Efficiently moving air in the cooling tower industry
02 July 2019 | Web Article Number: ME201915053
COOLING towers are used for cooling processes, installations, data centres and buildings. Fans integral to this process, dissipating surplus and non-usable heat to the ambient atmosphere.
A high air flow rate is required for this purpose. And efficiency is becoming an ever more important criterion, as energy consumption is a significant factor in terms of operating costs.
That’s according to EBM-Papst, whose range now includes axial and centrifugal fans with the appropriate corrosion protection specifically for such applications.
“The advantages of EC technology, namely efficiency, infinitely variable demand-based control characteristics and uncomplicated operating state monitoring via MODBUS RTU, guarantee a rapid return on investments,” the company said in a statement.
For use in cooling towers, its portfolio contains a new axial fan with double flange housing of 1,250 mm which it says is particularly suitable for high pressure ranges and is already available for delivery.
The extremely harsh ambient conditions with 100% humidity in combination with high temperatures inevitably lead to corrosion and a high degree of wear. So a particularly robust fan design with a special coating for metal parts and electronics circuit boards is essential, said the company.
“EBN-Papst fans for cooling towers are rigorously checked in various tests (thermal cycling/wet test, salt fog test, Highly Accelerated Lifetime (HALT) testing, shock and vibration tests) and are thus ideally equipped to provide reliable operation in cooling towers.”
The company cited noise levels as another reason for using EC technology, as outdoor installations are subject to maximum noise generation regulations in many countries.
Reducing the speed to half the air flow cuts the noise level of by +/-15 dB(A), whereas an improvement of only 3 dB(A) is attained with AC fans.
The company said the fans are well suited for use in FanGrid arrangement, “in other words in a system of centrifugal or axial fans operating in parallel. This offers the advantages of a better air flow through the cooling tower and quick and easy fan replacement.
“Operational reliability is an essential prerequisite for cooling towers. With an appropriate number of fans, the necessary air flow can always be attained even if one fan is out of operation (redundancy). The speed of the other fans is then simply increased to compensate for the missing air quantity, and the same flow through the cooling tower can be maintained.”
The EBM-Papst Group is the world's leading manufacturer of fans and motors. Its fans and motors are used in many industries, including ventilation, air conditioning and refrigeration, household appliances, heating, automotive and drive engineering.