[TRNSYS-users] Stratification in Tank Type534

[Alaia Sola]

Hi everyone,

I am using
Type534 with Plug-in, inserting 1 port and 1 miscellaneous heat flow to it. My
doubt is about temperature stratification in the tank. Even if I increase the
number of nodes, the temperature difference between the node where I insert the
heat flow and the rest of the nodes is too large, i.e. the nodes without external heating barely warm up. It also happens even if I remove the port
and, consequently, simulate it as a tank without any inlet or outlet: the lower
nodes barely increase their temperature (I want the miscellaneous heat flow in
node 1 or 2), no matter the time length I run the simulation... The upper nodes
do reach the desired temperature (I have a controller to the heater that is connected
to miscellaneous heat flow for that) but the lower nodes remain almost at
constant temperature. I tried to change the “inversion mixing flow rate” to
both high and low values, negative and positive values, zero… but the changes
in T of the nodes are not visible. I want to increase T of water in tank from
20ºC to 150ºC and I have a quite high water draw from the tank, thus I don’t want
that only one or two nodes reach 150ºC, but I want most or all of the tank to do so instead… no
matter how much time it takes to heat it up. How to make the lower nodes to heat up? Which other
parameter can I change so the stratification in the tank really works? Is there
any other parameter to change rather than “inversion mixing flow rate” to get
normal stratification? Should I use another type?

Thank you very
much in advance.

 

Alaia Sola Saura

Project engineer

Thermal Energy
and Building Performance Group

 

IREC

Institut de Recerca en Energia de
Catalunya

www.irec.cat

  

 		 	   		  
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