[Virtual-sim] Issues and dxf?

Eric.Dixon at burthill.com Eric.Dixon at burthill.com
Tue Mar 3 04:25:33 PST 2009


I am currently trying to use MicroFlo to run an external CFD on a building.
The CFD grid statistics window shows I have twice the memory (both physical
and virtual) needed to run the simulation.  However, when I go to run the
analysis I get a pop up dialog saying out of memory and the program freezes
while generating the grid.  I am using MicroFlo for the first time and
welcome any help.

Regards,

Eric Dixon, EIT, LEED AP
Mechanical Engineer

BURT HILL
Level 2, Block 3
The Green Community – Phase 1
P.O. Box 52764
Dubai, United Arab Emirates
tel:  +971 4 810 5700
fax: +971 4 810 5800
cell: +971 50 293 0159
http://www.burthill.com



                                                                           
             Erik Eriksson                                                 
             <erik.eriksson at wh                                             
             ite.se>                                                    To 
             Sent by:                  "SINGH Manjinder"                   
             virtual-sim-bounc         <Manjinder.SINGH at projectservices.ql 
             es at lists.onebuild         d.gov.au>                           
             ing.org                                                    cc 
                                       virtual-sim at lists.onebuilding.org   
                                                                   Subject 
             03/03/2009 12:53          Re: [Virtual-sim] Issues and dxf?   
             PM                                                            
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




Hi Manjinder,

I tested it for a couple of years ago and my experience was that it was
very easy to use. That is normally a good thing, but when it comes to CFD
programs they tend to be very complicated and I just figured that MicroFlo
therefore couldnt be that accurate in its results.

We are looking into it again and I think its brilliant that its so simple,
but the results need to be accurate (obviously).
Have you found the accuracy in the results doubtful?

Best regards

E r i k E r i k s s o n

Energy specialist and project manager
________________________________
White project & environmental management

Box 4700
116 92 STOCKHOLM
Phone: +46(0)8-402 26 77
Fax: +46 (0)8-402 25 10
Visit: Östgötagatan 100
http://www.white.se

We are certified according to ISO 9000 and 14 001

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---2009-03-03 00:09:08---Hi Erik
                                                                           
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Hi Erik

Presently I am working on the Microflo module of IES VE for a CFD analysis.
What kind of help u need??


Manjinder Singh

Mechanical Engineer | Professional Services Portfolio | Project Services
-----------------------------------------------------------------------------------------

Level 5B 80 George Street,
Brisbane, Queensland 4000
T: (07) 3227 8064 | F: (07) 3224 6151
E: Manjinder.Singh at projectservices.qld.gov.au | Web:
www.projectservices.qld.gov.au


From: virtual-sim-bounces at lists.onebuilding.org [
mailto:virtual-sim-bounces at lists.onebuilding.org] On Behalf Of Erik
Eriksson
Sent: Tuesday, 3 March 2009 2:38 AM
To: Nouman
Cc: virtual-sim at lists.onebuilding.org
Subject: Re: [Virtual-sim] Issues and dxf?


Hi,

ok, I've had some experience with dxf-imports. I did it a couple of years
ago and was quite annoyed with it. Has it been improved?
What I found was that when it found a text it looked around it and if it
found walls then that was it, but since you can have different thinkness on
the walls and you need to find the outer limit of the outer walls, but VE
stops at the inner limit and the middle of the interior walls needs to be
found it makes it quite complicated to turn a normal dwg-drawing into a
useful one or have you worked out a smart method of doing this?

When i was referering to reliability I was thinking of heat storage (with
and without false celings) and solar insolation on more complex surfaces
etc.

Have you had any experience with MicroFlo?

Best regards

E r i k E r i k s s o n

Energy specialist and project manager
________________________________
White project & environmental management

Box 4700
116 92 STOCKHOLM
Phone: +46(0)8-402 26 77
Fax: +46 (0)8-402 25 10
Visit: Östgötagatan 100
http://www.white.se

We are certified according to ISO 9000 and 14 001

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Nouman ---2009-03-02 17:21:18---Hi, yes dxf files can be imported in VE and
can save tons of time in Nouman ---2009-03-02 17:21:18---Hi, yes dxf files
can be imported in VE and can save tons of time in drawing the building.
Please ta


                                                                           
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Hi,
yes dxf files can be imported in VE and can save tons of time in drawing
the building. Please take the following steps before you import any dxf
into VE:
                        Remove in dxf file everything except:
                        walls,windows, doors and labels
                        When you are importing the dxf. make sure, that the
                        appropriate scale has been input.
                        The trick to find out scale of the drawing is, to
                        measure a door, typically a single door is 1m, now
                        let say the measurement comes upto be 10m it means
                        its 1:10 scale. etc
The calculation of VE is reliable. Only that the dynamic calculation gives
us actualy true loads which some times differ from ASHRAE loads. The reason
is ASHRAE does all its loads on a particualr design day. Whereas VE picks
up the worse case scanario for the building. VE also has the capability to
somply calculate ASHRAE loads.

Best Regards;
Ali Nouman Khan


From: Erik Eriksson <erik.eriksson at white.se>
To: virtual-sim at lists.onebuilding.org
Sent: Monday, March 2, 2009 8:40:08 AM
Subject: [Virtual-sim] Issues and dxf?

Hi everyone!

I just joined this mail list and I'm curious about how you use this program
and if you have found any issues.
I use it extensivly and I have a few issues with it and I'm afraid that
some of the calculation methods arent that reliable.

I've heard that many users import their geometry by using dxf-files. I've
tried this, but I've found it somewhat complicated.
Do you have any smart methods? What program do you use to create the
dxf-files? Autocad?

Best regards

E r i k E r i k s s o n

Energy specialist and project manager
________________________________
White project & environmental management

Box 4700
116 92 STOCKHOLM
Phone: +46(0)8-402 26 77
Fax: +46 (0)8-402 25 10
Visit: Östgötagatan 100
http://www.white.se

We are certified according to ISO 9000 and 14 001


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