[TRNSYS-users] Outputs of Type 56 !

ts0g . tsogas8 at hotmail.com
Fri Jun 8 08:11:49 PDT 2012



Dear TRNSYS users ,

I have imported a 3d
      model ,from trnsys 3d plug-in for sketchup, into the Simulation Studio. I am using Type56 to generate my building's air temperature ( TAIR ) ,
 and the sensible heating&cooling demand of airnodes ( QHEAT-QCOOL ) . I have created 5 different thermal airnodes and my question is , which type should I 
use as an output in order to retrieve my results, after simulating, in a .txt file so I can process them and compare them with some theoretical measurements concerning 
these specific thermal zones.
Thank you for your help !


      Kind regards,
Kostas 





--Forwarded Message Attachment--
From: d.bradley at tess-inc.com
CC: trnsys-users at cae.wisc.edu
To: ricardo.palomar at hotmail.com
Date: Wed, 6 Jun 2012 14:09:13 -0500
Subject: Re: [TRNSYS-users] Type 1716: ROTARY DESICANT DEHUMIDIFIER


  
    
  
  
    Ricardo,

      Without seeing the input file, its hard to know what the problem
    might be. If you can please send your project to me (directly,
    please do not reply to the entire list) then I can have a look.

    Kind regards,

     David

    

    

    On 6/6/2012 06:03, Ricardo Palomar Calahorra wrote:
    
      
      
        Hello !!!
        

        
        I´m trying to use the type 1716: ROTARY DESICANT
          DEHUMIDIFIER, but I´m having always the same problem, when I
          run the simulation the outputs 8 and 12 (Regeneration air relative humidity,
            and Condensate flow rate) are "0.00". And the outputs 2 and
            3 (Process air outlet humidity ratio, and Process air outlet relative humidity) are
              inconsistent.
        

          
        Exist any problem running this type?
        

          
        Thanks !!!
      
      

      
      

      _______________________________________________
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TRNSYS-users at cae.wisc.edu
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    -- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com
  



--Forwarded Message Attachment--
From: d.bradley at tess-inc.com
CC: trnsys-users at cae.wisc.edu
To: mattia.rio at mail.polimi.it
Date: Wed, 6 Jun 2012 14:14:47 -0500
Subject: Re: [TRNSYS-users] Shading groups


  
    
  
  
    Mattia,

      I think you will have to be a little creative here. Shading
    devices in Trnsys3D are assumed to be opaque as you know so I don't
    think you can define the shading surface in there. You could use
    Type34, which models simple overhangs and/or wingwalls. That model
    also assumes an opaque shader but it gives outputs for various
    shading fractions and view factors. You may be able to use those and
    the unshaded radiation from your weather component to get an
    estimate of the radiation that comes through your not-quite-opaque
    device. Lastly, Type56 allows you to enter a shading factor for any
    given window. You may be able to treat your shaders in that manner.

    

      Unfortunately, there is not a direct way to treat semitransparent
    shaders unless you would care to modify Type34.

    Kind regards,

     David

    

    

    On 6/6/2012 10:11, MATTIA ANDREA RIO wrote:
    Hi!!! i have a little problem with my imported 3d
      model from trnsys 3d plug-in for sketchup.
      

      

      I have posted a picture that show my 3d model in sketchup; so, as
      you can see, all of the triangular surfaces (into red circle), are
      made in perforated corten steel, and i need to give a shading
      coefficient to their, otherwise the  program will do the
      simulations considering the shading surfaces opaque; but actually
      they are not matt.
      

      

      if someone have any ideas about how I can do.....
      

      

      ----------------------------------------------------------------
      

      This message was sent using IMP, the Internet Messaging Program.
      

      

      

      
      

      _______________________________________________
TRNSYS-users mailing list
TRNSYS-users at cae.wisc.edu
https://mailman.cae.wisc.edu/listinfo/trnsys-users

    
    

    -- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com
  



--Forwarded Message Attachment--
From: d.bradley at tess-inc.com
CC: trnsys-users at cae.wisc.edu
To: damien.casetta at gmail.com
Date: Wed, 6 Jun 2012 14:27:41 -0500
Subject: Re: [TRNSYS-users] Water-to-water heat pump - Heat rate to load	control


  
    
  
  
    Damien,

      In my experience, there are relatively few heat pumps available on
    the market that can do what you are trying to do. Most heat pumps
    have a fairly fixed capacity (some have multiple stages) so that
    they have an easier time maintaining a fixed temperature rise than
    they do in maintaining a fixed temperature outlet. There is at least
    one notable exception to this; an air-to-water heat pump that has a
    variable speed compressor that allows it to modulate and maintain a
    target outlet temperature. 

