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Re: [TRNSYS-users] Type 60 in TRNSYS 16: parameter values for parameter 41 and 42 ???

Prof Sommer,
  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.
Kind regards,
 David
 

On 11/24/2012 04:41, Prof K Sommer wrote:
Hi,

I try to simulate the buffer tank, details of that are attached, with type 60 in TRNSYS 16.
My questions to the parameters 41 and 42:
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?
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
beginning around 30 to 50 liter per min.?

Many thanks in advance. 



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