Buildings.Fluid.HeatExchangers.ThermalWheels.Latent.Validation
Collection of validation models
Information
This package contains validation models for the classes in Buildings.Fluid.HeatExchangers.ThermalWheels.Latent.
Extends from Modelica.Icons.ExamplesPackage (Icon for packages containing runnable examples).
Package Content
| Name | Description |
|---|---|
 BypassDampers
|
Test model for the enthalpy recovery wheel with bypass dampers |
| SpeedControlled
|
Test model for the enthalpy recovery wheel with a variable speed drive |
Buildings.Fluid.HeatExchangers.ThermalWheels.Latent.Validation.BypassDampers
Test model for the enthalpy recovery wheel with bypass dampers
Information
Example for the model Buildings.Fluid.HeatExchangers.ThermalWheels.Latent.BypassDampers.
The input signals are configured as follows:
-
The operating signal uRot changes from
falsetotrueat 72 seconds. - The supply air temperature TSup changes from 273.15 + 30 K to 273.15 + 40 K during the period from 60 seconds to 120 seconds. The exhaust air temperature remains constant.
- The bypass damper position uBypDamPos changes from 0 to 0.2 during the period from 200 seconds to 360 seconds.
- The supply air flow rate and the exhaust air flow rate are constant.
The expected outputs are:
-
The sensible heat exchanger effectiveness
epsSenand the latent effectivenessepsLatare 0 at the beginning. They become positive at 72 seconds and keep constant until 200 seconds. After the 200 seconds, bothepsSenandepsLatdecrease. - Before 72 seconds, the temperature of the leaving supply air is equal to TSup. Likewise, the temperature of the leaving exhaust air is equal to that of the entering exhaust air temperature. The temperatures of the leaving supply air and the leaving exhaust air follow the change of TSup during the period from 72 seconds to 200 seconds. After 200 seconds, the leaving supply air temperature increases and the leaving exhaust air temperature decreases.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Generic | per | per(mSup_flow_nominal=5, mEx... | Performance record for the enthalpy wheel |
Modelica definition
model BypassDampers
"Test model for the enthalpy recovery wheel with bypass dampers"
extends Modelica.Icons.Example;
package Medium = Buildings.Media.Air
"Air";
parameter Buildings.Fluid.HeatExchangers.ThermalWheels.Data.Generic per(
mSup_flow_nominal=5,
mExh_flow_nominal=5,
have_varSpe=false)
"Performance record for the enthalpy wheel";
Buildings.Fluid.Sources.Boundary_pT sin_2(
redeclare package Medium = Medium,
p(displayUnit="Pa")=101325,
T=273.15+10,
nPorts=1)
"Exhaust air sink";
Buildings.Fluid.Sources.Boundary_pT sou_2(
redeclare package Medium = Medium,
p(displayUnit="Pa")=101325+500,
T(displayUnit="K")=293.15,
nPorts=1)
"Exhaust air source";
Modelica.Blocks.Sources.Ramp TSup(
height=10,
duration=60,
offset=273.15+30,
startTime=60)
"Supply air temperature";
Buildings.Fluid.Sources.Boundary_pT sin_1(
redeclare package Medium = Medium,
T=273.15+30,
X={0.012,1 - 0.012},
p(displayUnit="Pa")=101325-500,
nPorts=1)
"Supply air sink";
Buildings.Fluid.Sources.Boundary_pT sou_1(
redeclare package Medium = Medium,
T=273.15+50,
X={0.012,1 - 0.012},
use_T_in=true,
p(displayUnit="Pa")=101325,
nPorts=1)
"Supply air source";
Buildings.Fluid.HeatExchangers.ThermalWheels.Latent.BypassDampers whe(
redeclare package Medium = Medium,
per=per)
"Wheel";
Modelica.Blocks.Sources.Ramp bypDamPos(
height=0.2,
duration=160,
offset=0,
startTime=200)
"Bypass damper position";
Buildings.Controls.OBC.CDL.Logical.Sources.Pulse opeSig(
width=0.8,
period=400,
shift=72) "Operating signal";
Buildings.Fluid.Sensors.TemperatureTwoPort senExhTem(
redeclare package Medium =Medium,
m_flow_nominal=5)
"Temperature of the exhaust air";
Buildings.Fluid.Sensors.TemperatureTwoPort senSupTem(
redeclare package Medium = Medium,
m_flow_nominal=5)
"Temperature of the supply air";
equation
connect(TSup.y, sou_1.T_in);
connect(sou_1.ports[1],whe.port_a1);
connect(whe.port_a2, sou_2.ports[1]);
connect(bypDamPos.y, whe.uBypDamPos);
connect(opeSig.y, whe.uRot);
connect(senExhTem.port_b, sin_2.ports[1]);
connect(senExhTem.port_a, whe.port_b2);
connect(senSupTem.port_b, sin_1.ports[1]);
connect(senSupTem.port_a, whe.port_b1);
end BypassDampers;
Buildings.Fluid.HeatExchangers.ThermalWheels.Latent.Validation.SpeedControlled
Test model for the enthalpy recovery wheel with a variable speed drive
Information
Example for the model Buildings.Fluid.HeatExchangers.ThermalWheels.Latent.SpeedControlled.
