[TRNSYS-users] compiling with g95
jeannieboef
jeannieboef at googlemail.com
Tue Mar 13 01:26:33 PDT 2012
Thankyou for the brilliant guide and download package.
Issues:
I have found that JFIX which turns REAL(4) REAL(8) INTEGER(4) INTEGER
(8) as well as COMPLEX numbers into INTEGER(4) is an intel library
function not incorporated in g95.
I am using INT() as an alternative.
DMOD also seems to be an issue (not an intrinsic function), but I'm no
programmer and new to fortran so I still need to google this. But
despite this it has now compiled my dll. The dll works, but an error
occures when trying to do parts associated with DMOD. Anyone have info
regards DMOD?
I had to make sure that five spaces exist before a line continuation
character. Tab spaces throw this out and have to be deleted and
replaced with spaces.
The concatination of an object name as with the FORMAT statements, e.g.
A<maxdescriplength> is not supported. I have hard coded these with
e.g. A25
PS i'm recompiling the printer type25. My aim is to adjust it so that
I can switch off the printing of variables in the input similar to the
print tick box on most componant outputs.
As I debug my source code I will keep you updated.
regards.
Jean marais
Sent from my iPhone
On 13.03.2012, at 03:53, "Matt Duffy" <duffy at tess-inc.com> wrote:
>
> Nick,
>
> Thank you for the information about your experience with the heat
> exchangers.
>
> I would just like to mention that for TRNSYS version 17.1, we
> implemented a mode in Type91 that allows the user to input the
> effectiveness and have that input vary during the simulation.
> Perhaps it is not directly applicable to your situation, but if it
> would be useful, please let me know.
>
> Best,
>
> Matt
>
> ----- Original Message -----
> From: "Nick LaHam" <ndlaham at gmail.com>
> Sent: Mon, March 12, 2012 8:15
> Subject: Re: [TRNSYS-users] TRNSYS-users Digest, Vol 87, Issue 13
>
> Laur! ent,
>
> There is no flat plate HX module in TRNSYS yet, just HX simple
> models that either allow you to input "constant
> effectiveness" (Type91) or "overall heat transfer
> coefficient" (Type5).
>
> This makes things kind of difficult because those two inputs are
> determined by the fluid properties, flowrate, temperature, number of
> plates, material, area of plates, etc. SInce the flowrates and
> temperatures can be changing, so can the overall HTC. Also, you need
> to find a way to determine the overall HTC based on the geometry of
> the HX. This requires a lot of iterative calculations and is not
> that easy to accomplish.
>
> Currently as a workaround, I am using GEA's software which is pretty
> good to size a flat plate heat exchanger for me, and then I give it
> the parameters that I would use it TRNSYS. It let's me select
> different size heat exchangers and then even! tually, the software
> will spit out it's "Overall HTC" (in W/ m^2-K) and a "nominal
> surface area" (in m^2). I simply multiply the values and use this as
> my input for "Overall heat transfer coefficient" in Type5b (I have
> found the counter flow version is the closest match for flat plates
> when using an overall HTC). You can login to the software as a web
> app here or download it too once you register a username. http://flatplateselect.com/site/pub/login.aspx?ReturnUrl=%2fsite%2fDefault.aspx
>
> This isn't a perfect method obviously, because the overall HTC will
> change with varying temperatures and flowrates, but as long as you
> are in the ball park, it will be pretty close. If your flows and
> incoming temperatures don't change, then you will be even more
> accurate. If you only have one variable that changes frequently, you
> could develop a fit curve equation tha! t determines the overall HTC
> and use that equation as an input for the "overall heat transfer
> coefficient". But this would require going through the GEA software
> and spitting out multiple outputs by changing your single input at
> several different points. Then you would have to put the data in
> excel or something similar to find an equation.
>
> This is the best method I have come up with so far, but I am
> currently developing a set of equations using EES from Nellis &
> Klein's "Heat Transfer" book, that will mimic a flat plate by
> actually supplying dimensions, # of plates, thermal conductivty of
> plates, etc. It will also allow me to supply inputs that vary and
> should always give me an accurate heat transfer coefficient. I plan
> to tie the inputs to TRNSYS inputs (possibly using the Type66, or
> just perhaps writing new Fortran code) and execute the EES code in
> TRNSYS eventually. I'm working on it, but I"ll let yo! u know how it
> turns out. The EES side is basically done, but I need to verify the
> equations.
