[BLDG-SIM] About thermostatic valves in zone equipment

[answers at healthyheating.com]

Pedro,

If your coils are based on a 20 deg F delta T with 180 deg F fluid
supply temperatures ( variable flow constant temp) you will need valves
with inverse characteristics to the fan/coil (i.e. Logrithmic (eq%) or
modified splits)... constant flow variable temp systems tend to behave
more linear...i.e. 50 flow delivers 50% output.
Ref.: Total Hydronic Balancing, Prof. Robert Petijean.

Best Regards,

Robert Bean, R.E.T.
Registered Engineering Technologist
Professional Services
Corporate Development and Building Technologies

Home of the Carlson – Holohan Industry Award of Excellence
 
Tel.: 403.255.0121
Cell: 403.560.5769
Email: info at healthyheating.com
http://www.healthyheating.com/ 
 
 
-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Pedro
Rodrigo
Sent: Friday, March 03, 2006 1:36 AM
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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