Air conditioning refrigeration principle

As summer slowly approaches, the weather is getting hotter and hotter. Summer essentials such as ice cream, popsicles, fans, air conditioners, etc. are also becoming increasingly popular as the temperature rises. Especially in the 21st century, with the increasing development of modern industry, people's damage to the environment is becoming increasingly serious, and the emission of greenhouse gases such as carbon dioxide is increasing, which leads to an increasingly serious greenhouse effect. Therefore, those of us living in modern times have air conditioners installed in our homes to a greater or lesser extent.

However, when using the air conditioner, people may encounter the situation that the air conditioner cannot be turned on or can be used normally but the air conditioner does not cool. Especially after using the air conditioner for many years, this situation is particularly prone to occur. Let us explain the refrigeration principle of the air conditioner.

The air conditioner compresses gaseous Freon into high-temperature and high-pressure liquid Freon through a compressor, and then sends it to the condenser (outdoor unit) to dissipate heat and become liquid Freon at room temperature and high pressure, so the outdoor unit blows out hot air. Liquid Freon enters the evaporator (indoor unit) through the capillary tube. The space suddenly increases and the pressure decreases. The liquid Freon will vaporize and become gaseous, low-temperature Freon, thereby absorbing a large amount of heat. The evaporator will become cold, and the fan of the indoor unit will blow the indoor air through the evaporator, so the indoor unit blows out cold air. The water vapor in the air will condense into water droplets when it meets the cold evaporator and flow out along the water pipe. This is why the air conditioner will discharge water. The gaseous Freon then returns to the compressor to continue compression, and the cycle continues. When heating, there is a component called a four-way valve that makes the flow direction of Freon in the condenser and evaporator opposite to that in cooling. Therefore, when heating, cold air is blown outdoors and hot air is blown indoors. In fact, it is the principle learned in junior high school physics that heat is released during liquefaction (from gas to liquid) and heat is absorbed during vaporization (from liquid to gas).

The above is the refrigeration principle of the air conditioner. From it we can see that the refrigeration of the air conditioner is definitely quite complicated, but in our daily life, if the air conditioner fails to cool, we might as well refer to the above principle to roughly understand where the problem is with the air conditioner. When calling for maintenance, we may also tell the maintenance technician what the problem is so that they have targeted maintenance tools.