Compressed air systems are a vital component of many industrial processes, and they come in a variety of types and designs. Two of the most common types are variable displacement and variable speed drive compressors. While both types are designed to optimize system efficiency, there are some important differences between them. In this article, we will discuss the differences between variable displacement and variable speed drive compressors.
Variable Displacement Compressors
Variable displacement compressors, also known as variable output air compressors, are designed to adjust the output of compressed air to meet the changing demands of the system. They achieve this by varying the volume of the compression chamber. The compressor can adjust the displacement of the chamber by using either a mechanical or electronic mechanism. The mechanical mechanism uses a swash plate to vary the angle of the piston, while the electronic mechanism uses a solenoid valve to control the displacement of the compressor. The result is a compressor that can adjust the output of compressed air or refrigerant to match the changing demands of the system.
Variable Speed Drive Compressors
Variable speed drive compressors, on the other hand, are designed to adjust the speed of the motor to match the changing demands of the system. They achieve this by using a variable frequency drive (VFD) to control the speed of the motor. The VFD adjusts the frequency of the electricity supplied to the motor to control its speed. The result is a compressor that can adjust the output of compressed air or refrigerant by varying the speed of the motor.
Differences Between Variable Displacement And Variable Speed Drive Compressors
While both variable displacement and variable speed drive compressors are designed to optimize system efficiency, there are some important differences between them.
First, variable displacement compressors are better suited to applications with varying demands, where the demand for compressed air or refrigerant changes frequently. The compressor can adjust the output to match the changing demand, resulting in higher efficiency and lower energy consumption.
Variable speed drive compressors, on the other hand, are better suited to applications with consistent demands. The compressor can adjust the speed of the motor to match the demand, resulting in more efficient operation and lower energy consumption.
Second, variable displacement compressors are typically more expensive than variable speed drive compressors. This is because they require a more complex mechanism to adjust the displacement of the compression chamber.
Finally, variable displacement compressors are generally more reliable than variable speed drive compressors. This is because they have fewer moving parts and are less susceptible to wear and tear.
Conclusion
In conclusion, both variable displacement and variable speed drive air compressors are important components of compressed air systems. While they are both designed to optimize system efficiency, they have some important differences. Variable displacement compressors are better suited to applications with varying demands, while variable speed drive compressors are better suited to applications with consistent demands. Additionally, variable displacement compressors are generally more expensive but more reliable than variable speed drive compressors. By understanding the differences between these two types of compressors, you can select the one that is best suited to your application.
