owner of the car, will "bathe" his car with cold water whenever he has the chance. He thinks this is the best way to cool the car under the scorching sun. A person's body is too hot, and the hot air can be dissipated by taking a cold bath, so as long as the temperature inside the car is high and conditions permit, finding cold water to take a cold bath for the car should also be able to wash away the hot air inside the car.

expert opinion/advice

It is no more appropriate to take a cold bath than to take a cold bath immediately after strenuous exercise. Metal parts in automobiles have the characteristics of thermal expansion and cold contraction. After the car paint is exposed to the sun, the surface temperature is very high. At this time, if washed, the paint surface will be easily damaged, and paint peeling may occur.

In addition, you can't pour cold water to cool down after driving at high speed. Because the temperature of the engine and tire is too high at this time, it will directly affect the service life of the engine, and due to sudden cooling, it will inevitably cause changes in the internal structure of the tire, resulting in different deformations between the plies in the carcass, which will damage the tire at an early stage and even lead to the peeling of the plies.

Correct method

Check whether the cooling water is full before driving, check whether the thermostat is normal, and pay attention to the indicating reading of the water thermometer at any time during driving, which cannot exceed 95℃. When the temperature is too high, in order to strengthen the convection of cooling air, the range hood can be lifted to facilitate ventilation and heat dissipation.

Myth 2 alcohol cooling

situation

Miss Liu learned a trick to cool down with alcohol from a friend, that is, mixing medicinal alcohol and water according to the ratio of 1: 10 and putting them in a bottle with a nozzle. Every time the car basks in the sun, I will spray it a few times before driving, and then turn on the air conditioner. This cooling speed is very fast, and the temperature inside the car will drop in just one or two minutes. Alcohol is volatile, which will also accelerate the evaporation of water.

expert opinion/advice

Although this cooling method can play a certain role, there are great security risks. Because alcohol is a flammable liquid after volatilization, because the space inside the car is too small after cooling, the heat displaced is still in the car, and alcohol is easy to attach to the seat. When it reaches a certain concentration and the temperature inside the car is too high, it is easier to spontaneously ignite.

And the quality of alcohol should be considered when spraying alcohol. If the alcohol is unqualified, it will also damage the interior decoration. After spraying, the smell of alcohol in the car is strong. If there is a spot check by the police, there may be misunderstanding of drunk driving. Therefore, car owners are advised not to use this method frequently. When the temperature inside the car is really too high, it is recommended to use special spray cooling products for cars.

Myth 3: Dry ice coolant

situation

Due to the unbearable heat, Mr. Zhu heard that there is a high-tech product called automobile coolant on the market now, so he bought a can, but it suddenly "exploded".

expert opinion/advice

Many special coolants on the market now are not high-tech products. In fact, the main ingredient is dry ice. Dry ice is solid carbon dioxide, often used as a refrigerant, which can absorb the heat in the environment and reduce the surrounding temperature.

However, dry ice is volatile, which will vaporize under the sun and high temperature, releasing gas 1000 times larger than the original solid dry ice. Once the tank can't bear this pressure, it is easy to "explode".

Correct method

When using this automobile coolant, it should be kept away from direct sunlight and above 50℃. It is better to put it under the trunk or seat of the automobile, not next to the windshield, so as to avoid shaking or sun exposure and explosion.

When spraying, you should also be careful not to spray directly on glass and leather goods, so as to avoid the above items from entering water and bursting due to temperature difference.

Myth 4: Remove the air intake grille.

situation

Recently, Mr. Zhou saw many taxis, and the air intake grille in front of them was gone. Later, he found that falling into the grille can play a certain role in heat dissipation.

expert opinion/advice

Theoretically speaking, falling into the air intake grille and the engine floor may play a certain role in the heat dissipation of the engine to a certain extent, but the operability is not very strong. Because the normal working temperature of the engine is about 100 degrees Celsius, the heat dissipation of the engine does not only depend on the forced heat dissipation of the heat dissipation control system. At the same time, when the car is driving, the windward airflow passes through the radiator and the front engine room, which is also one of the ways to dissipate heat.

Myth 5: Remove the thermostat.

situation

Recently, the weather was hot, and Mr. Gong deliberately removed the thermostat of the car, thinking that this could properly lower the water temperature and make the car cooler.

expert opinion/advice

Removing the thermostat can alleviate the phenomenon of high water temperature to some extent, but it is not desirable and scientific. Especially for EFI vehicles, because the thermostat can warm up quickly, if the water temperature is too low, it will increase fuel consumption, aggravate the wear and tear during cold start, affect emissions and reduce engine power.

Because the function of the thermostat is to automatically adjust the amount of water entering the radiator according to the temperature of the coolant, change the circulation range of water to adjust the cooling capacity of the cooling system, and ensure that the engine works in a suitable temperature range.

Tips for cooling in the car

The film can only be attached to the front bumper.

The cockpit is always the sunniest place in the whole car. A lot of ultraviolet rays came in through the window, which made drivers and people sitting in the front row miserable. The only thing that can block the sunshine in front is the explosion-proof membrane. The explosion-proof membrane with excellent quality can effectively insulate heat and block ultraviolet rays, while not blocking the driving sight, and can also reduce the air conditioning load of the automobile and improve fuel efficiency.

[hint]

42% of the heat in the car comes from the front block, and the most obvious ultraviolet radiation is the front block. If the whole car film is too expensive, you can give priority to sticking only the front gear.

Give your car an umbrella.

In the parking state, even if the high-grade thermal insulation film of 10 thousand yuan is attached, the result that the carriage becomes a steamer cannot be put an end to. Therefore, if supplemented by other suitable sunshade products, such as a "sun umbrella" for cars, the cooling effect will be more significant.

There are many kinds of "sun protection umbrellas". For example, the side window can be equipped with a pull-out sunshade, similar to a scroll. When in use, one end can be fixed above the window with the sucker, and the other end can be pulled to the lower edge of the window, which can be quickly rolled up when not in use. But at present, the price of such products on the market is around 20 yuan; You can also buy umbrellas made of aluminum foil. After unfolding, suck it on the front window or rear window with a sucker, which can effectively reflect ultraviolet rays. Prices range from 5 yuan to 30 yuan.

[hint]

Sunscreen, sunshade block this type of "sun umbrella", the material is generally not very particular, the price is also very low, you might as well buy one or two spare. But if you want to buy a car, you should pay more attention. The material has a great influence on the sunscreen and windproof effect.

Can the exposed car be directly drenched to cool down? 3 how to cool the exposed car?

Tip 1: open the driver's door, then close it again, and circulate for many times to quickly exhaust the hot air inside the car to achieve the purpose of cooling down.

If you feel hot air coming on your face just after opening the door, don't worry, roll down the window of the co-pilot first, and then open and close the driver's door. After repeated circulation, the temperature inside the car will slowly drop. Its principle is that internal and external air exchange can be carried out, so that hot air can be discharged from the window. After 10 times, the temperature will drop obviously. But if the temperature outside is high, drive the car to a cooler place before doing so.

Tip 2: Open diagonal windows and skylights to cool the car.

If you are in a hurry, you can open the oblique windows and skylights, inject natural wind while driving, and the car will soon cool down. The principle is that the air entering from the side window and the air entering from the rear window will form convection and quickly spread out from the window, thus achieving the effect of cooling.

Tip 3: Use cooling spray.

If you think the above tips are laborious, you can use cooling spray. Its principle is that the spray is made of dry ice, and after it is sprayed into the air, it absorbs heat and realizes cooling. However, when in use, attention should be paid to opening the window in time to discharge carbon dioxide.