modelEvaporationFlowReversal
Test model for evaporation with zero flow and flow reversal
Extends from Modelica.Icons.Example (Icon for runnable examples).
Information
This example illustrates the evaporation of water vapor that accumulated on the coil. Input to the model is an air mass flow rate that is first positive, then ramps down to a negative value, and eventually ramps up to zero where it remains for a while.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Fluid.DXSystems.Cooling.AirSource.Data.Generic.BaseClasses.NominalValues | nomVal | Nominal values for DX coil | |
| Modelica.Units.SI.MassFraction | XEvaIn_nominal | Buildings.Utilities.Psychrometrics.Functions.X_pSatpphi(pSat = Medium.saturationPressure(nomVal.TEvaIn_nominal), p = nomVal.p_nominal, phi = nomVal.phiIn_nominal) | Mass fraction at nominal inlet conditions |
| Modelica.Units.SI.MassFraction | XEvaOut_nominal | XEvaIn_nominal + (1 - nomVal.SHR_nominal)*nomVal.Q_flow_nominal/nomVal.m_flow_nominal/Medium.enthalpyOfVaporization(293.15) | Nominal air outlet humidity |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Evaporation | eva | Evaporation model | |
| Modelica.Blocks.Sources.BooleanConstant | offSignal | ||
| Modelica.Blocks.Sources.TimeTable | mAir_flow | Air flow rate | |
| Modelica.Blocks.Sources.Constant | TEva | Inlet Temperature | |
| Modelica.Blocks.Continuous.Integrator | int | Mass of water that evaporates into air stream | |
| Modelica.Blocks.Sources.Constant | mWat_flow | Water flow rate added into the medium from the coil model (without reevaporation flow rate) | |
| Modelica.Blocks.Math.Gain | gain | ||
| Modelica.Blocks.Sources.Constant | XEvaIn | Inlet water vapor mass fraction |
Contents
| Name | Description |
|---|---|
 Medium |
Revisions
-
August 25, 2012 by Michael Wetter:
First implementation.