April 4, 2008
Coiltech, part of the Luvata Group. launched its new range of dry coolers with the adiabatic filter system at this year’s Nordbygg, the most important exhibition in Northern Europe for the construction sector, which this year attracted more than 54,000 visitors from all over Europe.
Coiltech which specialises in the production of heat exchangers and ventilated units for large industrial applications, was displaying its products under the Luvata banner for the first time. One of the most prominent was the new application for COOL, the well-known modular liquid cooler produced by Coiltech. This has been fitted with an adiabatic filter for commercial and industrial applications in environments with medium to high external temperatures, which tend to come close to, or even exceed, the output temperature of the process liquid.
Specifically developed for the cooling of process liquid in large industrial plants, the new COOL with the adiabatic filter is the most technically advanced and safest solution among applications with water-cooling systems of the heat exchanger fins.
Already recognised as the preferred solution over the complex cooling towers, the adiabatic filter system has numerous advantages compared to other systems, such as the use of nebulised water.
The filters, by avoiding contact between the exchanger fins and tubes and the water, eliminate the risk of corrosion of the fins and tubes; and prevent the formation of limescale, consequently saving on costly purification and demineralisation systems.
Another benefit, especially important for air conditioning systems, is that it avoids water stagnation, a primary cause of the formation of Legionella. The filter system, in fact, allows the recirculation of the water through special ducting along with its complete re-use and substitution.
Even in windy environments, the cooling water, that is discharged and flowed down the filter, is not dispersed, in contrast to how spray systems function, and this ensures the maximum endurance of the system.
The operation of the machine is managed by an electronic control unit with frequency converter that regulates the speed of the fan motor, the pump and the water valve. When the external temperature decreases, a sensor automatically blocks the adiabatic system, optimising energy consumption.
Luvata’s heat transfer solutions are already applyingthis same technology in its VCE-W, with excellent results.
The filters, which can be removed during the cold season, are made of the same material that has been used for some time in air treatment units and are generally installed on the intake sides of the machine, guaranteeing durability and maximum hygiene. An ad hoc project also sustains the development of solutions that are optimised for low noise versions using the latest generation of electronically commutated fan motor systems and filters with low pressure drop.
In conclusion, the application of adiabatic filters, thanks to the water cooling of the air upon entry, allows a significant reduction in the surface of the heat exchanger, consequently saving on raw materials and energy consumption, also enabling the reduction of the number of fan motors.