[TRNSYS-users] Type8a: Setback temperature issue

[Kent Beason]

Paul,

A brief summary of Type671 is found here:

http://www.transsolar.com/__software/download/en/tesslibary_shortinfo_en.pdf

A further note on my use of Type671: I used it in conjunction with both the TESS Type14 Nightsetback and an equation that I defined in order to change the Type671's setpoint (Input #2) with respect to daily time (and seasons).  

TESS Type514 also can be used in lieu of the equation I've described above for a changing daily setpoint.

The documentation of the user-purchased TESS libraries is installed in the TRNSYS program files directory:

Tess Models\Documentation\Controller Library

However, I suspect now that you don't have TESS libraries, so after looking around a bit in the component tree for non-TESS components, Type14e under Utility/Forcing Functions/Temperature is an option for you to use in conjunction with Type108 under Controllers\5-stage Room Thermostat.  Connect output 2 of Type14e into the "1st stage heating setpoint" (input 2) of Type108.

Kent Beason
Schlitterbahn Development Group
830-609-8904 m
 

-----Original Message-----
From: PAUL COALES [mailto:coalespr at btinternet.com] 
Sent: Monday, December 07, 2009 2:48 PM
To: trnsys-users at cae.wisc.edu; Kent Beason
Subject: RE: [TRNSYS-users] Type8a: Setback temperature issue

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
> 
> 
> 
> 
> 
>