[TRNSYS-users] doubt on solar thermal collectors

[Jens Apel]

Francesco,

These collector types do not take into account the thermal capacity of
the material. 
There is a collector that calculates with thermal capacity in the TESS
libraries. Transsolar sells the type 301, which also has a parameter for
the heat capacity. 

Hope that helps,

Jens



 
 
-----Original Message-----
From: DONAZZAN FRANCESCO MARIA [mailto:fm.donazzan at studenti.unitn.it] 
Sent: Montag, 22. Dezember 2008 11:44
To: trnsys-users at cae.wisc.edu
Subject: [TRNSYS-users] doubt on solar thermal collectors


Dear all,
I have a doubt on the functioning of the solar thermal collectors (types
1,
71 and 73). I run the SDHW example of TRNSYS 16.01.0003.
At the beginning of the day the radiation start to increase. The pump is
not working yet and the temperature inside the collector (the output
temperature) increase too. When the temperature is high enough the
controller
turns ON the pump and immediately (in a time step!) the temperature
decrease
to a value that it had reached as if the pump would have been ALWAYS ON.
Then the controller switch OFF the pump and the temperature increase
again to
a value that it had reached as if the pump would have been ALWAYS OFF.
The
temperature increasing rate in this step can be higher than 20 degrees
per
second!! I think this is not correct, it has no physical meaning.
Is there a way to solve these problems? Or a way to ignore it or
rielaborate 
the final results?
Thanks
Francesco
 
 



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