Improving cooling tower efficiently and knowing the pros and cons of different types of cooling tower tech is essential to delivering a comfortable environment at a cost-effective rate. Read this advice from your local NJ commercial HVAC contractor.

Old Cooling Tower Tech vs. New

Cooling tower motors are designed specifically for commercial or industrial application, driving the fans and pumps that remove heat and push cool  water through the system. In older cooling towers, the motor runs at its full load rating, even if you’re utilizing commercial HVAC control systems to only deliver cool air where needed.

New cooling tower equipment utilizing improved motor drive technology can  increase overall efficiency, while also improving noise reduction, reliability and safety. This comes in two forms of cooling tower frequency drives – Variable Frequency Drive (VFD) and the Reduced Voltage Soft Starter (RVSS).

The Advantages and Disadvantages of VFDs

Cooling Tower VFD Diagram

Courtesty Cooper Union Engineering School

Starting the cooling tower motor requires greater torque than running a motor at full load rate, and this means that a surge of power occurs that can lead to malfunctions or wear-and-tear to the system. VFDs work by diverting this stress away from insulation and includes low-speed stability settings to promote minimal oscillation and noise. This way, your motor lasts longer, operates far more efficiently, uses less power and the full load amp is reduced.

The one disadvantage of this route is that the initial outlay is costly – but this is off-set over the long-term when you consider the impressive savings from reduced water and electricity use, and low maintenance costs.

The Advantages and Disadvantages of RVSSs

Soft starters reduce motor voltage so that starting torque can be reduced to safe levels. These manage the cooling tower motor’s acceleration to reduce wear-and-tear, require less maintenance due to active torque reduction that reduces stress on the motor, and the motor acceleration time is fully adjustable to give you greater control. The reduced starting torque means significant energy savings, and the equipment is much more compact than VFDs. They are also much more affordable.

There are disadvantages, however – including the fact that there is no modulation, no programming capabilities and no amp reduction.

Full Commercial HVAC Control System and Ventilation Equipment Installation from Leading NJ Commercial HVAC Contractors

At Tri-tech Energy, commercial HVAC control systems and commercial ductwork and ventilation systems are our specialty. With over 30 years of experience in the HVAC industry, we are able to assist our commercial and industrial clients with all aspects of their building’s system, from repairs and maintenance to developing custom heating systems for re-fitted or new buildings. We also do commercial HVAC ductwork insulation for additional energy-efficiency. For more information on our company or services, please contact us today or visit our website at