What is the cooling method of car air conditioning?

[OOwen]

Here are the cooling methods of car air conditioning: 1. Compression: The compressor pressurizes the refrigerant sucked back from the evaporator to increase the refrigerant temperature, turning the refrigerant into a high-temperature, high-pressure gaseous refrigerant. 2. Heat dissipation: The high-temperature, high-pressure gaseous refrigerant enters the condenser. Since its temperature is higher than the ambient temperature, it dissipates heat to the environment, turning the refrigerant into a medium-temperature, high-pressure liquid refrigerant. 3. Throttling: The medium-temperature, high-pressure liquid refrigerant exits the condenser and enters the receiver-drier for filtration and moisture absorption, while storing a portion of the refrigerant here. The filtered refrigerant passes through the throttling device for pressure reduction. At this stage, the refrigerant becomes a low-temperature, low-pressure liquid refrigerant. 4. Heat absorption: The low-temperature, low-pressure liquid refrigerant enters the evaporator. The sudden increase in space within the evaporator causes a pressure drop, absorbing ambient heat to vaporize the refrigerant while cooling the air passing outside the evaporator, which is then blown into the car cabin by the blower.

[SanAdrian]

I've been driving for many years, and the cooling method of car air conditioning basically relies on the compressor refrigeration cycle. Simply put, it's like a circulatory system: the compressor compresses the refrigerant gas into a high-pressure, high-temperature state, then sends it to the condenser to dissipate heat, turning it into a high-pressure liquid; next, the liquid passes through the expansion valve to reduce pressure and temperature, spraying into the evaporator to absorb the hot air inside the car, making the air cooler; finally, the cold air is blown out by the fan to cool down. What refrigerant does this system use? In the early days, it was R12, which was bad for the environment. Nowadays, R134a or the newer R1234yf is more commonly used, being more environmentally friendly. The advantages are fast and stable cooling, but over time, refrigerant leaks or compressor failures may occur, requiring regular checks. I suggest running a short trip before using it in summer to let the system start up, avoiding sudden loss of cooling that could affect comfort. Usually, don’t set the air conditioning too low when driving; keeping it around 25 degrees saves fuel and is more efficient.