On a hot summer day, there is little that compares to the feeling of coolness when you enter a room with the air conditioning running. This familiar household appliance creates a real miracle, turning stuffy air into a refreshing stream. But have you ever wondered what happens inside a plastic split-wall system?
Many people mistakenly believe that air conditioning produces cold, just as a refrigerator creates ice. In fact, the physics of the process is different: the device does not create a low temperature, but transfers heat energy from one point to another. Heat exchange This is the key concept that underlies the work of any climate technology. Understanding this principle will help you not only better understand the technology, but also save on electricity.
In this article, we will take a closer look at the physical laws that cause air to cool and how refrigerant circulates through the system. You will learn why water drips from pipes outside and what role the compressor plays in this process. This knowledge is necessary for every owner of modern technology.
Physical basis: evaporation and absorption of heat
To understand how cooling happens, you need to remember the school course in physics and the properties of liquids. Any liquid, passing into a gaseous state (evaporated), absorbs a huge amount of thermal energy from the environment. This principle is used in the split-system all types.
There's a special substance circulating inside the system. refrigerant (often called Freon). At normal atmospheric pressure, it boils at very low temperatures, for example, at minus 30-40 degrees Celsius. This allows it to easily pass into gas even in a relatively warm room. When the liquid refrigerant enters the heat exchanger of the inner unit, it begins to actively boil, taking heat from the air that is driven through the radiator by the fan.
⚠️ Note: The refrigerant is in the system under high pressure. Self-attempt to refuel or repair can lead to injuries or equipment failure.
The process of heat removal is continuous while the compressor is running. The air in the room, passing through a cold radiator (evaporator), gives its energy to freon and returns to the room already cooled. Thus, the air conditioner does not “blow out the cold”, but intensively “pumps” heat from your room.
Split system: two blocks - one system
Modern air conditioners are most often split systems consisting of two separate parts. This separation is necessary precisely to ensure that the noisy process of heat removal occurs outside the living room. Let’s look at the role each block plays in the overall cycle.
The inner unit we see on the wall is responsible for distributing the cooled air. It's inside of it. vaporizer A copper radiator that flows through a cold refrigerant. A fan sucks warm air from the room, drives it through the ribs of the radiator and blows it back out. Here, the moisture condensation from the air occurs, so water is collected in this block, drained into the drainage.
The outer unit hanging on the facade of the building serves as a "heat pump". It's located compressorwhich compresses the gaseous freon, increasing its temperature and pressure, and capacitorwhere hot gas gives heat to the outdoor air, turning back into liquid. That is why in the summer from the outside block blows hot air.
- 🌬️ The evaporator: It takes heat from the air in the room, cooling it.
- 🔥 Capacitor: It gives off the accumulated heat into the atmosphere outside.
- ⚙️ Compressor: creates pressure for the refrigerant to circulate in a closed circuit.
Communication between the blocks is provided by copper pipelines through which the refrigerant moves back and forth. The quality of installation of these communications directly affects the efficiency of the entire system. If the track is broken, the refrigerant may not have time to evaporate or condense, which will reduce productivity.
Work cycle: four stages of cooling
The process of cooling air is a continuous cycle, which can be divided into four main stages. Understanding the sequence of these steps allows you to diagnose malfunctions and evaluate the quality of equipment. Let’s look at each step in more detail.
First. compressor It sucks a low-pressure refrigerant gas out of the evaporator and compresses it. When compressed, the gas temperature increases sharply, sometimes up to 80-90 degrees Celsius. In this state, hot gas under high pressure enters the capacitor of the outer unit.
In the outer unit, hot gas passes through a radiator blown by a fan. Here it gives heat to the outdoor air and condenses, turning into a liquid. Then the liquid freon passes through heat-regulating (or capillary tube) where the pressure drops sharply. This results in instantaneous cooling of the substance before entering the inner unit.
