Re: [TRNSYS-users] TRNBuild temperature setpoint

[Jeff Thornton <thornton@tess-inc.com>]

Without digging too deep I’m going to guess that you’re seeing a result of TRNSYS output reporting that many people forget.  Simply that TRNSYS reports it’s outputs as the average over the timestep; not the value at the end of the timestep.  So you’re getting the average temperature over the timestep - not the temperature at the end of the timestep - and since you started at 16 C headed to 19 C, it’ll be less than 19.  Substantially less for limited heating power and a bit less for unlimited power.  

Jeff - TESS

Sent from my iPhone

> On Apr 24, 2020, at 7:31 AM, Anthony Rey via TRNSYS-users <trnsys-users@lists.onebuilding.org> wrote:
> 
> 
> 
> Dear TRNSYS users,
> 
> I have a simulation where I feed varying temperature setpoints and constant powers to Type56 in order to control each thermal zone's temperature using the built-in Heating Type Manager. 
> I noticed that the zones' temperature does not reach the given temperature setpoint sometimes although the power used (that is, Type56's output Qsens) is lower than the given power. 
> This phenomenon happens only during the first time step, when the given temperature setpoint goes from 16°C to 19°C. 
> I ran the simulation with unlimited sensible heating power, but I still had the same problem. 
> The simulation runs with a 10 min time-step. 
> Do you have any suggestions?
> Thank you very much!
> 
> Best regards,
> 
> Anthony
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users@lists.onebuilding.org
> http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org