[TRNSYS-users] Adiabatic boundary wall in TYPE56

Xavier García Casals xavi at dfc.icai.upco.es
Thu Dec 2 10:11:54 PST 2004

With the 'identical' option, from what I understood from the manual, what you do is to impose the condition that the convective fluid in the back of the surface has the same temperature as the 'star temperature' from the front of the surface. In this way you create an adiabatic plane INSIDE the wall, but not on the back surface (there are non nule heat flows at both sides of the wall). What I was wondering is whether you can impose an adiabatic condition straight on the BACK surface of the wall.
  ----- Original Message ----- 
  From: David Bradley 
  To: Xavier García Casals ; trnsys-users at engr.wisc.edu 
  Sent: Thursday, December 02, 2004 5:26 PM
  Subject: Re: [TRNSYS-users] Adiabatic boundary wall in TYPE56

  Dear Xavier,
    With a BOUNDARY wall, you have the option of defining the temperature on the other side of the wall as "userdefined" (either an input, a constant value, or a schedule) or as "identical." To define an adiabatic wall, simply set the boundary temperature to "identical"
  Kind regards,

  At 10:14 AM 12/2/2004, Xavier García Casals wrote:

    Is there a direct way to specify an adiabatic boundary wall in TYPE56?. From what I could find in the documentation, only boundary walls with a boundary temperature may be deffined. In principle setting a very small wall convection coefficient (HBACK) would fisically lead to an adiabatic condition, but from the manual it seems it leads to the oposite (wall temperature equal to boudary temperature). Two aproximations I can think of are to specify the identical condition, in which case an adiabatic plane would apear WITHIN the wall, or specifying a layer with a very high resistence at the outer side of the wall. But is there not a way to specify the boundary adiabatic condition straight?
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