www.heatingandventilating.net
Fans case study
Fan solution for subsea power cable link
Manufacturer of fans and motors, Ziehl-Abegg replaced the fans cooling the converter station of BritNed at Maasvlakte in the Rotterdam area of The Netherlands. BritNed is the operator of the high-voltage direct-current (HDVC) subsea power cable connecting the United Kingdom and the Netherlands. The new fans help BritNed lower energy consumption and reduce its carbon footprint
B
ritNed (a joint venture between British National Grid and Dutch TenneT) is responsible for the transport of electricity between the Netherlands to the United Kingdom. The subsea power cable connects the Isle of Grain in Kent with the Maasvlakte in the area
of Rotterdam, a distance of 256 kilometres, and has a capacity of 1,000 MW. In order to convert the high-voltage direct-current (HDVC) to the widely used alternating
current (AC), converter stations are located at each end of the power cable. These heavy duty converter stations, of approximately five hectares each, are permanently working and produce a significant amount of heat. Reliable cooling is a continuous requirement but cooling fans running without interruption consume a lot of energy. With the product series ZAplus, Ziehl-Abegg was able to offer several improvements to the existing system. The newly placed cooling fans have Electronically Commutated (EC) motors which are proven to be highly energy efficient and environmentally friendly. The practical design of the fan allows easy maintenance and improves uptime guarantee.
Above and left: The new fan system ZAplus from Ziehl-Abegg uses as much energy as a full dishwasher or washing machine cycle Below: An employee opens the service ring; this ring enables easy access for maintenance and repair work which can be completed within in a day
The use of EC-Technology will result in a significant reduction of the energy use and the bionic profile of the blades (inspired by the owl) minimises noise pollution to the surrounding area. Altogether, the new fans will help BritNed lower its energy consumption by 450,000 kWh per year and reduces its carbon footprint by 51 tons per year. Improved efficiency is not the only benefit the ZAplus fans bring to the energy operator.
To improve the uptime the fans are equipped with a special service ring which enables easy access for maintenance and repair. The cooling unit no longer needs to be turned off for maintenance, so expensive outages will be reduced. Before the replacement cleaning took two weeks, now it takes one day. The replacement of the 40 fans took place in two batches during planned outages. Kevin
Rendell, BritNed’s operations director, praised Ziehl-Abegg’s swift and user-friendly installation of the new fans. The old cooling fans will be recycled.
www.heatingandventilating.net April 2018
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