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Today's Topics:
1. Re: thermosyphon sdwh (keilholz, werner)
2. email (Adwit Kashyap)
3. query regarding runtime error (Adwit Kashyap)
4. Re: Error: generating shading/insolation matrix (Marion Hiller)
5. Type553 collector performance question (Nicholas LaHam)
6. Validated (unglazed, or any other...) collector type (Philip Horn)
---------- Forwarded message ----------
From: "keilholz, werner" <werner.keilholz@cstb.fr>
To: "Enmisagh@aol.com" <Enmisagh@aol.com>, "trnsys-users@cae.wisc.edu" <trnsys-users@cae.wisc.edu>
Date: Tue, 17 May 2011 08:59:37 +0000
Subject: Re: [TRNSYS-users] thermosyphon sdwh
Grüss Gott to the people in Munich ! Do you know there’s TRNSYS facebook group, as well as a LinkedIn group?
You could meet there an set up a local event.
De : trnsys-users-bounces@cae.wisc.edu [mailto:trnsys-users-bounces@cae.wisc.edu] De la part de Enmisagh@aol.com
Envoyé : dimanche 15 mai 2011 15:56
À : trnsys-users@cae.wisc.edu
Objet : [TRNSYS-users] thermosyphon sdwh
hi all
i want to model a thermosiphon sdwh . in this model the outlet temperature is 55 c . if I want to use auxiliary heater , how can I set outlet temperature?
---------- Forwarded message ----------
From: Adwit Kashyap <kashyap.adwit235@gmail.com>
To: trnsys-users@cae.wisc.edu
Date: Tue, 17 May 2011 14:56:22 +0530
Subject: [TRNSYS-users] email
kashyap.adwit235@gmail.com
---------- Forwarded message ----------
From: Adwit Kashyap <kashyap.adwit235@gmail.com>
To: trnsys-users@engr.wisc.edu
Date: Tue, 17 May 2011 15:24:02 +0530
Subject: [TRNSYS-users] query regarding runtime error
hi. i am a fairly new user. i made a simple solar pv project using types 109-user for weather data, 94-a pv array, 65-d online plotter without file, an equation and a system printer. the time period was from 0 to 8670 hours.on running the simulation, it shows zero simulation time and the output file shows only one row of values, all zeroes.also, when i save it in C:>Program Files (x86)>Trnsys>MyProjects, it is not visible in the folder, but is visible when u use the File>Open option in Trnsys Studio and go to the location.i tried saving the project in a different drive and then it got saved.
---------- Forwarded message ----------
From: "Marion Hiller" <hiller@transsolar.com>
To: "joke.d" <joke.d@vkgroup.be>
Date: Tue, 17 May 2011 13:26:54 +0200
Subject: Re: [TRNSYS-users] Error: generating shading/insolation matrix
Joke,
the error message is due to too surface numbers > 999. The surface
number can't be written in the log file (artsmetiers7_shd.log) and ***
are written instead.
*** Notice at time : 0.000000
Orientation of wall SURF=***: azimuth angle= 180.00°, slope= 90.00°
Orientation of wall SURF=***: azimuth angle= 0.00°, slope= 0.00°
In order to see why the surface numbers are so high (starting with
3993 instead of 1) I need to need the original *.idf and check the
import function.
With what version of TRNSYS17 are you working? I have in mind that we
fixed such a bug created by the import.
Kind regards,
Marion
-----Ursprüngliche Nachricht-----
Von: Joke De Beuckelaer [mailto:joke.d@vkgroup.be]
Gesendet: Donnerstag, 12. Mai 2011 08:58
An: duffy@tess-inc.com; trnsys-users@cae.wisc.edu
Betreff: Re: [TRNSYS-users] Error: generating shading/insolation matrix
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---------- Forwarded message ----------
From: Nicholas LaHam <ndlaham@gmail.com>
To: trnsys-users@cae.wisc.edu
Date: Tue, 17 May 2011 12:01:56 -0400
Subject: [TRNSYS-users] Type553 collector performance question
Hey all,I have a question about the Type553 Unglazed collector and how it's performance interacts when changing flowrates in two different scenarios. I was wondering if someone could help explain the trend in a practical way for me so I can explain it to my colleague.First off, when just running a constant flowrate and constant incoming temperature as the inputs to the collector, I can see that increasing that flowrate increases the useful energy out of the collector. This makes sense and is intuitive.
Now when I use a loop instead for the same collector, (say with a pump operating at 1 GPM just as a starting point), and a perfect heat exchanger with the same incoming water temp now on the load side of the HX, I see a different trend I'm having trouble explaining to my colleague.What is happening is that the useful energy increases like the first scenario, but only up to the flowrate that is on the load side of the HX. ex. So if I have 5 GPM on my load side, I see an increase in performance up to 5 gpm on my collector side, and then the performance begins to drop after increasing it any further.Another way to say it is that whenever my flowrate of the collector array is greater then my load I have weakened performance. It seems that a 1:1 flow ratio on each side of the HX is the optimal method (assuming same specific heats).Can anyway explain in a conceptual manner why there is this decrease only when using the HX? I was thinking that because the load side of the HX is the limiting flow (the one that isn't changing) then because the collector flow is higher, that not all the heat from the collector can be transfered, leaving the outlet of the HX on the collector side hotter than if the flows were balanced. Thus in turn lowering the efficiency and available energy to be collected the next time it passes through the collector.I can actually see the source side temp coming out of the HX hotter than the incoming water when the collector flow is higher, but my colleague still thinks the energy should not drop. He believes that when increasing the flow up to a very large number over many trials, the useful energy will always rise up until it levels off asymptotically, whereas in my case, it is doing more of a bell curve and dropping off after it becomes higher than the load flowrate.Thanks for any help.Nick LaHam
---------- Forwarded message ----------
From: Philip Horn <phorn@fraunhofer.org>
To: "trnsys-users@cae.wisc.edu" <trnsys-users@cae.wisc.edu>
Date: Tue, 17 May 2011 12:23:20 -0400
Subject: [TRNSYS-users] Validated (unglazed, or any other...) collector type
Dear All,
I am searching for a experimentally validated unglazed collector setting in TRNSYS (with values of Inputs, Parameters, assumptions, etc.).
I am currently working on an unglazed polymer PVT collector with rectangular flow channels (so NOT a fin-type collector.
I would like to compare my attempts with similar systems. As there are probably no “really similar” systems available, any validated solar collector model will be helpful.
Ideally with long term measurements validation.
Can someone comment on the accuracy of the default values for the collector types, e.g. is it a good enough reference to simply use a TRNSYS type out of the box?
Would some standard decks from IEA tasks work (I think they exist, right?) for my purpose?
I am currently reading about Type 132, but till now I could not find any download link (and it should be openly available if I understood correctly).
Can anyone help on that?
I am not sure about the validity of my potential results, as I do not have a prototype yet, so I try to judge how I could somewhat validate by comparison.
Your help is highly appreciated!!
Best from freezing Boston,
Philip
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