modelPressureDrop_massFlowRate
Validation model for Buildings.Media.Conversions.FlowResistance.pressureDrop_massFlowRate
Extends from Modelica.Icons.Example (Icon for runnable examples).
Information
Validation model for Buildings.Media.Conversions.FlowResistanceFlowWork.pressureDrop_massFlowRate.
The model computes the ratio of pressure drops dpRat_m_flow
when the working fluid is changed from water to a 25% volume fraction
propylene glycol-water mixture, both evaluated at 20°C.
The mass flow rate ratio ratio_m_flow varies linearly from
0.5 to 1.5 over the simulation period of 1 second.
The pressure drop ratio is computed for turbulent flow, i.e., n=2.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Temperature | T | 293.15 | Temperature at which the properties of the media are evaluated |
| Real | n | 1.688 | Flow coefficient n, n=1 for laminar, n=1.688 for turbulent flow |
| Real | dpRat_equalHeatFlowRate | FloRes.pressureDrop_equalHeatFlowRate(n = n) | Pressure drop ratio for equal heat flow rate at turbulent flow |
| Real | dWFloRat_equalHeatFlowRate | FloRes.flowWork_equalHeatFlowRate(n = n) | Flow work ratio for equal heat flow rate at turbulent flow |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Real | ratio_m_flow | 0.5 + time | Ratio of mass flow rates, varies from 0.5 to 1.5 as time goes from 0 to 1 |
| Real | dpRat_m_flow | FloRes.pressureDrop_massFlowRate(ratio_m_flow = ratio_m_flow, n = n) | Pressure drop ratio for turbulent flow |
| Real | ratio_V_flow | 0.5 + time | Ratio of volume flow rates, varies from 0.5 to 1.5 as time goes from 0 to 1 |
| Real | dpRat_V_flow | FloRes.pressureDrop_volumeFlowRate(ratio_V_flow = ratio_V_flow, n = n) | Pressure drop ratio for turbulent flow |
Contents
| Name | Description |
|---|---|
| FloRes |
Revisions
-
May 11, 2026, by Michael Wetter:
First implementation.