[TRNSYS-users] air Density in TRNBuild

[王洋]

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>

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>   1. Re: Information (David BRADLEY)
>
>
> ---------- 已转发邮件 ----------
> From: David BRADLEY <d.bradley at tess-inc.com>
> To: "Adriana Gómez Aldana" <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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>
> --
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 22 North Carroll Street - suite 370
> Madison, WI  53703 USA
>
> P:+1.608.274.2577
> F:+1.608.278.1475d.bradley at tess-inc.com
> http://www.tess-inc.comhttp://www.trnsys.com
>
>
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