[BLDG-SIM] About thermostatic valves in zone equipment

Jeremy Cockroft jeremy at esru.strath.ac.uk
Fri Mar 3 01:53:07 PST 2006


In a previous life, I was involved in the modeling of thermostatic radiator valves.  By this I mean self actuating valves using either a fluid phase change or wax capsule to operate the valve.  If this is what you mean, then it depends if you want to be able to model control instabilities due to the long time constants involved.  If this is not a concern, then I suggest you model as a proportional controller with very wide proportional band - say 5K or so.

We were a commercial company, so nothing was published on this topic, but if you want more detail, I might be able to help you.

Jeremy Cockroft, ESRU, University of Strathclyde.

-----Original Message-----
From: BLDG-SIM at GARD.COM [mailto:BLDG-SIM at GARD.COM] On Behalf Of Pedro Rodrigo
Sent: 03 March 2006 08:36
To: BLDG-SIM at GARD.COM
Subject: [BLDG-SIM] About thermostatic valves in zone equipment

Hi all:
We´re modelling a building with a number of
water-to-air fancoils in each thermal zone.
We have yet built the coils without problems.
However we are not sure about the valves that control
water flow rate. We think that processes such us
histeresis, uncertainties in actuator position or
relation between position and water flow should be
taken into account.
We have lacks of references and documentation about
this.
Do you know something interesting to read about the
matter?
Thanks in advance,
Regards,

Pedro Manuel Rodrigo Cruz
University of Jaen, Spain


		
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