    

      Type927 is a temperature level control device meaning that it is
    looking for inlet water conditions on both sides and for a control
    signal. If you have obtained your heating loads from some other
    software tool, I would recommend that you read them into TRNSYS
    using Type9 and impose them on a water stream using Type682 from the
    TESS Loads and Structures library. I would then place a thermostat
    sensing water return temperature in the loop and I would use its
    output to turn on the loop pump and the Type927 heat pump. You will
    not get a constant supply temperature of course but in reality, a
    single stage (or even multi stage) heat pump can't really give you a
    constant supply temperature; it can only give you a supply
    temperature that hovers around a set point.  

    

      If you are using Type56 to generate your building's heating
    demand, I would take it out of energy rate control (ie turn OFF the
    automatic heating and cooling types in TRNBuild), and allow the zone
    temperatures to float. I would then use a thermostat watching the
    zone air temperature and some kind of delivery device (a fan coil,
    radiant floors, etc.) to deliver the hot water from the Type927 to
    the zone.

    

    Kind regards,

     david

    

    

    On 6/6/2012 12:20, Damien Casetta wrote:
    Hi, 
      

      
      I am trying to handle this problem by controlling the
        temperature. Let me remind you that I want to control the heat
        load of an heat pump in heating mode. 
      

      
      Here is how I am trying to proceed : 
      

      
      - I control the temperature exiting the heat pump
      - I fix a temperature set point (with an aquastat - heating
        mode) at 50 C.  
      - I vary the supply temperature (entering the heat pump)
        according to the heating demand. 
      

      
      The heating demand is based on hourly loads. 
      

      
      What do you think about it? 
      

      
      I am not very satisfied but I will give it a try. I am sure
        there is a much simpler way to do it. 
      

      
      

      
      Thanks in advance for your help. 
      

      
      Best regards,

        

        On 1 June 2012 18:10, Damien Casetta <damien.casetta at gmail.com>
          wrote:

          Hi, 
            

            
            I am modelling a ground-source heat pump system
              including a water-to-water heat pump (type 927), a
              borehole heat exchanger (type 557b) and a building demand
              profile. 
            

            
            I have read a couple of messages in the archives about
              this topic but I haven´t understood correctly the few
              addressing my specific issue. 
            

            
            Here is my point. I assume the heat pump to meet the
              building demand. The aim is then to force the heat pump
              load and observe how the system behaves (COP, ground loop
              fluid temperatures). 
            

            
            I would be able to do this with an external MATLAB code
              (with COP values interpolated from catalog data) but it
              would be a shame not to harness TRNSYS potential (there is
              no need to re-invent the wheel as I read in a previous
              message). 
            

            
            Let me put in other words: how to control a heat pump
              load? 
            

            
            I have read about a trick to handle this, with a "lump"
              temperature but I don't get the idea behind it. Any other
              explanations is welcomed. 
            

            
            

            
            

            
            Thanks in advance,
            

            
            Best regards,
                  

                  
                  

                  
                  -- 

                  Damien Casetta
                  

                  
                  Chalmers
                          University of Technology | Energy
                      and Environment | Exchange student
                  INSA Lyon Génie
                      Energétique et Environnement | Elève ingénieur 
                    

                      +46.7.60.66.31.45

                    
                  +33.6.71.78.03.75
                  

                
          
        
        

        
        

        
        -- 

        Damien Casetta
        

        
        Chalmers
                University of Technology | Energy and
            Environment | Exchange student
        INSA Lyon Génie Energétique et
            Environnement |
            Elève ingénieur 
          

            +46.7.60.66.31.45

          
        +33.6.71.78.03.75
        

      
      

      
      

      _______________________________________________
TRNSYS-users mailing list
TRNSYS-users at cae.wisc.edu
https://mailman.cae.wisc.edu/listinfo/trnsys-users

    
    

    -- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com 		 	   		  
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