Unexpectedly, the air conditioner would "heat stroke"?Intersection

During this time, there was a rumor that the air conditioner was widely circulated, saying that when the air conditioner was too high at the high environmental temperature, the temperature exceeded 60 ° C, far exceeding the air conditioning work temperature, and so on. This statement is partial, but some exaggerated words, let's talk about it carefully.

From Weibo

This summer has entered Sanzan, and high -temperature sauna skys in various places have also been this one after another. However, have you ever thought that although the air conditioner can bring thousands of households, it is cool to a certain extent, the air conditioner itself will also "heat stroke" and cause a shutdown ...

It turns out that the air conditioner also has a suitable working temperature range. If the temperature is too high, it may cause the air conditioning to trigger the protection mechanism, automatically shut down, and bring you a sour day by the way -the air conditioner is hot "heat stroke". Think about you without the air conditioner. What will it feel ...

So why does the air conditioner "heat stroke"? How to prevent it?

01

What happened to the air conditioner "heat stroke"?

To explain this problem, you must first understand the principle of air conditioning refrigeration.

We have all taken the needle and pumped blood. When disinfected, the alcohol cotton was poisoned, and it felt cold on the skin. This was because the liquid alcohol wave turned into alcohol steam. In this process, a lot of heat was taken away.

Remember the feeling of spraying on your body? | Figure insect creativity

The basic principle of the air conditioner is similar to it. It is a refrigerant that rely on liquid refrigerant in the evaporator (the densely dense structures in the air conditioner indoor machine). Of course, it is impossible for us to irrigate the refrigerant to the air -conditioned evaporator to cool down. Therefore, the compressor and condenser (these two are usually installed in the outdoor machine). The gaseous refrigerant from the evaporator will Pressure, cooling, and re -entering the evaporator's gasification. In this way, the refrigerant is circulated and the temperature of the room has dropped.

However, this process is not easy.

Let's talk about the compressor first. The air -conditioning compressor works. The high pressure part can reach more than 2.2MPa, which is about 22 standard atmospheric pressure. The high pressure cooker we usually use usually can only reach 0.18MPa, which is less than 2 Standard atmospheric pressure. And the higher the ambient temperature, the more laborious the compressor works. In order to achieve the set temperature of the air conditioner in the house, it will run longer, and the more electricity is.

The higher the ambient temperature, the heavier the air conditioning refrigeration burden |

Besides the condenser, its role is to cool down the refrigerant of the high -pressure gaseous gaseous gaseous gaseous after the compressor processing, allowing them to change back to the liquid. This process needs to release a lot of heat, so a powerful fan is required to allow the air to flow over the condenser to dissipate heat. The environmental temperature is high, and the heat dissipation efficiency will decrease.

In addition to the inspiration of the refrigerant, when the compressor and fan work, the machine itself generates heat. If the ambient temperature is too high and the heat dissipation effect is worse, the air conditioner will be overheated, which may cause device failure, damage, or even fire. Therefore, the air conditioner has an overheating protection device. If the temperature of the air conditioner is too high, it will be turned off automatically, so the air conditioner is "heat stroke".

02

How many degrees of air conditioning will "heat stroke"?

So how much will the air conditioner turn off automatically? This mainly depends on the environmental temperature and the performance and state of the air conditioner itself. According to the 2019 version of the national standard GB/T 7725 "room air regulator" used in the air conditioner, our most common air conditioner in China is T1. This type of air conditioner should be normal as long as the ambient temperature is below 43 ° C. Work.

From GB/T 7725-2019 "Room Air Regulator"

Of course, air -conditioning manufacturers often leave some margin to deal with extreme conditions. Therefore, even if the ambient temperature exceeds 43 ° C, the air conditioner will still stick to work. Fortunately, most parts of my country, the maximum temperature in summer usually does not exceed the 43 ° C limit of the air conditioning standard. The high environmental temperature trigger heating protection causes the shutdown of air conditioners.

As for the news that the outdoor floor temperature is 60 degrees, the saying of the normal use range of the air conditioner is confusing the concept.

