[TRNSYS-users] problem with type 11b

David BRADLEY d.bradley at tess-inc.com
Fri Dec 18 06:33:49 PST 2020

Are you dividing your flow by a simple fraction (80% goes to the boiler 
and 20% goes to recirculation for example) or is the Type11 set up so 
that it tries to maintain a set point temperature like a tempering valve 
might do? The error that you are getting is one that comes when Type11 
is used as a tempering valve but can't achieve the set point because 
both of the inlet temperatures are already above the set point. A little 
additional explanation might help me find a suggestion for how to work 
around the issue.

kind regards,


On 12/18/2020 08:02, Filippo Angeli via TRNSYS-users wrote:
> Good morning,
> simulating the operation of a condensing boiler with a power of 20kW 
> and a setpoint temperature of 50 degrees; I get the following error, 
> which I report later, in type 11b. With this type I divide my flow 
> rate into the boiler flow rate and the recirculation flow rate.
> "The inlet temperature and the heat source temperature have 
> simultaneously exceeded the set point temperature. Gamma has been set 
> to 0 (Mode 4) or 1 (Mode 5)."
> I would like to have your help. Thanks.
> Angeli Filippo
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> TRNSYS-users at lists.onebuilding.org
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Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

d.bradley at tess-inc.com


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