Re: [TRNSYS-users] Dynamic efficiency

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

Sadjad,

I think the Macro button has you a bit confused.  This button is only used if the model is contained within a TRNSYS macro (a project within a project).  In that case, if the the macro button is checked it would show that input value in the connection window when a connection was made to the macro.  But let's back up one step.  Your model will take for the input the value of the current output that is connected to that input spot.  If an input is not connected to an output from another model, it will retain it's unconnected value (the value you specify in the connection window) for the duration of the simulation.

 

Jeff

 

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Jeff Thornton
President - TESS LLC
22 N. Carroll Street, Madison WI USA 53703
Office: (608) 274-2577  Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton@tess-inc.com

On 11/08/2017 4:52 am, Seyyed Tajdaran via TRNSYS-users wrote:

That's brilliant

 

The thing I am just struggling to follow is, if for instance for a boiler the input value for the boiler efficiency is set and the Macro button is toggled, are we expecting the efficiency to stay fixed during the time? and how the macro is impleneted here. The problem is I can't find the documentation of Boiler's in 2017 version.  

 

On 7 November 2017 at 15:30, Jeff Thornton <thornton@tess-inc.com> wrote:

Sadjad,

 

Absolutely that's how TRNSYS works.  TRNSYS models take time independent values called PARAMETERS and time-dependent values called INPUTS together to calculate the OUTPUTS from the model.  The inputs can be from another model, set to a constant value, read from an external file, set by a function etc.

 

We have several "heating unit" models and they differ on how they calculate the performance.  Most read a performance data file that returns a value based on the inlet operating conditions.

 

Jeff

TESS LLC

Sent from my iPhone

On Nov 7, 2017, at 3:40 AM, Seyyed Tajdaran via TRNSYS-users <trnsys-users@lists.onebuilding.org> wrote:

Hello all

 

I am looking into use TRNSYS for dynamic simulation. However, I am struggling to find out if the software actually works in a dynamic condition. To be specific I would like to know if the efficiency of a heating unit is calculated as a function of the relevant parameters (i.e. time, temperature, pressure)???  

 

 

Warm regards,

Sadjad

--

Sadjad Tajdaran
PhD Candidate | Research Assistant

Oxford Brookes University, School of Architecture, Faculty of Technology Design and Environment

Architectural Engineering Group

JP203, John Payne Building,Headington Campus, Gipsy Lane, Oxford, UK, OX3 0BP

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--

Sadjad Tajdaran
Research Assistant | PhD candidate

Oxford Brookes University,  Faculty of Technology Design and Environment

Architectural Engineering Group and DYNAMO Project Group

JP204, John Payne Building, Headington Campus, Gipsy Lane, Oxford, UK, OX3 0BP

R201, R Building, Wheatley Campus, Wheatley, Oxford, OX33 1HX

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