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Today's Topics:
1. EQUATION (??)
2. Re: air Density in TRNBuild (Mohamed Ayman)
---------- 已转发邮件 ----------
From: 王洋 <wanghongyang1767@gmail.com>
To: trnsys-users@cae.wisc.edu
Date: Wed, 2 Nov 2011 12:16:37 +0100
Subject: [TRNSYS-users] EQUATION
Dear all,Please tell me how to set an equation:OF=1, when CO2%>1000OF = 0, when CO2%< 700Thanks!wang在 2011年11月2日 下午12:14，王洋 <wanghongyang1767@gmail.com>写道：
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@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@tess-inc.com>
To: "Adriana Gómez Aldana" <adrigomezaldana@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 GómezphD Student - Engineering DepartmentUniversidad de los AndesBogotá, Colombia
_______________________________________________ TRNSYS-users mailing list TRNSYS-users@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@tess-inc.com http://www.tess-inc.com http://www.trnsys.com
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---------- 已转发邮件 ----------
From: Mohamed Ayman <ayman.mohamed@aalto.fi>
To: 王洋 <wanghongyang1767@gmail.com>, "trnsys-users@cae.wisc.edu" <trnsys-users@cae.wisc.edu>
Date: Wed, 2 Nov 2011 11:18:54 +0000
Subject: Re: [TRNSYS-users] air Density in TRNBuild
Hi Wang
The air density changes with temperature in Trnbuild.
Best Regards
Ayman Mohamed
From: trnsys-users-bounces@cae.wisc.edu [mailto:trnsys-users-bounces@cae.wisc.edu] On Behalf Of ??
Sent: Wednesday, November 02, 2011 1:14 PM
To: trnsys-users@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@cae.wisc.edu>
Send TRNSYS-users mailing list submissions to
trnsys-users@cae.wisc.edu
To subscribe or unsubscribe via the World Wide Web, visit
https://mailman.cae.wisc.edu/listinfo/trnsys-users
or, via email, send a message with subject or body 'help' to
trnsys-users-request@cae.wisc.edu
You can reach the person managing the list at
trnsys-users-owner@cae.wisc.edu
When replying, please edit your Subject line so it is more specific
than "Re: Contents of TRNSYS-users digest..."
Today's Topics:
1. Re: Information (David BRADLEY)
---------- 已转发邮件 ----------
From: David BRADLEY <d.bradley@tess-inc.com>
To: "Adriana Gómez Aldana" <adrigomezaldana@gmail.com>
Date: Tue, 01 Nov 2011 11:35:52 -0500
Subject: Re: [TRNSYS-users] InformationAdriana,
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
_______________________________________________TRNSYS-users mailing listTRNSYS-users@cae.wisc.eduhttps://mailman.cae.wisc.edu/listinfo/trnsys-users
--***************************David BRADLEYPrincipalThermal Energy Systems Specialists, LLC22 North Carroll Street - suite 370Madison, WI 53703 USAP:+1.608.274.2577F:+1.608.278.1475d.bradley@tess-inc.comhttp://www.tess-inc.comhttp://www.trnsys.com
_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@cae.wisc.edu
https://mailman.cae.wisc.edu/listinfo/trnsys-users
_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@cae.wisc.edu
https://mailman.cae.wisc.edu/listinfo/trnsys-users