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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@hotmail.com From: trnsys-users-request@cae.wisc.edu Subject: TRNSYS-users Digest, Vol 105, Issue 16 To: trnsys-users@cae.wisc.edu Date: Tue, 17 Sep 2013 12:00:02 -0500 Send TRNSYS-users mailing list submissions to --Archivo adjunto de mensaje reenviado-- From: d.bradley@tess-inc.com To: trnsys-users@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:
-- *************************** 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@tess-inc.com http://www.tess-inc.com http://www.trnsys.com --Archivo adjunto de mensaje reenviado-- From: stefano.lazzari@unibo.it To: trnsys-users@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 --Archivo adjunto de mensaje reenviado-- From: mali@masdar.ac.ae To: trnsys-users@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@cae.wisc.edu [mailto:trnsys-users-bounces@cae.wisc.edu] On Behalf Of Stefano Lazzari
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 |