KWB is a very serious manufacturer of Austrian wood-burning boilers. In recent years, for example, it has been offering automatic boilers with pellets or shredded wood of high quality and performance.
KWB SPM module mounted on KWB automatic pellet boiler
This weekend, during an exhibition, I had the chance to speak with the boss Benelux KWB. I quickly connected to the SPM which interested me strongly for a few months.
Unfortunately, the reality is far from the effects of flyer ads and media articles that are usually copied from press releases.
To be honest, he strongly believes that the kWB wood stirling cogenerator will never come out. Reasons mentioned: high investment price and delicate maintenance, resulting in a very risky return on investment. This is particularly related to problems of fouling of the exchanger ... dropping the performance of the module.
In probability (unlikely) marketed for the price of one module would be between € 5 7000 and 1 to 2 kW for electricity, which seems reasonable but say 0.10 € per kWh, the module should turn in the best cases (5000 € for 2kWe): 25 000h for profitability by assuming free pelletswhich of course is far from being the case!
KWB is therefore working on something much more promising according to him that we will talk a lot soon: a cogeneration micro wood gasifier that would completely replace the boiler!
The price and performance of this cogenerator (5kW at least) would make it much more interesting econologically speaking!
According to Jancovici, the gasification of wood is the electricity generation process that has the best overall energy efficiency due to the non-transformation and limited transport of the fuel and this despite a rather poor performance of the apparatus.
Learn more and discuss about forums: wood stirling cogenerators