Heat recovery in residential ventilation
Ventilation units with a nominal air flow rate of less than 250 m3/h are residential ventilation units (RVUs) and are therefore not subject to the regulations for AHU systems, which have a nominal air flow rate greater than or equal to 1000 m3/h. In the range between 250 and 1000 m3/h, the manufacturer does not have to declare the unit’s intended use.
Residential ventilation units take extract air out of the rooms being ventilated and replace it with fresh air. A heat recovery unit transfers heat – and sometimes also humidity – from the extract air to the supply air (tip 1: heat recovery).
Residential ventilation units have no reheater for the fresh air; therefore, the heat recovery
efficiency has to be high. As a result, it makes sense that rotary heat exchangers and counterflow plate heat exchangers with a temperature efficiency of more than 80% are used.
As the system runs all year round, very low outdoor temperatures also have to be tolerated.
The energy balance is then ensured by internal heat (from the heating system, kitchen, bathroom). During planning, leakage (tip 4: leakage) and condensate (tip 5: condensation in the extract air) must also be considered.
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