[TRNSYS-users] controller type 2

[David Bradley]

Betrand,
   I think you are going to need to use two 
controllers. The first controller will determine 
the flow rate of your collector loop in order to 
maintain a collector outlet temperature of 70C. 
The other controller will determine the flow rate 
on the load side of your heat exchanger in order 
to maintain source side outlet temperature of 
60C. I am also not sure that Type2 is an 
appropriate controller model; Type2 models a 
differential controller that has only two states: 
ON and OFF. In order to modulate your flow and 
maintain an outlet temperature, you will need to 
use a proportional or a PID controller. There are 
some solar collector models in the TESS Solar 
Library that combine a variable speed pump, 
controller, and collector and modulate the 
required inlet flow rate in order to maintain an outlet temperature.
Kind regards,
  David


At 01:50 5/10/2007, tchanche fankam bertrand wrote:
>Dear all,
>i am simulating a system that comprises a 
>subsystem made of a colector loop(ETC collector, 
>pump, flat plate heat exchanger ). i need to to 
>keep the inlet temperature of the collector at 
>60C and the outlet temperature at 70C.
>I would like to know if it is possible to 
>control the system with type 2 and how.
>Thank in advance for your help.
>yours,
>
>
>------------------------
>TCHANCHE FANKAM Bertrand
>
>C/O SUH Christopher
>22 kadmeas-BOTANIKOS
>11855 Athens, GREECE
>mobile:+30 694 295 5952
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