[TRNSYS-users] Type8a: Setback temperature issue

[PAUL COALES]

Thanks Kent,

I do appear to be seeing the same behaviour.  Is there a prefered method for reporting such issues?

I was looking for details of Type 671 but dont seem to be able to find any on the TESS /TRNSYS site.  Do you have a reference?

Paul

--- On Mon, 7/12/09, Kent Beason <kbeason at schlitterbahn.com> wrote:

> From: Kent Beason <kbeason at schlitterbahn.com>
> Subject: RE: [TRNSYS-users] Type8a: Setback temperature issue
> To: "PAUL COALES" <coalespr at btinternet.com>, trnsys-users at cae.wisc.edu
> Date: Monday, 7 December, 2009, 18:56
> Paul, 
> 
> I recently had the same problem with Type8a.  Related
> to your #2 conditions below, set your "Heating set back
> temperature difference" to zero and see if the heating stage
> operates then.  My experience with 8a says it will
> work, but of course with a useless setback function.  I
> ended up throwing out Type 8a in my simulation and easily
> using Type 671 from the TESS library.
> 
> Kent Beason
> Schlitterbahn Development Group
> 830-609-8904 m
>  
> -----Original Message-----
> From: PAUL COALES [mailto:coalespr at btinternet.com]
> 
> Sent: Monday, December 07, 2009 7:29 AM
> To: trnsys-users at cae.wisc.edu
> Subject: [TRNSYS-users] Type8a: Setback temperature issue
> 
> Hi 
> 
> Are there any issues with Type8a, setback function?  The
> instructions for use seem straight forward but it does not
> seem to work for me:
> 
> 1) If INPUT "Set back control function" is fixed at 0,
> setback behaviour is disabled.  "Control signal for 1st
> stage heating" is set when  "Room temperature" drops below
> "1st stage heating temperature".  This behaviour seems
> correct.
> 
> 2)If INPUT "Set back control function" is fixed at 1,
> setback behaviour should be enabled.  However, the "Control
> signal for 1st stage heating " is never set.  My heating
> system never turns on and my room temperature continues to
> fall.
> 
> I've set "minimum primary source temperature" to a low
> value (10 degrees)  "1st stage heating in 2nd stage" is set
> to 1.  "Heating set back temperature difference" is set to
> 1 deltaC
> 
> 
> Have I missed something?
> 
> Paul
> 
> 
> 
> 
> 
>