[TRNSYS-users] Factor for air flow of TEST DATA in TRNFLOW and QHEAT and Qheat loss

Dear all,

I have some questions about Factor for air flow of TEST DATA in TRNFLOW and QHEAT and Qheat loss:

1) I want to find the detailed information about "Factor for air flow" in Manual, because I checked the TRNFLOW Manual, but there is no explanations about Air Flow Factor not only in Page 20: Test Data, but also in Page 36: chap.3.2.6 Test Data, besides that, the Example Rest_com.tpf also has no Test Data as air link. So Please tell me where is the exact explanation in manual.

2) QHEAT and Qheat loss question: I verified the MASSLESS condition of BOX(1*1*1 m^3) by TRNSYS i.e. when walls are Massless, I used one-dimensional and steady-state conduction heat transfer equation to verify Qheat loss through all the walls and roof and floor by hand which is the same as QHEAT by TRNSYS, and QHEAT curve keeps constant all the time, but under the same condition( there is no internal gains and no infiltration and ventilation in the test room, I defined all the wall and floor boundary temperature of the test room are 10°C, initial indoor air temperatures of the test room are 20°C, other wall's initial boundary temperature is 10°C etc. simplified condtions in order to verify) when walls have Mass Effect, the result of Qheat loss I used one-dimensional and steady-state conduction heat transfer equations by hand is 24000 kJ/day, but QHEAT value by TRNSYS is 6600 kJ/day. And QHEAT curve doesn't keep constant all the time, until up to about 240th hour, QHEAT begins to keep the constant(please see the ATTACHED). PLEASE explain some possible reasons(why QHEAT curve cann't keep constant of 2nd condition but indoor and outdoor (even the inside and outside wall surface also ) indeed keep constant 20°C and 10°C all the time? why the two results differ so much? etc. ).

MAny thanks!

br.

wang

2011/3/20 <trnsys-users-request@cae.wisc.edu>

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Today's Topics:

1. Re: quite same error than "Google SketchUp tutorial" onthe
12th March (Matt Duffy)
2. Type 11b Tempering Valve (Felix Martin Beutefuehr, BLV-TGE)

---------- 已转发邮件 ----------
From: "Matt Duffy" <duffy@tess-inc.com>
To: "Pauline GELIN" <p.gelin@katene.fr>, trnsys-users@cae.wisc.edu, chester_83@hotmail.it
Date: Sat, 19 Mar 2011 20:20:02 -0500 (CDT)
Subject: Re: [TRNSYS-users] quite same error than "Google SketchUp tutorial" onthe 12th March

Dear Pauline,

There could be a few different things wrong with your IDF. If you would like to send it over, I can take a look when I have a moment.

Best regards,

Matt Duffy
----- Original Message -----
From: "Pauline GELIN" <p.gelin@katene.fr>
Sent: Fri, March 18, 2011 5:51
Subject: [TRNSYS-users] quite same error than "Google SketchUp tutorial" onthe 12th March
Hi,

For my company, I am trying to find the best way to export graphic plan directly in TRNSYS17.
Since yesterday I have tried to create a easy thermal building(with 2 zones including windows and a door) in sketchup8 thanks to the trnsys3d plug in.

Everything was ok (I saved correctly the idf file, I opened it in trnsys17..)until I wanted to open the sketchup8 file again to continue my building and I had the following error alert:

“
ERROR:
NoMethodError
undefined method `active_interface' for nil:NilClass

BACKTRACE:
C:/PROGRA~1/Google/GO24A4~1/Plugins/Trnsys3d/lib/ModelManager.rb:426:in `selection_changed'

C:/PROGRA~1/Google/GO24A4~1/Plugins/Trnsys3d/lib/observers/SelectionObserver.rb:21:in `onSelectionBulkChange'
C:/PROGRA~1/Google/GO24A4~1/Plugins/Trnsys3d/lib/ModelManager.rb:426

“
From that, I tried to “modify the component” but in fact when I drew a rectangle on the wall, the software didn’t recognize it like a window, and it was all the same problem for all other modifications.

Thank you so much in adva! nce for your answers and help.

Pauline Gelin.
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---------- 已转发邮件 ----------
From: "Felix Martin Beutefuehr, BLV-TGE" <beutefuf@fh-trier.de>
To: trnsys-users@engr.wisc.edu
Date: Sun, 20 Mar 2011 16:25:38 +0100
Subject: [TRNSYS-users] Type 11b Tempering Valve
Dear TRNSYS User,

I am Using an Equation to calculate the Inlet-temperature of Type 11b
Tempering Valve. Now I experienced that the outlet Temperature (Outlet 1 and
2) do not equal the inlet temperature, what is strange to me. So what could be
the reason for that behaviour?

I did change the number of oscillations allowed, what did indeed deliver
better results, but in some cases my simulation gets stucks ih the number of
oscillations was changed to a higher value.....

I hope someone can give a hint that will help solving my problem. MAny thanks
in Advance

Best regards

Felix

--
http://webmail.fh-trier.de

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