[TRNSYS-users] Active layer dividing

Tue Feb 1 23:57:27 PST 2011

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 at tess-inc.com] 
Gesendet: Dienstag, 1. Februar 2011 23:52
An: 王洋
Cc: trnsys-users at 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 at 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 at 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 at tess-inc.com>
To: "Aaron J. Danenberg" <danenberg at 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 at 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 at tess-inc.com

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

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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 at tess-inc.com

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

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