[Virtual-sim] Issues and dxf?
SINGH Manjinder
Manjinder.SINGH at projectservices.qld.gov.au
Sun Mar 8 15:51:31 PDT 2009
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: www.projectservices.qld.gov.au <http://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
"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: Manjinder.Singh at projectservices.qld.gov.au <mailto:Manjinder.Singh at projectservices.qld.gov.au> | Web: www.projectservices.qld.gov.au <http://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
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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