Variable speed drive technology in the refrigeration industry
The use of variable speed drives (VSDs) also known as variable frequency drives (VFDs) in refrigeration applications provide dramatic energy savings by optimising the refrigeration system. This is achieved by varying the range of speeds of the compressor, fan and pump motors that drive the refrigeration systems.
Most standard refrigeration systems operate at reduced capacity. This is because the refrigeration motors that drive the compressors pumps and fans are designed to operate at maximum load conditions on a fixed speed.
During the majority of the time of the refrigeration system is operating, the cold storage load is not at maximum load conditions, but more so at average cold storage load conditions.
Therefore a refrigeration system operating consistently at full motor capacity is not required. Refrigeration systems working at full motor capacity are constantly running at a higher speed than necessary and invariably are using more energy.
Variable speed drive performance factors
A refrigerator that uses variable speed drives runs at only the capacity needed and can deliver a cost saving of up to 30% and in some cases 50% in reduced energy consumption
When variable speed drives are installed correctly they can deliver immense improvements to energy efficiency compared to other modulation and energy saving technologies.
Variable speed drives allow the refrigeration system to operate in a wide range of speeds compared to a motor fixed speed.
Benefits of using variable speed drives in refrigeration systems
There are many benefits that can be gained from installing variable speed drives into your refrigeration system. In addition to extensive energy savings some of the other benefits are;
- Motor load benefits from the reduction in speed
- Reduced wear and tear on the compressors
- Ability to use a smaller compressor with the same system capacity demand
- Reduced harmonics and noise though reduced starts and stops
- Decreased stress on critical valves and pipes, due to lower pressure differences
- Extended mechanical component lifecycle
- Fewer service maintenance call outs.
Optimising refrigeration motors using variable speed drives
Fixed speed operated refrigeration systems subject the motor to high starting engine speeds and current surges which can be up to eight times the full operating load current.
Variable speed drives help by gradually increasing the motor to full operating speed, which in turn lessens the mechanical and electrical stress. Consecutively this reduces the maintenance and repair costs and the life of the motor and the drive equipment are extended.
Go ahead and have Total Climate Solutions assess your refrigeration system for a Variable speed drive installation.
Call 1300 827 679 to speak to one of our professional and friendly team members today. We can have your improved refrigeration system up and running with no down time to your business.
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