The Upright refrigerators and horizontal refrigerators in the market use air cooling, refrigeration, etc., but they are all different types of refrigerants R600A and R134A. Of course, the “catalyst” here refers to the transfer of energy, that is, vaporization and condensation to achieve heat transfer. For ordinary people, we only need to understand that it is an important part of refrigerator refrigeration.
To make it easier for you to understand, the basic principle of refrigeration relies on the inverse Carnot cycle through four key steps:
(1) Compression (high temperature and high pressure gas)
The compressor compresses the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure gas, causing its temperature to rise significantly (e.g. from -20 ° C to 100 ° C).
(2) Condensation (heat dissipation becomes liquid)
The high temperature and high pressure gas enters the condenser, releases heat through the cooling fan, and turns into a normal temperature and high pressure liquid after cooling.
(3) Expansion (reduced pressure vaporization endothermic)
After the high-pressure liquid passes through the expansion valve, the pressure drops sharply, partially vaporizing and absorbing the heat around the evaporator, causing the inside of the refrigerator to cool down.
(4) Evaporation (low temperature and low pressure gas)
The refrigerant liquid at low temperature and pressure is completely vaporized in the evaporator, absorbing the heat in the refrigerator, and then returning to the compressor to complete the cycle.
At this point, the key role of the refrigerant is reflected in the phase change heat absorption and exotherm, and the process of vaporization heat absorption will cool the refrigerator.
Note: The refrigerant is recycled in a closed system and used repeatedly without being consumed. Its physical properties (e.g. low boiling point, high latent heat) determine the cooling efficiency.
Here I need to explain to you that users may confuse the concept of “catalyst” with “medium”. Refrigerants do not participate in chemical reactions, but transfer energy through physical phase changes, but their performance directly affects the cooling effect (such as efficiency, temperature), just like the importance of catalysts in chemical reactions, but the two mechanisms are completely different.
Features:
(1) It is easy to vaporize and absorb heat at room temperature (e.g. R600a boiling point – 11.7 ° C), has chemical stability, and is not easy to decompose or corrode equipment.
(2) Environmental friendliness: Reduce damage to the ozone layer (e.g. R134a replaces R12).
Refrigerants are the core medium of commercial refrigerator refrigeration. They transfer heat through phase change, similar to “heat porters”, which release the heat inside the refrigerator to the outside by circulating, thus maintaining a low temperature environment.
Post time: Mar-10-2025 Views: