[TRNSYS-users] TRNSYS-users Digest, Vol 105, Issue 16

Tue Sep 17 10:19:34 PDT 2013

Ing. Mydory O. Nakasima L.
Centro de Estudios de las Energías Renovables del Instituto de Ingeniería
Universidad Autónoma de Baja California, Campus Universitario. 
Blvd. Benito Juárez y calle de la Normal s/n, Col. Insurgentes Este 21280. 
Mexicali, Baja California, México. 
Tel (686) 2-35-68-06 
E-mail: mydory.nakasima at hotmail.com

From: trnsys-users-request at cae.wisc.edu
Subject: TRNSYS-users Digest, Vol 105, Issue 16
To: trnsys-users at cae.wisc.edu
Date: Tue, 17 Sep 2013 12:00:02 -0500

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--Archivo adjunto de mensaje reenviado--
From: d.bradley at tess-inc.com
To: trnsys-users at cae.wisc.edu
Date: Mon, 16 Sep 2013 16:24:41 -0500
Subject: Re: [TRNSYS-users] Type 1716: ROTARY DESICANT DEHUMIDIFIER - Maximum air flow rate?

    Marcus,

      Make sure that you are using a short timestep (1-5 minutes) and
    that there is enough thermal capacitance in your flow loops. It may
    be that 10000 kg/h of air flowing through the device in the course
    of one time step is causing the system to be unstable. There was a
    recent post on this forum concerning a cooling tower connected to an
    absorption chiller that turned out to be exactly the same problem;
    far too much energy transferred in a system with far too little
    capacitance for the time step selected. The time step has to be
    shorter than the time constant of your system.

    Kind regards,

     David

    On 9/15/2013 08:36, Marcus wrote:

        I am running type 1716. When I run with 1000 kg/hr flow, it
          simulates fine. When I increase to 10000, it causes
          psychometric SAT error  at -273K. 

        So far, I will use the wheel at 1/10 the flow, and then multiply
        after the wheel to get back to our design flow, just wondering
        if this is a known bug or I suppose the model isn't valid at
        such a flow rate? 

        Cheers,

        Marcus

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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

--Archivo adjunto de mensaje reenviado--
From: stefano.lazzari at unibo.it
To: trnsys-users at cae.wisc.edu
Date: Tue, 17 Sep 2013 11:24:04 +0200
Subject: [TRNSYS-users] TRNSYS3D plugin & SketchUp 8: surface recognition	problem

Dear Forum,I am a new user of TRNSYS 17 and SketchUp 8. After creating the geometry within SketchUp (paying attention to draw always “inside” each activated zone) I saved both .skp and .idf files without getting error messages. Then, I opened the .skp file in SkethUp to proceed with the matching of adjacent surfaces. However, when I activate a zone some (many) surfaces are not recognized by the Object Info Tool (they can be selected on screen but are simply not seen by the Object Info Tool: the area showing Object Inputs properties is blank and the gray text “No EnergyPlus object selected” appears). Where I am wrong? Since the geometry is quite complicated, I hope I do not need to rebuild it from scratch…Thank you very much for your help.Regards, Stefano Lazzari         Dr. Eng. Ph.D. Stefano Lazzari
Department of Industrial Engineering (DIN)
School of Engineering and Architecture, University of Bologna
Viale del Risorgimento 2, I-40136 Bologna, Italy
Tel. [+39] 051 2093383     Fax [+39] 051 2093296
Homepage: http://www.unibo.it/docenti/stefano.lazzari
E-mail: stefano.lazzari at unibo.it

--Archivo adjunto de mensaje reenviado--
From: mali at masdar.ac.ae
To: trnsys-users at cae.wisc.edu
Date: Tue, 17 Sep 2013 13:44:44 +0400
Subject: Re: [TRNSYS-users] TRNSYS3D plugin & SketchUp 8: surface recognition	problem

You probably need to open .idf file in sketchup instead of .skp file. Thanks,Tauha From: trnsys-users-bounces at cae.wisc.edu [mailto:trnsys-users-bounces at cae.wisc.edu] On Behalf Of Stefano Lazzari
Sent: Tuesday, September 17, 2013 1:24 PM
To: trnsys-users at cae.wisc.edu
Subject: [TRNSYS-users] TRNSYS3D plugin & SketchUp 8: surface recognition problem Dear Forum,I am a new user of TRNSYS 17 and SketchUp 8. After creating the geometry within SketchUp (paying attention to draw always “inside” each activated zone) I saved both .skp and .idf files without getting error messages. Then, I opened the .skp file in SkethUp to proceed with the matching of adjacent surfaces. However, when I activate a zone some (many) surfaces are not recognized by the Object Info Tool (they can be selected on screen but are simply not seen by the Object Info Tool: the area showing Object Inputs properties is blank and the gray text “No EnergyPlus object selected” appears). Where I am wrong? Since the geometry is quite complicated, I hope I do not need to rebuild it from scratch…Thank you very much for your help.Regards, Stefano Lazzari         Dr. Eng. Ph.D. Stefano Lazzari
Department of Industrial Engineering (DIN)
School of Engineering and Architecture, University of Bologna
Viale del Risorgimento 2, I-40136 Bologna, Italy
Tel. [+39] 051 2093383     Fax [+39] 051 2093296
Homepage: http://www.unibo.it/docenti/stefano.lazzari
E-mail: stefano.lazzari at unibo.it 		 	   		  
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