BioSol represents a new concept for heat transfer from a stove into a water-based heating system, which combines high efficiency and negligible risks. A solar system is directly coupled to the heating system. The energy demand for space heating and hot water preparation can thereby be 100% covered by renewable energy in terms of firewood and solar energy.Read more
Many people choose to install a wood stove to fight cold weather, given the high level of heat they provide, as measured by a thermometer. Modern houses are, however, built with a low-energy or passive house standards, which creates a mismatch between the instant heat power delivered by conventionally sized wood stoves or fireplaces and the heat demand in the area that is directly exposed to the heat source. This challenge can be solved by installing a heat exchanger /water jacket containing a heat carrier that transports excess heat to an accumulator or a heat store.
The new BioSol concept uses the same principle for heat transfer as the one applied in the AventaSolar solar collector system. A water jacket is connected to the stove and heat is transferred from the water jacket to an unpressurised heat store (accumulator). The water jacket will only be filled with water when heat should be transferred. The transfer rate is flow-modulated and dynamically controlled by the temperatures in the stove and the hydraulic system. If the heat carrier is approaching boiling temperature, the circulation pump stops and the heat carrier drains back to the heat store. The accumulated heat can be used for heating other parts of the building and/or for preparation of domestic hot water. By keeping the combustion power at the convenient level, emission of unpleasant gases and particles to the environment will be acceptable.
Existing solutions that contain a water jacket coupled to a stove are all based on systems in which water is under static pressure. One consequence of this is that there is a certain risk of overheating, boiling and increased pressure in the system. The new concept has a built-in safety feature, as the heat store is maintained at atmospheric pressure and is only heated when the thermal conditions are acceptable and safe. If not, the water jacket will be in dry state. Drain-out will also occur during an electric power failure.