PELLEMATIC SMART_e PROJECT
Cozy warmth for the living room and for Domestic hot water and also green electricity from their own pellet boiler - these are the objectives to be achieved with the project ÖkoFEN - Power-generating pellet for single family homes.
The Pellematic Smart_e meets all these objectives and provides ecological and energy-conscious heating and electricity at home.
In the following subitems are displayed the technology, the main project milestones and all relevant information about Pellematic Smart_e.
Meanwhile, the Pellematic Smart_e 0.6 is ready for series production in Austria. In all other countries several pilot projects are currently being implemented.
Pellematic Smart_e 0.6
All information related to the production-ready system (information available only in german)
PELLEMATIC SMART_e – PELLET HEATING WITH STIRLING ENGINE
Structure of the Pellematic Smart_e
This pellet boiler with integrated Stirling engine is a further development of the Pellematic Smart – an accumulator tank with a pellet condensing module and hydraulic unit on the smallest space.
Based on the previous success of the Pellematic Smart boiler, a similar concept has been used on the Pellematic Smart_e, with all the technical components united in a small space. The pellet burner and theStirling engine from Microgen are integrated into an approximately 600-litre accumulator.
The result is the first electricity-producing wood pellet boiler from OkoFEN, which is compactly and attractively presented and requires only 1.5 m² of space.
The combustion concept of the already existing Smart boiler was optimised to encompass the requirements of the Stirling engine, and has been perfectly adapted to make use of the new technology.
To achieve the best possible heat transfer at the heater head of the Stirling engine, which is where the heat is transferred from the flue gas to the Stirling engine, a special inflow unit has been developed.
As the wood pellet fuel is converted to energy in the boiler, there is a subsequent build up of unwanted particles on the heater head. OkoFEN's innovative solution to this is a fully automatic cleaning system, which has been developed for the heater head. This novel cleaning device has already been successfully tested on the OkoFEN test stand.
Why is this CHP system arranged in combination with a heat accumulator?
In addition to the space-saving construction and the reduced heat losses, the integration of a pellet burner and a Stirling module into a heat accumulator also results in optimisation of the operating time. This means that a greater quantity of sustainable electricity can be generated at the same time as the heat accumulator is loaded with heat. The heat accumulator serves as a thermal energy store, which separates the heat generation mechanism from the actual heat consumption. Therefore, the Smart_e can also be operated when electricity is required but there is no heat demand in the building.
For all of the gas-powered CHP systems currently available on the market, for example those by Viessmann, Vaillant and Boesch, external heat accumulator systems are used. The experiences of OkoFEN with the Pellematic Smart boiler has demonstrated that an integrated accumulator has many advantages in relation to the space required and capital investment costs, which is why the Pellematic Smart_e makes use of this novel concept.
MICROGEN STIRLING ENGINE
Microgen Engine Corporation has been working for many years on the development of a free-piston Stirling engine that is suitable for mass production. Since 1995, the enterprise has invested 200 million euros into the development of this concept; efforts that have been paid off with both technological and commercial success. As a result, the Microgen Engine Corporation has been the world's only successful mass producer of Stirling engines with this power range since 2010, when tey first became a commercial viability.
Many world-renowned companies, such as Vaillant and Viessmann also rely on the Microgen Stirling engine and use it in gas micro-CHP systems.
The Microgen Stirling engine produces alternating current (50 Hz) and can provide a maximum power of 1 kW.
How it works
- The displacement piston pushes helium through the regenerator from the head to the cooler.
The spring on the opposite casing at the bottom pushes the piston back upwards.
- The helium is alternately heated and cooled, and as a result it expands and contracts again.
This causes the creation of a pressure wave, which repeats as the cycle begins again.
- The working piston is moved up and down by these pressure waves up and down.
- The magnetic working piston is surrounded by a fixed magnetic coil with copper windings, which means that an alternating current is generated.
This cycle is repeated 50 times per second, generating AC power at 50Hz.
More information about the
MILESTONES IN THE COOPERATION OF MICROGEN ENGINE CORPORATION AND OkoFEN
A challenging project needs strong and experienced partners, which are qualities combined by the partnership between Microgen Engine Corporation and OkoFEN combine these qualities. Two pioneers have joined their forces and exchanged expertise in order to achieve what many others have tried and failed before - the development of a CHP wood pellet electric power plant for the home.