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Re: [TRNSYS-users] TRNSYS-users Digest, Vol 83, Issue 6


Dear Laia Cases,
 
Many thanks!
 
 
For OF=GT(CO2,1000)*1+GT(700,CO2)*0
GT(700,CO2)*0 is always 0.
 
I think it should be  OF=GT(CO2,1000)*1+GT(CO2,700)*1
 
But the result becomes CO2 ia always less than 700, it can not get to 1000.
 
So PLEASE pass me some ideas or EQUATIONS: first, get to 1000 ppm, then OF=1, until 700 ppm OF = 0
 
 
Many thanks in advance!
 
Br.
 
wang

 

 
2011/11/2 <trnsys-users-request@cae.wisc.edu>
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Today's Topics:

  1. Re: EQUATION (Laia Cases - iMat)


---------- 已转发邮件 ----------
From: Laia Cases - iMat <lcases@imat.cat>
To: trnsys-users@cae.wisc.edu
Date: Wed, 02 Nov 2011 14:07:11 +0100
Subject: Re: [TRNSYS-users] EQUATION
Wang,

OF=GT(CO2,1000)*1+GT(700,CO2)*0

Laia

El 02/11/2011 14:03, 王洋 escribió:
Dear all,
 
          Please tell me how to set an equation:
 
         OF=1, when CO2%>1000
 
         OF = 0, when CO2%< 700
 
         I tried to use LT and GE, but e.g. it only realize OF = 1, when CO2%>1000 and OF = 0, when CO2% < 1000. 
 
         I need 
         OF=1, when CO2%>1000
 
         OF = 0, when CO2%< 700
 
      Thanks in advance!
 
       wang

在 2011年11月2日 下午12:19， <trnsys-users-request@cae.wisc.edu>写 道：
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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%>1000
 
         OF = 0, when CO2%< 700
 
      Thanks!
 
       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 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:+1.608.278.1475
d.bradley@tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@cae.wisc.edu
https://mailman.cae.wisc.edu/listinfo/trnsys-users





---------- 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>

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You can reach the person managing the list at
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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] 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

 



_______________________________________________
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


_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@cae.wisc.edu
https://mailman.cae.wisc.edu/listinfo/trnsys-users

 


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TRNSYS-users@cae.wisc.edu
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_______________________________________________
TRNSYS-users mailing list
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--
Laia Cases
Unitat de Condicionament Tèrmic
iMat - Centre Tecnològic de la Construcció
lcases@imat.cat
www.imat.cat
Wellington 23  ・   E-08018 Barcelona
T +34 93 553 97 95
F +34 93 553 97 96
Imprimiu aquest document només si és necessari

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