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System reduces costs and increases reliability

The innovative Nordex Advanced Anti-icing System comprises

a sensor positioned on the nacelle and heating elements

integrated in the rotor blade, which work on the principle of

electrical resistance heaters. The heating elements are each

composed of many individual segments and are positioned close

to the surface. Hence – unlike hot-air heaters – they do not heat

the entire blade structure from the inside but directly impact the

aerodynamically relevant surfaces of the rotor blade threatened

by ice formation.

However, the special feature is the full integration of the Anti-icing

System with the lightning protection functionality. The combined

function of these two systems reduces costs while the segmen-

tation of the heating elements increases robustness, because the

failure of a single segment only slightly impairs the function of the

overall system.

In order to keep the energy consumption of the Anti-icing System

as low as possible, the turbine control can adjust, fully variably,

the heating output to the prevailing climatic conditions.

Continued operation even under harsh conditions

Thanks to improved algorithms and models for the temperature

development of the rotor blade surface, no sensors are required

in the rotor blade anymore, this improves reliability and reduces

service cost. Instead, their task is managed by a sensor pos­

itioned on the nacelle and, in addition, the relevant environmental

parameters are continuously monitored, with the data being for-

warded to the control unit of the system. As soon as the data pre-

dicts the danger of ice formation, the control unit automatically

switches on the heating elements. Consequently, this prevents

icing of the rotor blades before it even occurs or thaws any ice

that may have already formed.

After a turbine has been out of service – following events such

as a grid failure – a turbine equipped with the Advanced Anti-icing System can be restarted faster in freezing conditions. In a

case such as this, the turbine control unit detects the reduction in

output due to ice formation and activates the Anti-icing System.

The heating elements located close to the surface melt the ice

within a short time and the turbine can once again produce power

in the optimum output range.

The Advanced Anti-icing System for the Delta4000 has been

undergoing field tests since 2014 and is already available with

start of serial production. The existing proven Nordex Anti-icing

System is available for turbines of the Delta generation.

Left: The Advanced Anti-icing System reduces

icing-related output losses by up to 80 per cent; the

photo to the right shows a turbine with the system

deactivated for comparison purposes.

The new energy-optimised resistance heating

only acts on the areas of the rotor surface that

are particularly threatened by ice formation. As a

result, the energy consumption of the system, at a

maximum of 125 kilowatts for all three rotor blades,

is especially low.

It is a highly robust overall system due to seg-

mented heating elements. If necessary, individ-

ual segments can be replaced without having to

dismantle the rotor blade.

Losses in output due to ice formation can be

reduced by up to 80 per cent.

The advantages of the Nordex Group’s

Advanced Anti-icing System:

INSIDE PRODUCT MANAGEMENT

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