Because the "ambient temperature" we said usually refers to the atmospheric temperature at the equipment operation site or the atmospheric temperature near the air inlet. For a correct installation and heat dissipation air conditioner, this environmental temperature can be said to be about the temperature of the location. The temperature is the temperature of the thermometer in the louvery of 1.5 meters away from the observation station of the meteorological department.

As for the surface temperature, as the name implies, the temperature of the ground. Due to the direct sunlight, in the strong sunlight, the surface temperature can easily reach 50-60 ° C, while the temperature is only 30-40 ° C. As we all know, the air -conditioning outdoor unit is hung outside, not buried in the ground ... so the ground temperature in the above picture shows that the temperature of the air conditioner is far exceeding the air conditioner, which is alarmist and ignore it.

From Tujie Creative

Some readers and friends may doubt that the temperature here has not reached 43 ° C. Why is this air conditioner stopped? Let's analyze the reason next and see what to do.

03

How can I "avoid summer" by air conditioning?

The air conditioner is turned on overheating because the equipment temperature is too high, and even if the ambient temperature is not very high, as long as the heat produces too much heat or the heat dissipation is unfavorable, it may still cause overheating. In order to avoid this, we can do so many things:

1. Correct installation

When installing the air conditioner, be sure to consider heat dissipation and leave enough heat dissipation space around the outdoor machine. Some research simulation found that if the air conditioner outdoor unit is too tight, it will cause the environmental temperature in the region to rise and affect heat dissipation. In addition, in order to be beautiful, some buildings "hide" the outdoor unit into small compartments, plus shuttle windows, look aesthetically, but if the lunch window and small compartments are not available, the air temperature temperature that can be inhaled outdoors may be inhaled. Rising to above 50 ° C [1] brings heavy burden on the air conditioner and trigger heating protection. Therefore, for air conditioners dominated by refrigeration, when installing the air conditioner, you need to choose as much as possible as possible.

2. Regular maintenance

Air conditioning heat dissipation, good air circulation is very important. If it is blocked by dirty things, it can not rotate the air flowing channel, or too many fans can not rotate. Even if the environmental temperature is not high, it may cause overheating protection. The refrigerant is the medium used to "carry" the heat when the air conditioner is working. If the air conditioner is used for many years and the refrigerant loss is too much, the refrigerant efficiency will decrease, and the outdoor opportunity is desperately working to overheat. In addition, the outdoor machine is hung outside, and the wind blows the sun all year round. Some originals may be aging, and they are more irritable.

Therefore, the air conditioner needs to be cleaned and maintained regularly to maintain a good working state.

Using air conditioners healthy, indoor machines must be cleaned regularly | Tuwa creativity

3. Reasonable use

Under the premise of more comfortable, in summer, we can set the air conditioner temperature between 26-30 ° C to reduce the burden on the air conditioner and save electricity. The air conditioner can make us cool, but it is not necessarily used to use the air conditioner. For example, when using the air conditioner, it is supplemented by a small fan to allow the air to circulate. If no one is at home during the day, you can also pull up the shielded curtains, so that the temperature in the house will be slow, and the air conditioner does not need to work for a long time to cool down.

It is easy to accumulate heat in the curtain room in midsummer.

Finally, it is summarized that the air conditioner does have an overheating protection mechanism. If the temperature is too high, the protection will trigger the protection and cause the shutdown. However, the high temperature is only one of the reasons. Improper installation, poor maintenance, and too heavy burden may lead to overheating air conditioning. In such a hot summer, take care of your air conditioners to take care of you.

Author | Ding Yan

Review | Qin Zongmin China Refrigeration Society Senior Engineer

[1] Jiang Yuebo, Jin Wufeng, Liu Yang, etc. The numerical simulation of the hot environment around the air -conditioning outdoor unit under different installation conditions [J]. Flow machinery, 2013, 41 (9): 5.

Reprinted content only represents the author's point of view

Does not represent the position of the Institute of Physics of the Chinese Academy of Sciences

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Source: science rumor

Edit: Muyu

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