modelAirCurtainSimplified
Ideal model for the usage of an air curtain in the context of low order retail zones
Information
Overview
This is an ideal model of an air curtain. It accounts for additional heat losses through an air curtain in the entrance zone.
It accounts for an ideal temperature mixing of the ventilation air with the air curtain air.
Assumptions
Ideal mass balance: All air flow rate going outside through the entrance will be replace by ambient air flow going inside. This is mainly described by the air curtain efficiency. It mainly describes the share of total airflow of the air curtain staying inside.
Ideal temperature mixing: Ideal mixing of two air flows with different temperatures
-
Novmeber, 2018 by Michael Mans:
Model implemented
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.VolumeFlowRate | V_flowAirCur | 5 | Design volume flow rate of the air curtain |
| Modelica.Units.SI.TemperatureDifference | TAddAirCur | 5 | Temperature increase over the air curtain |
| Real | etaAirCur | 0.73 | Efficiency of the air curtain |
| Modelica.Units.SI.Density | rho | 1.25 | Air density |
| Modelica.Units.SI.SpecificHeatCapacity | c | 1000 | Specific heat capacity of air |
| Modelica.Units.SI.Temperature | TBou | 287.15 | Threshold of the ambient temperature when aircurtain becomes active |
| Modelica.Units.SI.Power | PAirCur | 27500 | The thermal Power of the air curtain, simplified use |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Utilities.Psychrometrics.MixedTemperature | mixedTemperature | ||
| Modelica.Blocks.Interfaces.RealInput | TAmb | Ambient airtemperature in K | |
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_b | port_b | heat port for heat transfer | |
| Modelica.Blocks.Interfaces.RealOutput | Power | Power used by the air curtain | |
| Modelica.Blocks.Interfaces.RealInput | schedule | Signal for the schedule |