Tag Archives: electricity

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.

http://www.examiner.com/x-23776-Reno-Marketing-for-Renewable-Energies-Examiner~y2009m11d1-Waste-heat-is-the-low-hanging-fruit-of-clean-energy

http://www.electratherm.com/

http://www.greenturbine.eu

Advertisements

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!

www.greenturbine.eu

http://blogs.edmunds.com:80/greencaradvisor/2009/10/jetsons-anyone-micro-turbines-could-give-maxi-boost-to-ev-battery-range.html

WindPipe a gamechanger?

Inventor John R. Tuttle  has developped a new kind of wind energy  converter which might be a good replacer of wind turbine generators. This prototype WindPipe  is quite a bit different from the turbine generators as we know them. It has no rotating parts at all, no long churning blades or propeller and no rotating power generator hidden in a nacelle.

Vertically the  WindPipe  looking more like a crude musical instrument  with a horn-like wind capture head at one end. Because it has no spinning  blades, it  can be integrated into buildings design. It can lie on its side or lie at any angle  or in any other shape.  ‘ The windPipe can be used not only in traditional wind farm tower arrays but inside buildings and even underground with air ducted in from the winds above’  says  inventor John R. Tuttle . ‘ ‘ Windcaptures does not have have to be circularly shaped as with spinning propeller blades, capture  can be rectangular  or any other shape with the air then ducted to the energy converter system for direct energy conversion electricity.’

WindPipes  can be spaced close togheter because  there are no whirling blades.

There is no cut out wind speed. Power output in the WindPipe starts building at about 7 miles per hour of wind speed and climbs from there.  ‘Unless the WindPipe gets destroyed in a bad storm!  Vertical towers are light and easily raised up to 120 feet with a crane. All the electrical components and connections are at the bottom keeping maintenance  costs low. Also the cost of power  from the WindPipe are low. Above 14 mph, the technology is expected to produce energy from 3 to 10 times cheaper than turbines, from $3.30 per MWh to $ 0.3 per MWh, compared to the $10 per MWh of modern turbine wind towers.

It’s sounda bit  incredible but it works. But Tuttle won’t say how it’s work. So pity the inventor who wants to develop the idea into a commercial product. For getting investors interested, you have to disclose at least the principles of your invention.  He has to sign a Non Disclosure Agreement (NDA) but it is not easy to find a truly interested investor  without a tidbit of information to chew on opfront.

Tuttle is master of inventions and patenting. He  is the world leading patentholder (at least 78 patents). He plans to build a 9 meter (30 foot) tall unit that can be expected to produce 900 watts of power in a 22 miles per hour breeze.  The unit could put out as much as 9 kilowatts at a stormy 44 miles  per hour. The prototype should also be prettier in white fiberglass and be more streamlined. The wind capture end will be about 3 meters, almost 10 feet in diameter.

If the WindPipe is really a breakthrough we don’t know yet. Tuttle has  to prove it. Any way there are more  inventions out there waiting to happen.

http://www.green-energy-news.com/arch/nrgs2009/20090064.html

New geothermal heat recovery method

Bron: National renewable energy laboratory
Example of geothermal heat: Hot springs in Nevada. Source: National renewable energy laboratory

Pacific Northwest National Lab has been making progress in using a new method for capturing more heat from the low-temperature of
geothermal resources. Which it is hoped could result in generating  pollution-free electrical energy. A new liquid is used called biphasic fluid, which has the benefit of rapid expansion and contraction capabillities developed by PNNL’s conversion system. The  thermal-cycling  of the biphasic fluid, when exposed to heat and brought to the surface from water circulating in moderately hot, underground rock,  will power a turbine generating electricity.

Scientists added metal-organic heat carriers (MOHC’s)  to aid efficiency, which boost the power generation capacity to near that of a convential steam cycle.
‘Our intention is to enable generation from low-temperature geothermal resources to get a clean energy source without  any greenhouse gas emissions  which is  also a steady and dependable source of power’ said Pete McGrail, PNNL Laboratory. ‘ We accidentily discovered this by research on nanometerials used to capture dioxide from burning fossils fuel’ .

PNNL  plan  to have a functioning  bench-top prototype generating electricity by the end of the year.

http://www.renewableenergyworld.com/rea/news/article/2009/07/new-geothermal-heat-extraction-process-to-deliver-clean-power-generation

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!