On a hot summer day, when you were a child, you would open the refrigerator door and cool down with that cold air. If you apply it from there and leave it open, will the temperature of the room be lowered? You may have thought that. Here, while also touching the difference with the air conditioner, i will explain scientifically whether the temperature of the room will be so if you leave the door of the refrigerator open.
The basic principle of cooling refrigerators is vaporization heat.
Vaporization heat, which is the basic principle of a refrigerator, is a phenomenon in which the heat around it is exposed when the liquid changes to a gas. In a familiar example, “sprinkling water on the ground” uses this principle. This principle can create a state with a lower temperature than the surroundings.
Circulating structure of refrigerator
In the case of pouring water is a change from the liquid to the gas of water, the substance used in place of water in the refrigerator is referred to as refrigerant. By circulating the refrigerant while changing the liquid and gas, we have created a mechanism to continuously cool.While lowering the temperature around by absorbing heat by the change of the material, the opposite reaction on the other side of the circulation, i.e. a change that emits heat has occurred. By the release portion of the heat in the refrigerator is carried out on the outside of the refrigerator, it is possible to continue to only cool in the refrigerator.
Quiz: What happens to the temperature of the room if you leave the refrigerator door open?
Now, let’s think about the title problem.
“What happens to the temperature of the room if you leave the refrigerator door open?” Of course, there is no exchange of temperature with the outside of the room. In addition, it is assumed that the body temperature of the person inside is not affected.
- The temperature of the room goes down.
- The temperature of the room does not change.
- The temperature in the room goes up.
When I look at the above explanation, you feel that 2 is the correct answer somehow …The correct answer is 3.
Why does the temperature of the room rise?
Changes in temperature due to changes in the gas and liquid of the refrigerant of the refrigerator is 0 if integrated. So what causes the temperature to rise? It is due to the heat generated in the machine part of the refrigerator. Specifically, it is a device such as an evaporator or compressor that is incorporated to expand and compress the refrigerant. These are driven by electricity, but not a little wasteful thermal energy occurs when converted from electrical energy to power. Only this amount of heat rises the temperature of the entire room.
From a physical point of view, the total amount of energy does not change if only the same thing circulates in a room without energy interaction with the outside. It is the law of energy conservation. However, in this situation, although there is no heat exchange with the outside world, electrical energy is flowing in. It can be explained that the total amount of internal energy is increasing by the amount of electricity energy, and that part of the conversion of the energy is thermal energy.
The structure of the air conditioner is almost the same as the refrigerator.
The principle of the air conditioner is almost the same as the refrigerator. It only releases the heat generated in the refrigerator to the outside of the room. Therefore, unlike the refrigerator, it is necessary to install the outdoor unit outside.