Operating principle
The passive mixing circuit controls the net thermal power passing through the circuit by mixing cold return water (coming from the end unit return pipes) with hot water from the primary production side. In full load operation the 2-way valve is completely opened whereas in partial load conditions the 2-way valves is positioned in function of the process value (measured water temperature) and set point (heating curve). A primary pump is necesarry to achieve flow through the 2-way valve.
Individual components and parameters
- Secondary pump
- 2-way valve
- Balance valve for pump
- Balance valve for primary balancing
Design flow and temperature regime propagation
By running the action "compute design flows" all the design flows are calculated based on the power and temperature regime of the end units. In case where there are multiple types of end units (radiators, floor heating, ...) the supply temperature in regime may differ. The bypass in the passive mixing circuit guarantees a maximum supply temperature (45°C) for the floor heating, because of the mixing point on the supply pipe. Note that the primary temperature difference from the floor heating is larger than that of the radiators, which will influence the design flow.
Related models:
- TOKEN - NjI1fFpqc3BuN3ZZ - Primary regime change