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?
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?
When replying, please edit your Subject line so it is more specific
than "Re: Contents of TRNSYS-users digest..."
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?