TRNSYSMATLAB

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Type 155 - a new TRNSYS type for coupling TRNSYS
and Matlab Example of using Matlab controllers
with TRNSYS components
W. Keilholz, M. Kummert, P. Riederer
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Origin of TRNSYS

• Originally developed for solar processes at SEL
  (University of Wisconsin)
• First public version was 6.0 in March 1975
• Many recent developments focus on building loads
  and HVAC systems
• Now a reference in multizone building and system
  simulation (type 56)

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Why has TRNSYS survived ?

• General Purpose (from PV cells to cows)
• Flexible (modular)
• General Component Formulation
• Open Source Code no longer restricted to
  FORTRAN
• Documentation
• Model Exchange between users
• Continuous full-time SUPPORT

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Solver-Library Communication
WINDOWS FUNCTIONALITY Online plotting Simulation
control
TRNSYS.EXE
TRNLIB.DLL
SYSTEM COMPONENTS Read data files Process
radiation Component performance Some components
use Windows DDE
kernal
types
TRNSYS BRAIN Reads input file Calls
components Determines convergence
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System Definition in TRNSYS

• Set of Components
• Each component represents a physical structure
• Interconnected in order to accomplish a specified
  task
• Example Solar System
• Collector
• Tank
• Heat Exchanger
• Pump
• Controller

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Black Box Approach

• Requires two unique types of information
• Parameters time-independent quantities
• Inputs time-dependent quantities
• Provides desired variables as Outputs

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System Schematic
, To
.
Auxiliary Heater
m
, Tset
.
Solar Collector
, Ti
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Information Flow
Ti
To
S
Time Dependent Conditions
Solar Collector
Ta
Auxiliary Heater
Integrator
Printer
File containing integrated Qaux results
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Information Flow (2)

• INPUTS are passed to component subroutines.
• OUTPUTS are set by component subroutines.
• TRNSYS kernal directs INPUT-OUTPUT.
• User defines INPUT-OUTPUT connections

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TRNSYS Solver 0

• Successive Substitution (Solver 0 )
• Algorithm
• 1. For each unit, outputs are calculated for the
  given inputs outputs are passed as inputs to
  other units
• 2. As long as the system doesnt converge, step 1
  is repeated
• Many iterations can be necessary
• The original and still most common solution
  method
• Best method for standard problems
• Systems which may cause problems
• Little or no capacitance (energy storage)
• Rapidly changing systems with many discrete
  states

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TRNSYS Tools

• IISiBat
• graphical front-end for TRNSYS
• PREBID
• graphical tool for entering building information
• TRNSED / TRNSHELL
• tool to share simulations with non-users
• environment for building TRNSYS-based
  applications
• SimCad
• CAD tool for building Simulation (add-on product)

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TRNSYS tools SimCad CAD tool for building
simulation

• Object and volume oriented automatically creates
  an internal data model while the user enters the
  building
• Able to read IFC files
• Imports DXF files and allows to convert the lines
  to objects

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SimCadCAD tool for simulation with TRNSYS
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TRNSYS tools TRNSEDExample Application
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TRNSYS Components

• Subroutines
• Generic formulation
• Choose them from a black box library or
• Write them yourself

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Type 155 Calling Matlab

• Implements a link with Matlab
• Matlab is launched at every TRNSYS yimestep as a
  separate process
• The TYPE communicates with the Matlab engine
  through a Component Object Model (COM) interface
• Any Matlab command (including Simulink
  simulations) can be run within a TRNSYS
  simulation.

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Parameters
Type 155 Component configuration
6 parameters
M Inputs
N Outputs
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TRNSYS PROFORMA Sample simulation
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Type 155 Calling Matlab

• Freely available for all registered TRNSYS 15
  users http//sel.me.wisc.edu/trnsys/
• Requires MATLAB and SIMULINK licenses

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Coupling exampleTRNSYS Simbad

• Aim
• Coupling TRNSYS Type 56 with plant / control in
  Simulink
• TRNSYS ? TYPE56 weather data
• SIMBAD ? Control loop
• - Temperature sensor
• - PI Controller
• - Radiator
• - Actuator
• - Valve
• - Pump

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Coupling TRNSYS SIMBADSystem layout
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Coupling example
TRNSYS TYPE56 Time step 1hour
SIMBAD Plant control Time step 10 sec
Data exchange Time step 1hour

• Surface temp.
• Conv. disturbances

Set point temperature
Mean resultant temperature of 1 hour Set point
for TRNSYS
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Coupling example TRNSYS with Simbad
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Coupling exampleExample output