modelEvaporationPulse
Test model for evaporation with pulse signal
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 a pulse signal that switches the coil on and off. The two instances have a different frequency of the on and off signal to illustrate that the reevaporation of mass is larger if the coil short-cycles.
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 |
|---|---|---|---|
| Modelica.Blocks.Sources.Pulse | pulSho | Control signal for short-cycling coil | |
| Evaporation | evaSho | Evaporation model | |
| Modelica.Blocks.Math.RealToBoolean | realToBoolean | ||
| Modelica.Blocks.Sources.Constant | mAir_flow | Air flow rate | |
| Modelica.Blocks.Sources.Constant | TIn | Inlet temperature | |
| Modelica.Blocks.Continuous.Integrator | intSho | Mass of water that evaporates into air stream | |
| Evaporation | evaNor | Evaporation model | |
| Modelica.Blocks.Continuous.Integrator | intNor | Mass of water that evaporates into air stream | |
| Modelica.Blocks.Sources.Pulse | pulNor | Control signal for normal-cycling coil | |
| Modelica.Blocks.Math.RealToBoolean | realToBoolean1 | ||
| Modelica.Blocks.Math.Gain | mWat_flow | Water mass flow rate from air to coil surface | |
| Modelica.Blocks.Math.Gain | mWat_flow1 | Water mass flow rate from air to coil surface | |
| Modelica.Blocks.Sources.Constant | XEvaIn | Inlet water vapor mass fraction |
Contents
| Name | Description |
|---|---|
 Medium |
Revisions
-
August 23, 2012 by Michael Wetter:
First implementation.