Description:

The central ventilation unit located in the cold attic is blowing air into the house-distribution system under a constant pressure. The flow control units (connecting each apartment with the house-distribution system) are opening/closing its dampers to get the desired air-flow based on manual flow control of the tenant. The airflow rate is dependent on pressure drop. Thus the fans increase the flow rate in reaction to the opened dampers in order to keep the pre-set pressure drop. Another feature of flow control unit is to keep balance between supply air and return air within the flat. This enhances the airtightness and reduces risk of heat losses through infiltration or exfiltration. When is the airflow adjusted, both inlet and outlet dampers decreasing/increasing the pressure drop proportionally. The flow control unit was placed inside the apartment despite the fact that placement outside in the common staircase would be easier in regards of maintenance. Distribution of air within an apartment is in this variant designed according to cascade-ventilation principle. The fresh air is provided to bedrooms and to a living room. The air is extracted from a kitchen, a bathroom and a toilet. The corridor serves as a transition zone. All ductwork inside the apartment is solely concentrated under the suspended ceiling of the corridor. Thus the living rooms can keep its original height. Inlets and outlets enter rooms simply through the wall, no suspended ceiling is necessary. The number of silencers was reduced from one silencer per supply duct to one central silencer for the complete apartment installation only. This single silencer is actually a junction point created by distribution box itself and coated from inside with scummy “airborne” layer that reduces the sound distribution and crosstalk risk. The ducts are connected to the box in such a way that the ends do not face each other, see attached PDF. In some cases instead of one supply or return semi-rigid duct were used two parallel ducts with a smaller diameter instead, see attached picture. The greater cross-section of a since duct was reduced in order to fit within the suspended ceiling, which was given by width of the flow control unit. Additionally is also reduced the air speed inside each of the ducts. The return-air-diffuser is a simple grill. The supply air diffuser is an end-element of the system, thus is equipped with a dumper for fine adjustment of the air flow. It is used for single-time balancing of housing system and not for frequent adjustments. This final variant VS-02.6 has the same placement of central ventilation unit and building distribution system as the variant VS-01.1 and VS-01.2.