[TRNSYS-users] type for simulating MCP materials

[David BRADLEY via TRNSYS-users]

There are a number of components available as add-ons to TRNSYS.

Type204 is a freely available model provided as-is and without any 
technical support in the TRNLib archive 
(http://sel.me.wisc.edu/trnsys/trnlib/library16.htm#thermalstorage)

Type1270 is a commercially available PCM model from TESS that assumes 
the PCM is sandwiched as a layer in a room's wall constructions. 
(http://trnsys.com/tess-libraries/individual-components.php)

Type399 is a commercially available PCM model from Transsolar 
(http://trnsys.de/docs/komponenten/komponenten_ts_en.htm)

kind regards,

  David



On 05/04/2017 09:05, via TRNSYS-users wrote:
> Dear Jeff Thornton
> I would like to ask you if there is a type in TRNSYS wich simulate an 
> MCP (material phase change) model
> thank you
>
> Kaouther Ben Nasr
> Docteur Ingénieur\\Génie Énergétique
> Maître assistant à l'ENAU
> Chercheur au CRTEn\\Technopôle Borj Cédria
> mobile: +216 53 48 44 38
>
> ------------------------------------------------------------------------
> *De: *"Jeff Thornton via TRNSYS-users" 
> <trnsys-users at lists.onebuilding.org>
> *À: *"Amirreza Heidary" <amirrezaheidarysbu at gmail.com>, "TRNSYS users 
> mailing list at OneBuilding.org" <trnsys-users at lists.onebuilding.org>
> *Envoyé: *Samedi 29 Avril 2017 16:52:42
> *Objet: *Re: [TRNSYS-users] problem with differential controller
>
> Amirreza,
>
> Real solar collectors do the same thing under certain circumstances. 
>  From a first glance I would say your dead bands are too tight - 
> typically we see 10/2 not 5/2.  It's also possible that your collector 
> pump flow rate is  too high.  With collectors connected in series you 
> typically have a pump flow rate the same as if you had only one 
> collector.  Collectors are designed for a given maximum flow rate for 
> pressure drop reasons.  For example, assume we had a collector that 
> wanted 450 kg/h of flow and we had 6 in series.  We would run the pump 
> at 450 (each collector gets the 450 that way).  You wouldn't run your 
> pump at 2700 (450 x 6) or the pressure drop would be ridiculously 
> high.  If you have that high of a flow rate you'll get exactly what 
> you are seeing in your project.  With no flow the collector 
> temperature is above the deadband but when the pump turns on the high 
> flow rate causes the outlet temperature to drop below the lower 
> deadband.  The controller can't find a solution since both are correct 
> and will oscillate between on and off.
>
> Jeff
> TESS Inc
>
> Sent from my iPhone
>
> On Apr 29, 2017, at 2:36 AM, Amirreza Heidary via TRNSYS-users 
> <trnsys-users at lists.onebuilding.org 
> <mailto:trnsys-users at lists.onebuilding.org>> wrote:
>
>     Dear All
>     I'm using a 5 collectors in series with a differential controller
>     to turn on the pump when the difference of collector outlet and
>     inlet temperatures is more than 5 and turn it off when it is less
>     than 2.But the signal and collector output temperatures are
>     fluctuating too much, also the signal is not compatible with
>     temperature variations.as <http://variations.as> you can see in
>     the following diagram, the signal is 1 when the outlet temperature
>     is at maximum !
>     (red line is collector outlet temperature and orange line is the
>     controller signal)
>     Inline image 1
>     Inline image 2
>
>     --------------------------------------------------------------------------------------------------------------------------------------------------
>
>     *amirrezaheidary*
>     /master student of energy systems Engineering/
>     /Sharif university of technology/
>     /Tehran-Iran/
>     /E-mail address/:
>
>         heidari at energy.sharif.edu <mailto:heidari at energy.sharif.edu>
>
>         a <mailto:sm_mousavi at pwut.ac.ir>mirrezaheidarysbu at gmail.com
>         <mailto:mirrezaheidarysbu at gmail.com>
>
>     *P*//*/Save a tree... Please don't print this E-mail unless you
>     really need to./***
>
>
>
>
>
>
>
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>
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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