GREEN TURBINE^tm develops a small light weight turbo generator, having a relatively high efficiency. This micro turbo generator is a compact steam turbine with an output in the range of 1-15 kW. Up till now, turbines in this small size did not exist.

The advantages related to the other types of generators are:

• high power to weight ratio
• silent operation
• no vibrations
• straight forward rugged design
• long service intervals
• low cost
• external combustion, fit for all types of fuel
• clean combustion, no pollution by lubricants
• very flexible in electric power type: AC, DC, 1 or 3 phase, voltage, frequency

The Turbine will need a suitable steam generator and condenser for proper operation.

The weight of a GREEN TURBINE^tm of 2,5 kW output is approximately 7 kg, The length is 25 cm, diameter is 19 cm.

Steam pressure is 5,2 bar absolute, condenser pressure is 0,1 bar.
A higher condenser pressure (0,25 bar) is possible but output and efficiency will be lower.
Temperature of the steam is 200 C.

The generators deliver 3 phase AC, frequency 2000 Hz. After rectification the power is fed to a DC/AC converter, capable of conversion to the desired output (e.g. 120 VAC/60 Hz). The smallest size of the GREEN TURBINE^tm will deliver 1 kW, the largest size 15 kW.

The modern design (patent pending) does not need guide blades and gears, increasing reliability and efficiency. Losses are further reduced by using a near vacuum for the turbine wheels and generators.

The main advantages are:

• Low weight
• Low cost
• Low maintenance
• Long life
• Low noise, low vibration

The high speed, about 30.000 rpm, makes a very compact machine.

The use of a condenser results in a closed feedwater/steam circuit. The heat, released in the condenser, can be used for heating or chilling.

The GREEN TURBINE^TM is a generator using external combustion, electricity can be generated with every available fuel. External combustion makes its possible to control combustion and therefore emission levels to a very high degree. As the temperature of the steam is relatively low (200 C), waste heat can often be used to fire the turbine, enabling combined Cycle applications with the turbine as second stage. This type of application enhances total efficiency.

A CHP domestic heater with a GREEN TURBINE^TM can have an overall effiency of 95% or higher and will save 1 ton CO2 annually. That is because part of the electricity we need in a household is self-generated and not purchased from the grid. Public power plants generate electricity with an efficiency of approx. 45%. So 55% of the energy is waste heat, dumped in the environment. The fossil fuel, associated with this 55% waste energy, is converted to CO2 and can be saved if we use CHP. If all 80 million households in the US use CHP units, 80 million tons CO2 annually will be saved. This represents a huge decrease in CO2 output, not only in absolute terms but also relatively.

Another benefit is the fact that 80 million CHP units, having even a small capacity of 1 kW each, represents a total capacity of 80 gigawatt. That is the capacity of 80 large conventional power plants. Those plants, otherwise needed for satisfying increasing demand, will not be built. The corresponding power infrastructure, such as transmission lines, transformer stations etc. are also unnecessary. This represents large capital costs savings and less environmental impact.

In a number of countries, subsidies are available to promote the use of domestic CHP units. This can be a subsidy for investment, tax, or the price for power being fed back into the grid. Those subsidies can have a major impact upon the speed of market penetration.