Tag Archives: micro CHP

Green Turbine has an updated website

Green Turbine has updated their website on several topics.
Do you want to know what people in your industry are saying about our turbines? Read some of our client testimonials to find out who is benefiting from our products.

Furthermore, Green Turbine has added some more information about partners and projects. We hope that these projects and inspire others to work and develop with Green Turbine technology!

Green Turbine develops micro steam turbines in the range of 1.2-15 kW. Currently, the Green Turbine 1.2 kW  version is available for sale (due to further development this version actually generates 1.4 kW) and a 15 kW version is under development.

1.2 kW turbine
Green Turbine 1.2 kW

talking about ‘smart grid’

The discussion about ‘smart grid’  never comes to an end. Even at the White House  President Obama  emphasizes to  support the development of wind and solar power and to use less energy.electriciteitsnetwerk

The future of smart grid is a world where home thermostats and appliance work automatically,  depending on the cost of power. A world where a boiler gets power from a neighbour’s rooftop solar panel and  a plug-in hybrid electric car charges in one minute at a very hot day  and the next moment sends back the electricity  to prevent  the grid  going down.

A world in which energy companies will be warned directly when a transformer  is out of order and  can choose easily among energy sources. Wind and solar energy will produce energy  from coal-burning plants and provide homes and business automatically from prearranged power agreements.

‘ The electric network will be  a  close cooperation of information technology and automation technology’, said Bob Gilligan, vice president for transmission at GE Energy. ‘ This is the energie Internet which is hunting the smart grid development. In the next ten years  there will be applications of which nobody can says if  whether we shall need them.’

Smart grid is the future for  hundreds of  technology companies and utilities and for technology there will be  $4,5 bilion  available  in federal economic recovery. However, cost estimates run as high as $75 billion  and the question is; who will  pay for the bill?

Today’s grid is an aging spiderweb of power lines that crisscross  the country. An inefficient one-way movement of electrons from power plants to consumer. The grid has to be more flexible and reliable and more easily controlling the flow of electrons. From houses and business  energy will flow and neighbours will use local power in stead of a single source.

It is important to convince people of the  benefit from smart grid.  The purchase may be  more expensive, but  through efficiency and demand reduction it will save 5 to 15 percent.  So this pays for itself.

Although a Smart Grid can save substantially on costs, we have to realize that about 60% or more of centrally generated power is wasted. So it may be a wise policy to invest also in decentralized power generation. Not only in Solar PV systems and wind turbines, but also in micro CHP (Combined heat and Power on a domestic scale). Here, virtually no energy is wasted.

Others are also worried about security.  If not very well secured, it can be a  major securety risk.  So smart grid has to be incredibly secure.  And maybe consumers will turn the thermostat down if they feel spied in their home.

The case for steam

Say: “Micro turbine” and people think of jet engines. And how small is micro anyhow? The smallest micro turbines (gas turbines that is) are still at least 30 kW: enough for a good sized apartment building.  http://www.capstoneturbine.com/
Making smaller gas turbines is hard to do, engineers face extreme stresses and temperatures in rotors and bearings. The laws of fluid dynamics can not always be scaled down easily.
So, a real micro turbine in the range of 1-5kW having a long working life, a good efficiency and burning all types of fuel is still a promise.
But if we want a decentralized power system, where every household can make its own power, that is exactly what we need.

More than a century ago, Mr. De Laval, a genial Swedish engineer, invented a small steam turbine. To be more precise: he invented THE steam turbine (although Mr. Parsons deserves some credit here too)
For some mysterious reasons, soon afterwards all research efforts were focused on developing large and even huge steam turbines. Mainly because very big steam engines of the reciprocating type were hard to manufacture and unsuited for driving generators. Because now we had a second industrial revolution at hand: electricity!

What happened in the past century was that enormous amounts of money and effort were spent on the development of gas engines (the automobile industry), gas turbines (jet engines, the aircraft industry) and very little in developing steam turbines. There are a handful of manufacturers of steam turbines in this world. They all build large and very large machines. A company like Elliott promotes small steam turbines: from 500kW upwards!

If I am not mistaken, this state of affairs is likely to end. After 5 years of research a company called “Green Turbine” has developed a micro steam turbine in the range of 1-15 kW. Their 1 kW and 2,5 kW versions are working prototypes and will be rigorously tested.  www.microturbine.eu

The Green Turbine is not only a turbine, but a compact, completely sealed turbo generator. The turbine runs with 30.000 rpm and on account of this high speed is very compact and only 7 kg in weight.
The novel design (patented) and modern materials like plastics gives Green Turbines excellent specifications. The efficiency seems to be as good as steam turbines of a much higher output.
The design is aimed at low production costs. Compared with gas turbines the Green Turbine is almost silent.
A very important feature is the low temperature requirement of the steam; 200 C is enough. So waste heat is an obvious source of energy.

The field of application requires some “out of the box” thinking.

Where do we find a lot of waste heat: cars! Power a Green Turbine with the waste heat of a (hybrid) car and savings of 20% in fuel are easy to get.
How about yachts and small ships?

Micro CHP (Combined Heat and Power) is another obvious application. Better than a heavy Stirling engine or gas engine.

Solar energy? Yes, capture the heat, make steam and your turbine will run. Use the low temperature heat of the turbine to heat your house or swimming pool .

And, yes, also the waste heat of a fuel cell or micro gas turbine can drive Green Turbine.
We closed the circle!