>
> Hope this helps.
>
> Nick LaHam
>
>
>
> 2012/3/9 <trnsys-users-request at cae.wisc.edu>
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> Today's Topics:
>
> 1. type 56 (gabriela vlad)
> 2. Natural ventilation (Chou Shen)
> 3. Water to Water Plate Heat Exchanger (REYNIER Laurent)
> 4. on cooled ceiling (Enyuan Hu)
>
>
> ---------- Forwarded message ----------
> From: gabriela vlad <gabi_ev at yahoo.com>
> To: "trnsys-users at cae.wisc.edu" <trnsys-users at ca! e.wisc.edu>
> Cc:
> Date: Fri, 9 Mar 2012 03: 34:57 -0800 (PST)
> Subject: [TRNSYS-users] type 56
> Dear users,
>
> I want to model a building with type 56. I divided the building
> into several thermal zones but two of them which are adjacent zones
> aren't separated by a wall (there is only air between them). Please,
> give me your opinion, How can the two zones be separated?
>
>
> ---------- Forwarded message ----------
> From: Chou Shen <csz59 at mst.edu>
> To: trnsys-users at cae.wisc.edu
> Cc:
> Date: Fri, 9 Mar 2012 08:24:34 -0600
> Subject: [TRNSYS-users] Natural ventilation
> Hello,
>
> I am trying to use TRNSYS to simulate the situation when a building
> takes natural ventilation rather than air conditionin! g system in
> swing seasons. In that way, the air conditioning turns off when
> outdoor temperature is in the range of [tlow, thigh]. I want to see
> how much energy saving is achieved by implementing natural
> ventilation. Can I achieve my goal? How can I implement natural
> ventilation in TRNSYS? Thanks!
>
> --
> Chou Shen
> Graduate Research Assistant
> Department of Civil, Architectural & Environmental Engineering
> Missouri University of Science and Technology
>
>
>
>
>
> ---------- Forwarded message ----------
> From: REYNIER Laurent <Laurent.REYNIER at cstb.fr>
> To: "trnsys-users at cae.wisc.edu" <trnsys-users at cae.wisc.edu>
> Cc:
> Date: Fri, 9 Mar 2012 15:52:28 +0000
> Subject: [! TRNSYS-users] Water to Water Plate Heat Exchanger
> Dear TRNSYS users,
>
> I'm searching for a reliable model of a water-to-water plate heat
> exchanger.
>
> Can you give me your opinion on the one you are using and which
> TRNSYS type you use for simulation.
>
>
>
> Thank you in advance for your help.
>
> Sincerely yours.
>
> Laurent.
>
>
>
>
>
> Laurent REYNIER
>
> Département ESE/ Division Energie/ Ingénieur Etudes et Recherche
>
> Centre Scientifique et Technique du Bâtiment
> 84 avenue Jean Jaurès - Champs-sur-Marne - 77447 Marne-la-Vallée Ced
> ex 2
>
> Té! l : 01 61 44 80 55
>
> Fax : 01 64 68 83 50
>
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>
> ---------- Forwarded message ----------
> From: Enyuan Hu <bearcharge at gmail.com>
> To: trnsys-users <trnsys-users at cae.wisc.edu>
> Cc:
> Date: Fri, 9 Mar 2012 11:36:37 -0500
> Subject: [TRNSYS-users] on cooled ceiling
> Dear TRNSYSers,
>
> I was wondering if anyone can help me on the cooled ceiling mode.
> Specifically, I have several questions:
>
> 1. how should the cooled ceiling layer be defined? can we define it
> as part of the roof layer (category EXTERNAL and orientation
> Horizontal) or should we define it separately? separate definition
> is my feeling after reviewing some literature.
>
> 2. how should we set up the layer parameters? in the manual, it
> indicates that parameters like norm area can be obtained from the
> producer, does that mean that's the only way to reas! onably set up
> parameters and otherwise there will be problem?
>
> 3. if would be best if some user can generously provide an example
> on this. This may be asking too much, but I really think it would
> help indeed.
>
> Thanks.
>
> Enyuan
>
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