[esp-r] Re: Setting up a comparative flow network control

[Aizaz Samuel]

Hello Lars,

Using multi sensor of loops controller is a way forward:

  1.  Define a dummy connection in your flow network (ideally a connection between nodes that are already linked, the component for this connection should have a high resistance (small area) so that it does not matter much if this connection is open or shut)
  2.  Define an on-off controller. The sensed parameter is the external temperature, the actuated parameter is the connection of step 1 and the control law is ON if node temperature is higher than ambient.
  3.  Define another on-off controller. This time sense ambient temperature and control the connection of step 1 to ON if ambient temperature is higher than set point target.
  4.  Define a multisensor (of loops) controller. This controller senses the state of previously defined control loops instead of physical parameters like temperature, RH etc. and has the ability to perform logical AND/OR/NOT operations on the sensed conditions (loops). Use sensed condition as on/off state of control loop of step 2 AND step 3. The actuator is the connection (window) that you want to control.
  5.  Control more windows with the multisensor of loops controller but as SLAVE of loop defined in step 4 (standard help text explains available options)

I'll try to find and send you an example of this tomorrow.

Having said all this it might be that you don't need the above and it will suffice to put just a simple controller that opens the window if ambient is lower than internal node temperature. You may have to put a period of validity though so that it is active only in the summer.

Regards,
Aizaz
________________________________
From: esp-r-bounces at lists.strath.ac.uk <esp-r-bounces at lists.strath.ac.uk> on behalf of Lars O. Grobe <grobe at gmx.net>
Sent: 13 January 2020 19:56
To: ESP-r List <esp-r at lists.strath.ac.uk>
Subject: [esp-r] Setting up a comparative flow network control

Dear all,

I am just finding my way through the setup of a flow network
representing a natural ventilation setting for a single-sided space. I
made some progress with the door component (which does not contain the
"bidirectional" string and is therefore a bit hard to find when working
with the cook-book) and a multi-sensor to model a user opening windows
when zone temperature is too high, and external temperature is lower
than the target. This seems to work.

What I was not able to solve so far is a behavior where the occupant
would open the window even if the external temperature is higher than
the target, but lower than the zone temperature. This is what I would
expect in case of a non-cooled building.

Is there some whay to trigger a control if the outdoor is lower than the
zone temeprature? Can I do that with multi-sensor, or do I need a
parallel connection for this case?

Best, Lars.


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