recordGeneric
Extends from Modelica.Icons.Record (Icon for records).
Information
Record that contains performance parameters for air filters.
It is used as a template of performance data for the filter models in Buildings.Fluid.AirFilters.
The default value for the flow exponent is set to m=0.85, which is the average of
the inverse of the value a in Li et al., 2022.
The filter flow resistance model increases the pressure drop based
on the mass accumulated in the filter. This is computed in
Buildings.Fluid.AirFilters.BaseClasses.PressureDropWithVaryingFlowCoefficient
using the input dpCor = b^M, where M is the dimensionless ratio of the mass that is accumulated,
with M=0 for a clean filter and M=1 for a filter that accumulated the mass mCon_max.
If dpCor=2,
at the nominal mass flow rate m_flow_nominal,
there will be twice the pressure drop
compared to dp_nominal.
Hence, the achieve this, set b=2.
References
Qiang Li ta al., (2022). Experimental study on the synthetic dust loading characteristics of air filters. Separation and Purification Technology 284 (2022), 120209.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | m | 0.85 | Flow exponent, so that m_flow_nominal/ dp_nominal^m = m_flow/ dp^m. Set m=0.5 for turbulent, m=1 for laminar |
| String[:] | namCon | {"CO2"} | Contaminant names |
| Buildings.Fluid.AirFilters.Data.Characteristics.FiltrationEfficiencyParameters[size(namCon, 1)] | filEffPar | Filtration efficiency of each contaminant versus the relative mass of all captured contaminants | |
| Real | b | 2.0 | Resistance coefficient (multiplier for pressure drop if filter is fully dirty) |
| Nominal condition | |||
| Modelica.Units.SI.MassFlowRate | m_flow_nominal | Nominal air mass flow rate | |
| Modelica.Units.SI.PressureDifference | dp_nominal | 200 | Nominal pressure drop |
| Filter accumulated mass | |||
| Modelica.Units.SI.Mass | mCon_max | Maximum mass of the contaminant that can be captured by the filter | |
| Modelica.Units.SI.Mass | mCon_start | 0 | Initial contaminant mass of the filter after replacement |
Revisions
-
June 27, 2023, by Sen Huang:
First implementation.