What are the differences between variable frequency refrigerated dryers and fixed frequency refrigerated dryers?

Variable frequency refrigerated dryers and fixed frequency refrigerated dryers are two commonly used drying equipment, and they have significant differences in their working principles, functional characteristics, and other aspects. Below, we will provide a detailed introduction to the differences between these two devices.

1、 Different working principles

The fixed frequency refrigerated dryer operates based on fixed frequency (fixed electric frequency) technology, using alternating current to drive a high-speed rotating compressor. The high-temperature and high-pressure gas generated by the compressor is cooled into low-temperature and low-pressure gas through a condenser, and then expanded through an expansion valve to lower the gas temperature and achieve operation.

The variable frequency refrigerated dryer works based on variable frequency technology, which controls the frequency of AC power through a frequency converter, thereby controlling the speed of the compressor and achieving the regulation of refrigeration power. Variable frequency refrigerated dryers are suitable for occasions with low demand, which can better meet process control requirements and ensure the accuracy and stability of the production process.

2、 Different power efficiencies

Frequency limited refrigerated dryer is a refrigeration equipment with a fixed output power. Fixed frequency technology cannot achieve real-time adjustment of refrigeration power, so it performs relatively poorly in terms of power efficiency. During the operation of a fixed frequency refrigerated dryer, it is necessary to frequently control the start and stop of the compressor, which can lead to energy waste during equipment start-up. At the same time, the energy utilization rate during operation is relatively low, and larger equipment may even generate excessive pressure waves during start-up, which is not conducive to the stable operation of the equipment.

The variable frequency refrigerated dryer adopts variable frequency control technology, which enables the refrigeration equipment to adjust the refrigeration power, reduce the key state fluctuations during equipment start-up, and thus improve the operating efficiency and energy utilization of the equipment.

3、 Different control precision

In terms of control accuracy, the variable frequency refrigerated dryer performs better. It adopts frequency conversion control technology, which can adjust the refrigeration power and temperature, suitable for situations that require real-time control, and can also control the output power of the equipment to ensure stable operation.

The fixed frequency refrigerated dryer is constrained by frequency limiting technology and can only operate within a certain range of cooling power, and cannot meet production requirements in certain situations that require higher control accuracy.

Overall, variable frequency refrigerated dryers have the advantages of high power efficiency and high output accuracy, making them suitable for applications with high performance requirements. The fixed frequency refrigerated dryer is suitable for scenarios with low power load requirements, but its cost is relatively low, and it still has practical value for some applications with simple operation.