There is no compressor like a compressor: which is the best one for you?

There are many different technologies in the history of commercial compressors. Today, the vast majority of commercial compressors are reciprocating or screw compressors. Only the largest commercial compressors use centrifugal force as the main operating principle. But there is another dimension to consider when deciding which kind of compressor to get. This additional dimension can be considered as the architecture that underpins the compressor technology. Three types of compressors are based on this:

• Hermetic

• Semi-hermetic

• Scroll compressors.

Whichever architecture you choose, the technology will have a significant impact on the compressor’s performance.

What is a hermetic compressor?

The hermetic compressor is completely sealed from the environment with a closed housing. It cannot be accessed in any way. The very meaning of the word “hermetic” means airtight. It is mainly used for refrigeration circuits.

Hermetic reciprocating compressors for refrigeration are enclosed units in which the motor and compressor are housed in a hermetically sealed enclosure, providing protection against refrigerant leaks. The piston in the compressor compresses the refrigerant, increasing its pressure and temperature, allowing it to condense and subsequently cooling the environment. The enclosed design makes these compressors quiet, reliable and used in a variety of refrigeration systems such as domestic refrigerators and air conditioners.

However, the hermetic compressor has significant drawbacks that limit how it can be used, especially in harsh environments. They are usually limited to smaller systems. They are often found in consumer products. In situations where you need to maximize performance and efficiency, a hermetic compressor is often off the table. It cannot be opened and serviced in the event of a mechanical problem. The problem may be simple and easy to fix, but the only option is to completely replace the compressor.

What is a semi-hermetic compressor?

As with a hermetic compressor, a semi-hermetic compressor has both the compressor and motor fully protected from the environment in a sealed enclosure. Unlike the hermetic compressor, these models are designed to be opened for diagnostics and regular maintenance.

Semi-hermetic refrigeration compressors have the motor and compressor housed in a common casing, which is, however, disassembled, allowing maintenance and repair of the individual parts. These compressors work on the principle of compressing the refrigerant by means of a piston or screw mechanism, thereby increasing its pressure and temperature. Due to their robustness and serviceability, they are often used in industrial and commercial refrigeration systems.

Maintenance is the key to extending the life of the compressor. No compressor lasts forever, modern compressors can operate at full efficiency for their entire operating life as long as they are properly maintained.

What are scroll compressors?

A scroll compressor, also known as a scroll pump, is a type of positive displacement compressor. It works on the principle of internal compression of air or gas. Scroll compressors can be oil lubricated or in oil-free design.

Scroll compressors for refrigeration work on the principle of two scroll elements, one of which is stationary and the other moves eccentrically, thus gradually compressing the refrigerant. This type of compressor is efficient, quiet and has fewer moving parts, which reduces wear and tear and extends the life of the equipment. Due to their reliability and high performance, they are often used in air conditioners and refrigeration systems with low to medium capacity.

Conclusion

Having introduced the main types of compressors, it can be stated that there is no clear answer as to which type is the best. Each of them offers different advantages and disadvantages. Ultimately, it all depends on the specific needs. AtSlovklima, we have all the relevant knowledge, so we will be happy to guide you through the selection of the right compressor and give you expert advice.