.Buildings.Fluid.HydronicConfigurations.ActiveNetworks.Diversion .Buildings.Fluid.HydronicConfigurations.ActiveNetworks.DiversionThis configuration (see schematic below) is used for constant flow primary circuits and variable flow consumer circuits where the consumer circuit has the same supply temperature set point as the primary circuit.
The following table presents the main characteristics of this configuration.
| Primary circuit | Constant flow |
| Secondary (consumer) circuit | Variable flow |
| Typical applications | Single heating or cooling coil served by a constant flow circuit |
| Non-recommended applications |
DHC systems due to the significant recirculating primary flow rate at low load Heating systems with condensing boilers for the same reason |
| Built-in valve control options | No built-in controls |
| Control valve selection |
β = ΔpA-AB /
(Δp2 + ΔpA-AB) =
ΔpA-AB /
(Δp1 - ΔpAB-b1) The valve is sized with a pressure drop of Δp2 for a mass flow rate equal to the consumer circuit design flow. |
| Balancing requirement | The bypass balancing valve is not needed in most cases. If the valve has a low authority and the consumer circuit has a high pressure drop (compared to the primary pump head) then a bypass balancing valve should be used and sized so that ΔpJ-B + ΔpB-AB = Δp2 + ΔpA-AB for a mass flow rate equal to the consumer circuit design flow. |
|
Lumped flow resistances include (With the setting use_lumFloRes=true.)
|
Direct branch: control valve direct branch val.res1
and whole consumer circuit between b2 and a2Bypass branch: control valve bypass branch val.res3
and bypass balancing valve res3
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See the example Buildings.Fluid.HydronicConfigurations.ActiveNetworks.Examples.DiversionOpenLoop for additional comments regarding the need for a balanced bypass.