File:GWC czyszczenie smogu.jpg

English: Gravel exchanger - Ground Heat Exchangers (GHE) There are solutions in which a bed of gravel or broken aggregate with granulation of 16-32 or 20-40 (gravel-free exchanger) is constructed in the air flow path, which develops much thermal exchange surface, a large thermal surface causes a large heat capacity of the bed itself and increases its thermal conductivity. For this reason, the correct selection of the bed for the air stream plays an important role. The exchanger is the most effective during cyclic work / regeneration ie 16-12h / 8-12h. With this solution, time should be provided for its regeneration. A good solution, but a bit more expensive, is the Siamese system, where during the operation of one part of the exchanger, the other part is in the regeneration phase. Gravel exchangers must absolutely be protected against the action of water infiltrating the bed, i.e. thermal insulation of the construction film layer. Its bottom must be above the groundwater level. In order not to happen, mixing the gravel with the soil of the original excavation surface is lined with geotextile. The gravel GWC creates small resistance to air flow. It flows at a rate of 0.1 m / s across a few m² of gravel, laminar "seeps" through its entire cross-section. The flow resistance is about 50Pa or +/- as much as through the ceiling anemostat - the recuperator can handle it without an additional fan. In the summer, at full capacity of ŻGWC (because we not only ventilate, but above all, cool everything at home) the resistance of the bed increases to about 120Pa. Here you need a bypass around the recuperator with a 120-150W channel fan with smooth power regulation. Its launch when replacing the summer cartridge in the recuperator. Gravel exchanger is maintenance-free - no pumping of condensate required. The excavation area for its construction for a single-family house is approx. 10-12 m². The width should be 2.5 to max 3m - 3m just to get the air expected parameters eg in the winter to heat from -15C to 0C, in summer from 35C to 20C. This distance is enough for the air to be cleaned of allergens, fungi, and smog - In Rybnik, tests of the smog content before and after the GWC were carried out by the PAN before and after the results of 230μg to 56μg. Another name is the self-cleaning Gravel Filter - moisture condenses in the rain - the water drains and rinses gravel from allergens, fungi