[esp-r] controll: collector and floor radiant heating

[Doreen Kalz]

Dear all,

I have a single zone model which should be heated by a slab embedded 
(floor) radiant heating system. As heat source I employ a solar 
collector (component 31).

The pln file is the following:

...
# The following is a list of component connections.
   5          # Total number of connections
# receiving       node  conncn sending          node  diversion
# component              type  component                ratio
   pipe1             1     3     solar             1    1.000 

   slab              1     3     pipe1             1    1.000 

   pipe2             1     3     slab              1    1.000 

   pump              1     3     pipe2             1    1.000 

   solar             1     3     pump              1    1.000 

...

My question concers the control algorithm: I would like to control the 
water supply temperature from the collector and the operative zone 
temperature. So far I prevent the supply water temperatures to fall 
below a certain setpoint by enabling the pump in order not to cool the 
zone during the night.
In my plant network the pump is the only component with a control 
variable, however, it allows just one variable to control. That is 
either the collector or the room temperature.

I was wondering if anyone has an idea how to tackle the problem of 
setting a control taking two setpoint into account.

Thank you very much!

Best regards,
Doreen


-- 
Dipl.-Ing. Doreen Kalz
Dep. Thermal Systems and Buildings
Fraunhofer-Institut für Solare Energiesysteme ISE
Heidenhofstrasse 2, 79110 Freiburg, Germany
Phone: +49(0)761/4588-5403 Fax: +49(0)761/4588-9000
doreen.kalz at ise.fraunhofer.de
http://www.ise.fraunhofer.de