Siemens looks at HydroAir for wave energy extraction

HydroAir rendering (Image: Siemens)

The Dresser-Rand business, part of Siemens Power and Gas, has developed a new turbine for wave power plants that operates on the oscillating wave column principle.

The Dresser-Rand business developed an impulse turbine, called HydroAir, that significantly improves the financial feasibility of wave energy power plants, according to the company.

The HydroAir turbine operates at up to 75% efficiency with a power rating of 1MW, according to Siemens, and is designed for wave power plants based on the oscillating wave column (OWC) principle.

The waves move beneath a chimney-like chamber partly submerged in the water and alternately push the air upward and suction it downward, creating airflow that drives the turbine.

According to Siemens, the challenge lies in the fact that the airflow changes direction and that its power varies widely between 0 and 100%, depending on variations in waves.

To meet the challenge, the engineers at the Dresser-Rand business developed a housing that extends ‘funnel-like’ from the two sides of the turbine.

Inside, guide vanes direct the air toward the turbine’s rotor. The guide vanes on the two sides are oppositely oriented so that the inlet and outlet air always drives the rotor in the same rotational direction.

The tapered housing, called ‘variable radius’, is the key to the HydroAir turbine’s high efficiency, according to Siemens, as it guides small amounts of air so that the turbine can optimally use even minute airflows.

The guide vanes decelerate the inflowing air masses, inducing a controlled, rotating motion, thereby preventing turbulence in the airflow and reducing turbulence-induced losses by about 50%, Siemens said.

The HydroAir’s housing comprises a combination of stainless steel, aluminum, and reinforced composites, and the technology can be deployed onshore, nearshore, or offshore.

Share this article

Follow Tidal Energy Today

Events>

<< Feb 2018 >>
MTWTFSS
29 30 31 1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 1 2 3 4

Waterpower Week 2018

This 3-day jam packed event provides you the opportunity to network, learn about legislative and regulatory initiatives, and discuss…

read more >

RenewableUK Wave & Tidal 2018

The event will bring together leading developers, OEM’s, financial and innovation funding experts, technical and safety professionals…

read more >

Scottish Renewables Annual Conference

Scottish Renewables’ Annual Conference 2018 will take place against a background of these debates and examine in detail what these changes…

read more >

Maritime & Offshore Career Event (MOCE)

There is something for everyone; MOCE is not only for starters, experienced professionals also visit the event to find their next career move…

read more >