[TRNSYS-users] heating control in type 56

David Bradley bradley at tess-inc.com
Tue May 31 09:13:35 PDT 2005

Dear Jörn,
   You are correct in your understanding that the Type56 internal heating 
and cooling mechanisms are ideal and that there should be no demand when 
the zone temperature is between the heating and cooling set point, 
regardless of the time step. If you are seeing such behavior, you should 
address the problem to your distributor.
Kind regards,

At 01:22 AM 5/27/2005, Jörn von Grabe wrote:
>dear all,
>the following situation occurred during a fairly simple simulation with 
>only one room, an irregular ventilation rate and an ambient temperature: 
>even though the room temperature was above the set temperature for the 
>heating the heating was turned on (sensible energy demand negative). at 
>first sight i thought this would happen because trnsys wants to avoid the 
>room temperature to drop below the set temperature during the time step. 
>but first of all it happens no matter how small my time steps are and 
>secondly it also happens even though the temperature increases due to the 
>heating (say 20° is my set temperature, 20,5° is my room temperature at 
>time step i and due to further heating it increases to 21° at time step 
>i+1). my question therefore is: can anyone explain to me the 
>trnsys-internal controlling mechanisms for heating? isn't it supposed to 
>be an ideal controller?
>thanks in advance,
>TRNSYS-users mailing list
>TRNSYS-users at engr.wisc.edu

Thermal Energy System Specialists (TESS), LLC
David BRADLEY                           2916 Marketplace Drive - Suite 104
Partner                                        Madison, WI 53719
Phone: (608) 274-2577 USA
Fax: (608) 278-1475
E-mail: bradley at tess-inc.com
Web Pages:  http://www.tess-inc.com     and      http://www.trnsys.com

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