[TRNSYS-users] air Density in TRNBuild

[Mohamed Ayman]

Hi Wang
The air density changes with temperature in Trnbuild.
Best Regards
Ayman Mohamed

From: trnsys-users-bounces at cae.wisc.edu [mailto:trnsys-users-bounces at cae.wisc.edu] On Behalf Of ??
Sent: Wednesday, November 02, 2011 1:14 PM
To: trnsys-users at cae.wisc.edu
Subject: [TRNSYS-users] air Density in TRNBuild

Dear all,

    Which experts can tell me a question about air density?

    In TRNbuild  PROPERTIES about air density 1.2 kg/m^3: Is it a initial value? If outdoor temperature changes in TrnFlow, this air density value will change as the teperature or it is a constant?

   Thanks!

    wang



2011/11/1 <trnsys-users-request at cae.wisc.edu<mailto:trnsys-users-request at cae.wisc.edu>>
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Today's Topics:

  1. Re: Information (David BRADLEY)


---------- 已转发邮件 ----------
From: David BRADLEY <d.bradley at tess-inc.com<mailto:d.bradley at tess-inc.com>>
To: "Adriana Gómez Aldana" <adrigomezaldana at gmail.com<mailto:adrigomezaldana at gmail.com>>
Date: Tue, 01 Nov 2011 11:35:52 -0500
Subject: Re: [TRNSYS-users] Information
Adriana,
  I had thought that I sent a response about this. In case it did not get to you, here it is again:

...
  It would help to know a bit more about the configuration of your system: what are you drying, is the material in a big lump, is it spread out on shelves, is it moving, does it occupy most of the available space in the chamber or a comparatively small part of the space, etc.)

  I think you could probably use the Type56 multi-zone building model for the drying chamber itself.

  I would guess that you would need to write a new model for the material that you are drying. If the material is quite spread-out then this might be easily enough characterized by a first-order differential equation and you even might be able to use Tess Type693. Type693 is intended to model a thermal lumped capacitance that heats and cools according to a first-order differential equation but I imagine that pricipals are basically the same whether you are talking about thermal capacitance or moisture capacitance.

  If the product is not spread out, if important moisture gradients develop within it as it dries, or if its drying process is exothermic (like it is for compost) then I think you would need to write your own model or collaborate with someone who could write the model for you. In order to write the model you would need to have access to a FORTRAN compiler such as Intel Visual Fortran v11.x

  Once you have the model of the drying substance, you would connect its moisture loss to a moisture gain input of the building (drying chamber) model.

Kind regards,
 David

On 10/30/2011 20:45, Adriana Gómez Aldana wrote:

Good Morning,

I am a TRNSYS user since it is one of the tools for my phD thesis. Currently, I am working in a solar drying problem and I would like to know if there is a special module to simulate the drying chamber. If it is possible to acquire this module, I would be very thankful if you can explain me how is the procedure to access it.

Thanks for your attention,

Adriana Gómez
phD Student - Engineering Department
Universidad de los Andes
Bogotá, Colombia




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