modelEvaporationPulse
Test model for evaporation with pulse signal
Extends from Modelica.Icons.Example.
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.