[Virtual-sim] Issues and dxf?
Paul Carey
paul at zed-uk.com
Mon Mar 9 10:07:03 PDT 2009
A couple of things to add to this:
Here are some notes for dxf use:
Explode all blocks – this allows text to come into VE properly
Delete all unnecessary layers and purge the drawing
Copy to new drawing as a block and paste/set origin at 0,0 otherwise you’ll
end up with graphics issues when the origin is a long way from 0,0.
You can also draw a single line on a new layer and then just use that layer
to create the model – this should allow construct-dxf to work.
For Microflo use:
Keep it simple.
Try not to play with the grid too much as although in theory this should be
better, invariably it makes things worse.
Try and use a grid and snap to it to set the model up in the first place so
you don’t end up with lots of small slithers of grid.
If it’s a complicated project, it probably needs a complicated CFD tool.
Regards
Paul
Dr Paul Carey
Director
Low Carbon Energy Assessor
Zero Energy Design Ltd
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From: virtual-sim-bounces at lists.onebuilding.org
[mailto:virtual-sim-bounces at lists.onebuilding.org] On Behalf Of SINGH
Manjinder
Sent: 08 March 2009 22:52
To: Erik Eriksson
Cc: virtual-sim at lists.onebuilding.org
Subject: Re: [Virtual-sim] Issues and dxf?
Hi Erik
There are couple of suggestions while using the Microflo module of IES.
1. While importing the dxf file into IES, the dxf file should be clear,
I mean to say to be a single line file as to avoid picking the points close
to one another.
2. Try to use the grid for the point selection not the end point. As
while using the program you can find a difference that while picking up a
end point there could be a small variation in the point which will result in
a very narrow grid and which will increase the no. of cells and that could
led to a problem of the memory and also the convergence will not be achieved
and end up with inappropriate results.
3. IES is simple to use for CFD as it works very well if we have a
Maximum aspect ratio <10:1
4. IES is having a problem, it can’t do the internal and external
simulation at one instance (in a single go), where as the programs like
Phoenics (CHAM software) can do it in one go.
May be these points help you in achieving the right results.
Regards
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:
<http://www.projectservices.qld.gov.au/> www.projectservices.qld.gov.au
_____
From: Erik Eriksson [mailto:erik.eriksson at white.se]
Sent: Tuesday, 3 March 2009 6:53 PM
To: SINGH Manjinder
Cc: Nouman; virtual-sim at lists.onebuilding.org
Subject: RE: [Virtual-sim] Issues and dxf?
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
Inactive hide details for "SINGH Manjinder" ---2009-03-03 00:09:08---Hi
Erik"SINGH Manjinder" ---2009-03-03 00:09:08---Hi Erik
From:
"SINGH Manjinder" <Manjinder.SINGH at projectservices.qld.gov.au>
To:
"Erik Eriksson" <erik.eriksson at white.se>, "Nouman" <nouman310 at yahoo.com>
Cc:
<virtual-sim at lists.onebuilding.org>
Date:
2009-03-03 00:09
Subject:
RE: [Virtual-sim] Issues and dxf?
_____
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: <mailto:Manjinder.Singh at projectservices.qld.gov.au>
Manjinder.Singh at projectservices.qld.gov.au | Web:
<http://www.projectservices.qld.gov.au/> 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/> http://www.white.se
We are certified according to ISO 9000 and 14 001
Inactive hide details for 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
From:
Nouman <nouman310 at yahoo.com>
To:
Erik Eriksson <erik.eriksson at white.se>, virtual-sim at lists.onebuilding.org
Date:
2009-03-02 17:21
Subject:
Re: [Virtual-sim] Issues and dxf?
_____
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/> http://www.white.se
We are certified according to ISO 9000 and 14 001
_____
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