[TRNSYS-users] PCM model for trnsys15?

[David Bradley]

Dear LF Ding,
   The active layer model in Type56 is a semi 
empirical model (meaning that it is in some part 
based on curve fit data) and assumes that the 
working fluid in the floor is water. I don't 
think that it would be valid to model a PCM layer 
in a floor using the active layer model. The 
active layer model is intended for modeling 
radiantly heated and cooled floors that have an 
embedded network of pipes filled with either cold 
or hot water. The approach most often taken in 
modeling floor and wall technologies is to write 
an external model of the floor or wall and have 
that model interface with Type56. We have written 
a number of radiant floor models that take the 
inside surface temperature of a Type56 BOUNDARY 
wall, then calculate and return the outside 
surface temperature back to Type56 as an input. I 
do not think that any of the radiant floor models 
that we have written can be used to approximate a 
wall with a PCM layer because of the change in 
specific heat of a PCM material as it goes 
through its melting / solidification. It looks as 
though the PCM component that you downloaded is 
intended to interface with Type56, although 
through a zone temperature and an energy flux, 
not through surface temperatures. If you did not 
find that component in the TRNSYS 15 section of 
the TRNLib then that is an indication that the 
model was written for TRNSYS 16 and does not exist in the older format.
Kind regards,
  David

At 00:46 6/24/2007, lfding at mail.ustc.edu.cn wrote:
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>Dear trnsys user£¬
>I am a trnsys user, I get you email from the 
>trnsys user workshop.I am currently
>trying to simulate Radiant Floor System in TYPE 56, and want to add a layer to
>the floor, the layer is made by PCM, now I get a 
>new PCM model which is created
>by
>you from the trnsys website.
>I have a difficulty of how the PCM type 
>connected to the type56, and as a layer
>of the floor, what is the interface of them? What is the meaning of the
>surface-to-surface approach? How I insert the new PCM model into the TYPE56?
>In the trnsys website, I can download the zip of 
>PCM model, but the document of
>the type can¡¯t open, could you please transfer a new one for me?
>Now I work with prebid 5.0.8 and trnsys 15 with iisibat 3, but the zip of PCM
>model is created for trnsys 16, do you have another version of the model of
>trnsys15? Thank you very much!
>Best wishes
>                                                           lfding
>
>
>
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