| The VAV_MVL
system configuration implements the layered Model+View
testing architecture for the HVAC example.
The RECORDER and CTRL
devices encapsulate the functionality of the HMI layer of the
architecture. The SP (setpoint) output of the FACEPLATE
is wired to the DAMPER_ACT multicast publisher block to
provide manual control of the Variable Air Volume (VAV) damper
actuation:
- When SP > 67%, the VAV motor moves to open the
damper.
- When SP < 33%, the VAV motor moves to close the
damper.
- When 68% > SP > 32%, the damper remains in
its current position.
The VIEW device of the VAV_VIEWL configuration is replaced by the ZONE
device encapsulating the functionality of both the Model and View
layers:
- As before, there are two instances of the specialized VIEW_PANEL resource type to provide
the necessary layout of View elements for the HVAC example.
- In addition, the MODEL resource of the ZONE
device contains the models for the room and the VAV (Variable Air
Volume) unit as instances of the ZONE_MDLL
and VAV_MDLL types, respectively.
- The simulation is run at 10 times real time by setting the DT
parameter of the simulation clock (VAV_CLK) to t#100s
and the DT parameter of the DAMPER block to t#1s.
- The ROOM block is updated ten times more slowly
than the DAMPER block, since the zone characteristic time is
more than an order of magnitude greater than the damper valve
actuation time.
- Since the RECORDER block is triggered by the
publication of the TEMP output of the ROOM block,
each point plotted on the recorder represents 10 seconds of simulated
time.
This
animation shows typical results of running this simulation
configuration.
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