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Re: [TRNSYS-users] Active layer dividing



David,

 

the reason why type 56 may calculates a slightly smaller required min. mass flow rate than TRNBuild is

due to different heat transfer coefficients (laminar/ turbulent).

 

If you get this error message I suggest to check your actual flow that is used in your TRNSYS simulation

and NOT the min. desired inlet mass flowrate in TRNbuild!

 

Kind regards,

 

Marion

 


  

Von: David BRADLEY [mailto:d.bradley@tess-inc.com]
Gesendet: Dienstag, 1. Februar 2011 23:52
An: 王洋
Cc: trnsys-users@cae.wisc.edu
Betreff: Re: [TRNSYS-users] Active layer dividing

 

Wang,
 I have seen this happen before as well; where the inlet mass flow rate is above the required minimum but yet you still get an error saying that the flow is too low. I worked with Transsolar on tracking down the cause of the problem and we were never able to. I try to keep the inlet mass flow rate at least 10 to 20% higher than the minimum flow rate. Adrien's response is a good one; use the autosegment feature to break your floor up into two or more floor segments in series and your minimum specific flow rate will drop far enough below the 5.4 kg/h.m2 that you are sending it.
Kind regards,
 David


On 2/1/2011 06:48, 王洋 wrote:

Dear all,

I defined a active layer, but it shows ERROR as follows:




 Fatal Error at time   :         0.350000
    Generated by Unit     :     4
    Generated by Type     :    56
    Message               : Specific fluid mass flow of active layer in surface   7 below minimum value of 5.35 kg/m2h Please, increase the minimum mass flow rate or use the autosegmentation feature of TRNBuild for subdividing the surface.



But the min. allowed inlet mass flowrate is 5.37 kg/m2h, I defined the min. desired inlet mass flowrate is 5.4 kg/m2h.
The ATTACHED is the detailed setting of ACTIVE LAYER SPECIFICATION. Please have a look and tell me how to correctly define them?

Please tell me how to increase the minimum mass flow rate? Where is it in detail? I want to get only one surface not dividing it. Please tell me how to get only one segmentation in detail?


Many thanks!


Br.

wang

在 2011年2月1日 上午11:21,王洋 <wanghongyang1767@gmail.com>写 道:

Dear all,

I defined a active layer, but it shows ERROR as follows:




 Fatal Error at time   :         0.350000
    Generated by Unit     :     4
    Generated by Type     :    56
    Message               : Specific fluid mass flow of active layer in surface   7 below minimum value of 5.35 kg/m2h Please, increase the minimum mass flow rate or use the autosegmentation feature of TRNBuild for subdividing the surface.



But the min. allowed inlet mass flowrate is 5.37 kg/m2h, I defined the min. desired inlet mass flowrate is 5.4 kg/m2h.
The ATTACHED is the detailed setting of ACTIVE LAYER SPECIFICATION. Please have a look and tell me how to correctly define them?

Please tell me how to increase the minimum mass flow rate? Where is it in detail? I want to get only one surface not dividing it. Please tell me how to get only one segmentation in detail?


Many thanks!


Br.

wang

2011/1/31 <trnsys-users-request@cae.wisc.edu>

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Today's Topics:

  1. Re: Using Equations with Initial Values (David BRADLEY)


---------- 已转发邮件 ----------
From: David BRADLEY <d.bradley@tess-inc.com>
To: "Aaron J. Danenberg" <danenberg@hartford.edu>
Date: Mon, 31 Jan 2011 11:54:09 -0600
Subject: Re: [TRNSYS-users] Using Equations with Initial Values

Aaron,
  Type93 will do exactly that.
Best,
 David


On 1/31/2011 11:42, Aaron J. Danenberg wrote:

In the simulation studio I am using the equation feature.  For the first time step, I need a variable in the equation to be some defined constant value, for the following time step I need that variable to be the output of another component of the previous time step.  Does anyone know how to do this?

 

Aaron J. Danenberg

University of Hartford

Mechanical Engineering Graduate Student

danenberg@hartford.edu

 

 
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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


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_______________________________________________
TRNSYS-users mailing list
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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