Mitsubishi FR-F800 offers more than just energy savings
Mitsubishi F800 offers more than just energy savings.
Although the motivation behind installing variable speed inverter drives is invariably payback based on energy savings, modern drives like Mitsubishi Electric’s FR-F800 offer more than just energy savings for building users.
Building users and facility managers continually look for ways to save energy and money. Recent government regulations and the rising popularity of the “green building” concept have led to new construction and retrofit projects that achieve energy efficiency to benefit the building owner and occupants. This includes using variable speed drives on fan and pump motors.
Other Benefits of Variable Speed Drives
Variable speed drives also contribute to the building’s overall comfort level by optimising and regulating air flow and temperature into the building’s occupied space. Unlike a fan that runs either full speed or off, a variable speed drive can run at all speeds in between, allowing facilities managers and building occupants more control to adjust the temperature. They take occupant comfort one step further with accurate flow control and a modulating output switching frequency to reduce noise pollution caused by motor operation.
In addition, Mitsubishi Electric VSDs reduce the long-term wear and tear on equipment. Motors run slower; plant rooms run quieter. The drives provide a soft start instead of slamming motors on at full speed, so HVAC systems last longer, requiring less maintenance and causing fewer instances of unscheduled downtime.
Building Services Integration
On-board networking ensures the motor applications are integrated and regulated by the BMS, and increasingly, drives have built-in controllers to reduce the requirement for complex building control interfaces.
Since HVAC systems in particular are huge energy consumers, highly efficient systems offer the opportunity for great energy savings. HVAC equipment offering opportunities for energy savings includes centrifugal air handler fans and exhaust fans; centrifugal pumps for hot and cold water; cooling tower pumps and fans, and compressors
Payback Period of Variable Speed Drives
The payback period of a VFD averages 18–24 months but can be less than 12 months. The period depends largely on the type and size of the system and how much time the motor is operating at full speed versus how much flow is actually required to heat or cool the building space. The life cycle of HVAC equipment in commercial buildings is typically 15–20 years, so a one or two-year payback period can generate a substantial return on investment.
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