Can you open the refrigerator door to make the room cool? What's the difference between refrigerator and air conditioner?

In summer, Xiong Haizi always opens the refrigerator door and stuffs his head in to cool off. My mother was like this when she was a child. It was cool. It is said that doing so will cause headaches. Do you always want to open the refrigerator door to make your home cooler?

Of course, now I know that this naive idea is too unrealistic. Open the refrigerator door, the room will not get cold, but will get hot. Why is this? Please let me explain slowly.

The principle of refrigerator and air conditioner is exactly the same.

Refrigerator and air conditioner are actually one thing, just look at the members of their "working group"-compressor, refrigerant, evaporator, condenser and a lot of pipes. The task of this group is to transfer heat.

For air conditioning, it is to bring indoor heat to the outside (so it has an air conditioning unit and should be placed outdoors). For the refrigerator, it is to transfer the heat in the refrigerator to the room.

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Whether using air conditioners or refrigerators, we are used to calling their working conditions "refrigeration". But in fact, this is not accurate. There is no concept of "cold" in physics, only "heat". The so-called refrigeration process is just where the heat here is moved-neither the refrigerator nor the air conditioner has the ability to eliminate heat, so it can only be transported.

Why the refrigerator can't cool the room.

Since it is handling, there must be a starting point and an end point. The starting point of air conditioning carrying heat is indoors and the end point is outdoors. So turn on the air conditioner for a while, and we feel cool in the room because there is less heat in the room.

The starting point of the refrigerator carrying heat is inside the refrigerator and the ending point is outside the refrigerator. When the refrigerator door is closed for refrigeration, the temperature in the refrigerator will drop quickly, because the heat in the refrigerator is taken outside the refrigerator. But what if you open the refrigerator door? The inside and outside of the refrigerator are connected together, just like we carry a bowl of water, draw a line in the middle of the bowl and transport the water from one side to the other with a spoon-the result is that the water on both sides does not change, no matter how long we carry it.

Not only that, open the refrigerator door for refrigeration, and the room will get hotter and hotter. This is because, in the process of work, the refrigerator will not only eliminate heat, but also convert some electric energy into heat energy-that is, the compressor will heat up after running for a long time. This part of the converted heat energy will also be distributed indoors.

An imaginary refrigeration method of refrigerator

Can that refrigerator cool the room? Actually, you can, but it's more idealistic. That is to find the cooling position of the refrigerator-first move the heat inside the refrigerator to the sides or back of the refrigerator, and then put it down. The back and side of the refrigerator are the heat dissipation positions of the refrigerator.

If you only put the refrigerator indoors and put the back and side of the refrigerator outdoors, can't you achieve the purpose of cooling the room? So you can do this: plug the refrigerator in the window, open the refrigerator door indoors, and hang the rest of the refrigerator in the open air.

Of course, this is just a joke. The design of the refrigerator makes it only suitable for carrying heat in a narrow space. In such a big room, the efficiency of refrigerator is much lower than that of air conditioner. So if you want to cool the room, you should honestly choose air conditioning.

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