modelDryCoilEffectivenessNTUPControl

Model that demonstrates use of a heat exchanger without condensation that uses the epsilon-NTU relation with feedback control
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Extends from Modelica.Icons.Example (Icon for runnable examples).

Information

This model demonstrates the use of Buildings.Fluid.HeatExchangers.DryCoilEffectivenessNTU. The valve on the water-side is regulated to track a setpoint temperature for the air outlet.

Parameters

TypeNameDefaultDescription
Modelica.Units.SI.TemperatureT_a1_nominal60 + 273.15Temperature at nominal conditions as port a1
Modelica.Units.SI.TemperatureT_b1_nominal50 + 273.15Temperature at nominal conditions as port b1
Modelica.Units.SI.TemperatureT_a2_nominal20 + 273.15Temperature at nominal conditions as port a2
Modelica.Units.SI.TemperatureT_b2_nominal40 + 273.15Temperature at nominal conditions as port b2
Modelica.Units.SI.MassFlowRatem1_flow_nominal5Nominal mass flow rate medium 1
Modelica.Units.SI.MassFlowRatem2_flow_nominalm1_flow_nominal*4200/1000*(T_a1_nominal - T_b1_nominal)/(T_b2_nominal - T_a2_nominal)Nominal mass flow rate medium 2

Components

TypeNameDefaultDescription
Buildings.Fluid.Sources.Boundary_pTsin_2Boundary condition
Buildings.Fluid.Sources.Boundary_pTsou_2Boundary condition
Buildings.Fluid.Sources.Boundary_pTsin_1Boundary condition
Buildings.Fluid.Sources.Boundary_pTsou_1Boundary condition
Buildings.Fluid.Sensors.TemperatureTwoPorttemSenTemperature sensor
Buildings.Fluid.Actuators.Valves.TwoWayEqualPercentagevalValve
Buildings.Controls.Continuous.LimPIDPController
Modelica.Blocks.Sources.PulseTSetTemperature setpoint
Buildings.Fluid.HeatExchangers.DryCoilEffectivenessNTUhexHeat exchanger

Contents

NameDescription
Medium1Medium model for water
Medium2Medium model for air

Revisions

  • December 22, 2014 by Michael Wetter:
    Removed Modelica.Fluid.System to address issue #311.
  • July 3, 2014, by Michael Wetter:
    Changed pressure sink to mass flow rate sink to avoid an overdetermined by consistent set of initial conditions.
  • March 1, 2013, by Michael Wetter:
    Added nominal pressure drop for valve as this parameter no longer has a default value.