Tag Archives: Green Turbine

Electra Therm’s new waste heat converter

Electra Therm  has developed a technology to convert ‘waste heat ‘into electricity. The Green Machine is enable to create clean energy from  from heat thrown off as a buy product of manufacturing of other operations. It is the first commercially viable heat generator. What Electra Therm’s technology has also in common with geothermal technology is that it requires no fossil fuels and creates no emissions.

Making waste heat is the newest source of clean energy. But it is rarely include as a renewable energy source, because waste heat derives from factories and plants that run on fossil fuels. But it meets defintion of both clean energy generation as well as energy conservation.

The Green Machine has an output of 50 kW of electricity generation, placing them in the small medium size segment of this business.  In the lower output there are currently more creations of  converting waste heat to electricity. For example the Green Turbine   1-15 kW is  a  mCHP solution that uses existing waste heat to produce power, (electricity) heat and/or hot water.  It  can be driven not only fossil fuels, by any fuel type : natural gas, propane, waste heat Biomass, fuel cell, solar PV Thermal.




Both Gas- and Steam to power EV battery range?

Nick Kurczewski is writing about extremely small (gas) turbines, which can extend the travel range of electric cars in his blog on the website of Green Car Advisor. He’s talking about the Dutch company MTT en the Israeli Company EVT Motors, but he forgets to mention Green Turbine BV. Although Green Turbine is mostly suitable for hybrid cars (the turbine can use the waste heat of the motor), it also can be used in electric cars with a gas turbine, because waste heat of a gas turbine can be used to drive Green Turbine.

So, what exactly is the Green Turbine?  Well, it’s a small (slightly larger than a football), lightweight and silent micro steamturbine with an output in the range of 1-15 Kw. It converts steam to electricity and also produces heat in this process. It can be driven by any fuell type (natural gas, propane etc.), waste heat, biomass and fuel cell.

Green Turbine
Green Turbine

The turbine has been developed in the past five years by a small company called Green Turbine BV (it has also a Canadian version which is the company Green Turbine INC. info@greenturbine.net

Green Turbine is not developing a prototype, it actually has a working prototype. The only thing left, is the long term testing which is starting at the end of October.

Green Turbine can extend the efficiency of hybrid cars by 20-30%. As previously mentioned, it captures the waste heat of the engine exhaust and converts it into electricity. We calculated this percentage based on the following:

In hybrid or fuel cell cars about 10% of the waste heat can be recovered and converted to electricity. As waste heat is about 75% of the total energy input of a car, this 10% is substantial. It will boost total efficiency of a hybrid automobile between 20 – 40%.

Imagine what Green Turbine could do in an electric car, when it is placed after a gas turbine!



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!