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Variable Frequency Drive Applications in HVAC Systems

April 28, 2023

A variable speed drive, also known as a VFD or frequency converter, is an electronic device that controls the speed of an electric motor by adjusting the frequency and voltage supplied to it. It works by converting AC power into DC power before using a series of transistors to adjust the voltage and frequency supplied to the motor. 

As an essential component in modern HVAC systems, variable frequency drives like Danfoss drives can help provide longevity and bring out the best performance of your HVAC system. In this blog post, we'll explore how VFDs are changing the game in HVAC technology and revolutionizing the way we control our heating and cooling systems. 

Applications of a variable speed drive in HVAC systems

1. To convert the incoming AC power to DC:

One of the key applications of a VFD is its capability to convert incoming AC power into DC power. This conversion process allows more precise control over the motor's speed and torque output, enabling it to operate at optimal levels for different load conditions. By using a VFD such as a Danfoss drive, HVAC systems can run at variable speeds depending on demand while reducing energy consumption and lowering operating costs.

2. To ensure the soft start of the HVAC system:

A soft start is necessary for HVAC systems because it reduces the impact on the system's components. Traditional HVAC systems use direct-on-line starters, which can cause a sudden surge of power when starting. This surge can damage or wear down the system's electrical and mechanical components over time. A VFD helps mitigate this issue by slowly ramping up power instead of delivering an immediate jolt. The VFD controls the speed and torque of the motor during startup, ensuring that there is no sudden increase in demand for electrical infrastructure.

3. To improve the power factor:

Another application of variable frequency drives in HVAC systems is to improve the power factor. Power factor is a measure of how efficiently electrical power is being used by the system. In HVAC systems, there are usually components that have inductive loads, such as motors and transformers. These components can cause a low power factor which results in higher energy costs and increased wear on equipment. By using VFDs, it's possible to optimize the amount of electricity consumed by these components while also improving their efficiency. This leads to better overall system performance and reduced energy bills for building owners.

Investing in Danfoss drives will provide a range of benefits for HVAC systems in commercial buildings. You too can ensure the longevity of your HVAC system by getting your hands on Danfoss VFDs. Contact us at Bauer GMC to know more!