In the last stage, a cold mixture of liquid and gas enters the evaporator of the inner unit. Here it boils, actively absorbing heat from the room air. Once converted to gas, the refrigerant is returned to the compressor and the cycle repeats. This process occurs dozens of times per minute, ensuring a stable temperature.
| Cycle phase | Where it's happening. | Condition of refrigerant | Temperature regime |
|---|---|---|---|
| Compression | Compressor (street) | High-pressure gas | High (+70...+90°C) |
| Condensation | Condenser (street) | High pressure liquid | Warm (+40...+50°C) |
| Throttling | TRV/Capillar | Low pressure liquid | Sharp cooling |
| Evaporation | The evaporator (house) | Low-pressure gas | Low (+5...+15°C) |
Role of compressor and refrigerant in the system
The heart of any refrigeration machine is a compressor. It is this that creates the necessary pressure for the circulation of the working body. Without this mechanical pump, the freon would have simply stopped in the pipes and the heat exchange stopped. Modern models use inverter compressors that can smoothly change their power.
Unlike conventional engines, which operate in the on-off mode, inverter It regulates the speed of rotation. This allows you to maintain a set temperature with minimal fluctuations and significantly save electricity. In addition, such systems work quieter and wear less, as they avoid constant initiation currents.
As for the refrigerant itself, its formulas have changed over the past decades. Freons used to deplete the ozone layer (such as R22), but now eco-friendly mixtures such as R22 have become the standard. R410A or R32. They have better thermal properties and are safe for the environment, although they require higher pressure in the system.
- 💨 R22: obsolete freon, gradually decommissioned.
- ❄️ R410A: A popular mixture that requires high pressure, but is effective.
- 🌿 R32: modern, environmentally friendly and energy efficient refrigerant.
Why water drips: condensation and humidity
One of the most common questions users have is why does the air conditioner drip water? The answer lies in the physics of humidity. In warm air, there is always a certain amount of water vapor. When this air comes into contact with the cold radiator of the evaporator, it cools sharply.
Cold air cannot hold as much moisture as warm air. Excess water falls out as condensation on the ribs of the radiator, similar to the way glasses fogging when you enter a warm room from the cold. Special grooves collect this water and divert it through a drainage tube outside or into the sewer.
⚠️ Warning: If water starts dripping inside the room, it is a signal of a drainage clog or icing of the system. Operation in this mode can damage the finishing of the walls.
The amount of water released directly depends on the humidity of the air in the room. In rainy weather, the air conditioner can drain several liters of water per hour. This is a natural process, indicating that the system drains the air, making the microclimate more comfortable for breathing.
Performance and influence factors
How quickly the air conditioner cools the room depends on a variety of factors. The main parameter is the heat load, which consists of the area of the room, the number of people, working equipment and sunlight. If the power is selected correctly, the system will quickly cope with the heat.
However, there are nuances that can reduce efficiency. For example, open windows or doors nullify all efforts, as heat is constantly coming from the outside. Also, polluted filters of the inner unit prevent normal air flow, forcing the fan to work with overload, and the evaporator to freeze.
It is also important to consider the direction of airflow. If the jet of cold air is directed directly at people, it can lead to a cold. It is better to adjust the blinds so that the flow goes parallel to the floor or up, providing natural circulation and mixing of air masses.
Frequently Asked Questions (FAQ)
Why is the air conditioner not blowing cold air?
This may be due to filter contamination, low refrigerant levels, or incorrect mode settings. Also in very hot weather, the difference between the temperature on the street and at the exit of the air conditioner can be 10-12 degrees, which is the norm for serviceable equipment.
Can I use air conditioning in winter for cooling?
Conventional household models are not designed to work on cooling at street temperatures below +5...-15 ° C (depending on the model). The oil in the compressor thickens, which leads to breakage. There are special winter kits that allow you to expand the range, but they are installed separately.
Is Freon Harmful to Human Health?
Modern refrigerants (R410A, R32) are non-toxic and non-combustible under normal conditions. They don't smell. The danger can be only their displacement of oxygen in a very small closed volume with a huge leakage, which is almost impossible in domestic conditions.
How often should the air conditioner be cleaned?
Coarse cleaning filters (nets) are recommended to be washed with water every 2 weeks during the period of active use. Deep cleaning of the internal and external units with disassembly and antibacterial treatment should be carried out at least once a year, preferably before the start of the season.