[esp-r] Re: Control and output of hvac

[Achim Geissler]

Dear Michael

 

what you write sounds very interesting. However, one aspect I do not
understand. Why do you need below-time-step information, if what you are
interested in is a controller that simulates "human adjustment". For good
simulation results - especially with a plant included - you will probably
need at least 10 time steps per hour (6 min intervals) and can easily go
below this ...

 

Best regards

Achim

 

From: esp-r-bounces at lists.strath.ac.uk
[mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of Michael Dan B. Usman
Sent: Mittwoch, 14. Oktober 2009 19:25
To: Jon Hand; esp-r at lists.strath.ac.uk
Subject: [esp-r] Re: Control and output of hvac

 

thanks a lot! i will be looking into what i want.
just as what you have raised, i am still unsure of which to control (ideal
zone or plant component).
i am aware of the result that i want though, to have a feedback system
between the zone temperature and the controller. and having such a system, i
would like to see how they both interact per iteration before going on to
the next time step. a graphical output of the overshoot and how fast the
controller settles to the setpoint.

the controller i have in mind so far is a self-adjusting PID, that simulates
how a human being would adjust the temperature manually. please pardon my
lack of knowledge in terms of the HVAC system as i am an electrical
engineer. all i get to think about is adjusting the temperature. as i have
read in numerous papers, books, from the basic simulations, and exemplars, i
may need to pinpoint certain components in the HVAC to have a more robust
control system.

hope to hear from the list again because surely i will be having a lot more
questions. thanks!


-----Original Message-----
From: Jon Hand [mailto:jon at esru.strath.ac.uk]
Sent: Wed 10/14/2009 6:53 PM
To: Michael Dan B. Usman; esp-r at lists.strath.ac.uk
Subject: RE: [esp-r]  Control and output of hvac


It is possible to take advantage of the open source nature of
ESP-r and add in your own controller into the source code and
of course, once you are satisfied with the new functions you
can share your improvements with others in the ESP-r community.

You did not specify whether you wanted to impose a new kind of
control for a detailed component in a plant network or whether
you wanted to introduce a new ideal zone control.  Either
option can be implemented within the source code AND you
will need to do some background research in order to
make the source code changes.

First, go to the ESRU web site and the download page
for ESP-r and locate the developers guide.  This provides
a number of hints for working with the source code
of ESP-r.  You will want to check out the ESP-r source
development_barnch using Subversion (the current
repository is:
https://espr.svn.cvsdude.com/esp-r/branches/develoment_branch)

While you are on the web site get a copy of the current
ESP-r cookbook and review it.  There are also many exemplar
models which can be run and you can then use the results
analysis module to look at graphs or tables etc. of performance
from these models.

You second task is to carefully describe in as much detail as
possible  (in a form that can be emailed) the control which you
would like to implement.  What does it sense, what does
it act on, what logic is releated to the control.  Tell us more
about the iteration that you think is required. Send that out
to the list to see if others might have an intereste in working
with you or have advise to offer.

It might be possible to make limited changes in an existing
controller to do what you want.  Spend some time looking
at the existing controls in the exemplars as well as the
description of controls in the Cookbook.

-Jon Hand
________________________________________
From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.uk] On
Behalf Of Michael Dan B. Usman [mdbusman at wesm.ph]
Sent: 12 October 2009 04:52
To: esp-r at lists.strath.ac.uk
Subject: [esp-r]  Control and output of hvac

Hello,
Just want to ask a few questions...

1. Can I control the hvac using a controller I design so I can do
iterations?
2. How do I call the simulator and access the data?
3. How do I interface with the simulator if I were to design my own
controller?
4. How can I access results for each iteration per time step (Temp of zone,
flux of zone, ambient temp, solar radiation, etc.)

Thanks!







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