modelNoAHU
No AHU
Extends from AixLib.Airflow.AirHandlingUnit.BaseClasses.PartialAHU (Defines necessary parameters and connectors).
Information
This model can be seen as
a dummy. Connectors exist due to partialAHU but outputs are zero and
inputs do not have any effect. As a conclusion it is easier to choose
whether an AHU exist in a building or not. For an example see
AixLib.Building.LowOrder.Examples.MultizoneExample.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Settings for State Machines | |||
| Real | clockPeriodGeneric (from PartialAHU) | 1800 | time period in s for sampling (= converting time-continous into time-discrete) input variables. Recommendation: half of the duration of one simulation interval |
| AHU Modes | |||
| Boolean | heating (from PartialAHU) | true | Heating Function of AHU |
| Boolean | cooling (from PartialAHU) | true | Cooling Function of AHU |
| Boolean | dehumidificationSet (from PartialAHU) | if heating and cooling then true else false | Dehumidification Function of AHU (Cooling and Heating must be enabled) |
| Boolean | humidificationSet (from PartialAHU) | if heating and cooling then true else false | Humidification Function of AHU (Cooling and Heating must be enabled) |
| Boolean | HRS (from PartialAHU) | true | Is a HeatRecoverySystem physically integrated in the AHU? |
| Boolean | use_Vflow_in_extractAir (from PartialAHU) | false | If incoming volume flow of outdoor/supply air should not equal the volume flow of extract air, set this parameter to true |
| Settings AHU Value | |||
| Real | BPF_DeHu (from PartialAHU) | 0.2 | By-pass factor of cooling coil during dehumidification. Necessary to calculate the real outgoing enthalpy flow of heat exchanger in dehumidification mode taking the surface enthalpy of the cooling coil into account |
| Real | efficiencyHRS_enabled (from PartialAHU) | 0.8 | efficiency of HRS in the AHU modes when HRS is enabled |
| Real | efficiencyHRS_disabled (from PartialAHU) | 0.2 | taking a little heat transfer into account although HRS is disabled (in case that a HRS is physically installed in the AHU) |
| Fans › Constant Assumptions | |||
| Modelica.Units.SI.Pressure | dp_sup (from PartialAHU) | 800 | pressure difference over supply fan |
| Modelica.Units.SI.Pressure | dp_eta (from PartialAHU) | 800 | pressure difference over extract fan |
| Modelica.Units.SI.Efficiency | eta_sup (from PartialAHU) | 0.7 | efficiency of supply fan |
| Modelica.Units.SI.Efficiency | eta_eta (from PartialAHU) | 0.7 | efficiency of extract fan |
Connectors
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Boolean | dehumidification (from PartialAHU) | ||
| Boolean | humidification (from PartialAHU) | ||
| Modelica.Blocks.Sources.Constant | dummyPhi_supply | ||
| Modelica.Blocks.Sources.Constant | zeroVFlowOut | ||
| Modelica.Blocks.Sources.Constant | dummyT_supplyAirOut | ||
| Modelica.Blocks.Sources.CombiTimeTable | zeroPowerElAndHeat1 |
Revisions
-
February, 2016 by Philipp Mehrfeld:
Model implemented