Bio fuels - Optimizing of system composition and design of larger components

The purpose of the project is to ensure a larger distribution of better-working biomass-fired systems for houses. This is done by developing design rules for these systems with an accumulating tank and other supplementary heat supplies. Most systems for biomass firing, which are installed in non-collective heat supplied areas, are supported by subsidies for renewable energy. To get these subsidies the systems need to have an energy and environment approval by the government. In defiance of an often very simple design most systems are able to achieve an efficiency of 80-90%, while the CO emission for the best of the systems is below 100 ppm (10% O_2). A condition of achieving these satisfactory values is that the heat output of the firing system is in the working area of 30 - 100% of the nominal output. Therefore a heating accumulating elements is required in the system. The design rules development by use of dynamic simulation from a commercial available computer programme. Simple rules for all components are developed, based on practical experience. The results are verified by the design of two systems (a magazine and a stoker system) according to the result of the project. The two systems are tested and measured over a period. One of the systems is built so it is possible to connect it with different system solutions