This example considers two wheels:
wheUseDefCur employs a user-defined efficiency curve;
wheDefCur employs a default efficiency curve
The input signals are configured as follows:
- The supply air temperature TSup changes from 273.15 + 30 K to 273.15 + 40 K during the period from 60 seconds to 120 seconds. The exhaust air temperature remains constant.
- The wheel speed uSpe changes from 0.7 to 1 during the period from 200 seconds to 360 seconds.
- The supply air flow rate and the exhaust air flow rate are constant.
The expected outputs are:
-
The sensible heat exchanger effectiveness
epsSenand the latent effectivenessepsLat, keep constant before the 200 seconds. After 200 seconds, bothepsSenandepsLatincrease. - The leaving supply air temperature and the leaving exhaust air temperature follow the change of TSup before the 200 seconds. After 200 seconds, the leaving supply air temperature decreases and the leaving exhaust air temperature increases.
-
The power consumption of the instance
wheUseDefCuris higher than that of the instancewheDefCurwhen uSpe is less than 1. The power consumption of those two instances are identical when uSpe equals 1.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| ASHRAE | per | per(mSup_flow_nominal=5, mEx... | Performance record for the enthalpy wheel |
| ASHRAE | perDefMotCur | perDefMotCur(mSup_flow_nomin... | Performance record for the enthalpy wheel with default motor curve |
Modelica definition
model SpeedControlled
"Test model for the enthalpy recovery wheel with a variable speed drive"
extends Modelica.Icons.Example;
package Medium = Buildings.Media.Air
"Air";
parameter Buildings.Fluid.HeatExchangers.ThermalWheels.Data.ASHRAE
per(
mSup_flow_nominal=5,
mExh_flow_nominal=5,
relMotEff(uSpe={0.1,0.6,0.8,1}, eta={0.3,0.8,0.9,1}),
have_latHEX=true,
use_defaultMotorEfficiencyCurve=false)
"Performance record for the enthalpy wheel";
parameter Buildings.Fluid.HeatExchangers.ThermalWheels.Data.ASHRAE
perDefMotCur(
mSup_flow_nominal=5,
mExh_flow_nominal=5,
have_latHEX=true,
use_defaultMotorEfficiencyCurve=true)
"Performance record for the enthalpy wheel with default motor curve";
Buildings.Fluid.Sources.Boundary_pT sin_2(
redeclare package Medium = Medium,
p(displayUnit="Pa")=101325,
T(displayUnit="K")=273.15+10,
nPorts=2)
"Exhaust air sink";
Buildings.Fluid.Sources.Boundary_pT sou_2(
redeclare package Medium = Medium,
p(displayUnit="Pa")=101325+500,
T(displayUnit="K")=293.15,
nPorts=2)
"Exhaust air source";
Modelica.Blocks.Sources.Ramp TSup(
height=10,
duration=60,
offset=273.15+30,
startTime=60)
"Supply air temperature";
Buildings.Fluid.Sources.Boundary_pT sin_1(
redeclare package Medium = Medium,
T=273.15+30,
X={0.012,1 - 0.012},
p(displayUnit="Pa")=101325-500,
nPorts=2)
"Supply air sink";
Buildings.Fluid.Sources.Boundary_pT sou_1(
redeclare package Medium = Medium,
T=273.15+50,
X={0.012,1 - 0.012},
use_T_in=true,
p(displayUnit="Pa")=101325,
nPorts=2)
"Supply air source";
Buildings.Fluid.HeatExchangers.ThermalWheels.Latent.SpeedControlled
wheUseDefCur(
redeclare package Medium = Medium,
per=per)
"Wheel with a user-defined curve";
Buildings.Fluid.HeatExchangers.ThermalWheels.Latent.SpeedControlled wheDefCur(
redeclare package Medium = Medium,
per=perDefMotCur)
"Wheel with a default curve";
Modelica.Blocks.Sources.Ramp wheSpe(
height=0.3,
duration=160,
offset=0.7,
startTime=200)
"Wheel speed";
Buildings.Fluid.Sensors.TemperatureTwoPort senExhTem(
redeclare package Medium = Medium,
m_flow_nominal=5)
"Temperature of the exhaust air";
Buildings.Fluid.Sensors.TemperatureTwoPort senSupTem(
redeclare package Medium = Medium,
m_flow_nominal=5)
"Temperature of the supply air";
equation
connect(TSup.y, sou_1.T_in);
connect(sou_1.ports[2], wheUseDefCur.port_a1);
connect(wheUseDefCur.port_a2, sou_2.ports[1]);
connect(wheSpe.y, wheUseDefCur.uSpe);
connect(senExhTem.port_b, sin_2.ports[1]);
connect(senExhTem.port_a, wheUseDefCur.port_b2);
connect(senSupTem.port_b, sin_1.ports[2]);
connect(senSupTem.port_a, wheUseDefCur.port_b1);
connect(wheDefCur.port_a1, sou_1.ports[1]);
connect(wheDefCur.port_b2, sin_2.ports[2]);
connect(wheDefCur.port_a2, sou_2.ports[2]);
connect(wheDefCur.port_b1, sin_1.ports[1]);
connect(wheDefCur.uSpe, wheSpe.y);
end SpeedControlled;