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Prof Sommer,<br>
For the case of no fins (ie no contact resistance) and no
pipe-in-pipe configuration, parameters 41 and 42 have the same
value; that of the thermal conductivity of the heat exchanger
material (copper probably). Type60 does not decrease the volume of
the nodes by the fluid volume occupied by the heat exchanger. It
assumes that the heat exchanger volume is small in comparison to the
tank volume. The storage tank in the TESS Storage library does
remove the volume of the heat exchanger from the volume of each tank
node and may be more appropriate for tanks that contain large heat
exchangers.<br>
Kind regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 11/24/2012 04:41, Prof K Sommer
wrote:<br>
</div>
<blockquote cite="mid:50B0A474.9070101@fh-koeln.de" type="cite">Hi,
<br>
<br>
I try to simulate the buffer tank, details of that are attached,
with type 60 in TRNSYS 16.
<br>
My questions to the parameters 41 and 42:
<br>
What exactly covers "Heat exchanger wall conductivity" and what
would be the right input value for this parameter if there is only
a single pipe hx without fins and without pipe-in-pipe solution?
<br>
And how does the model handle the 60 liter water volume inside the
pipe hx from time step to time step if the DHW usage is every hour
at the
<br>
beginning around 30 to 50 liter per min.?
<br>
<br>
Many thanks in advance.
<br>
<br>
<br>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
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