Re: [TRNSYS-users] air temperature, type 56

["Diego A. Arias" <daarias@wisc.edu>]

Hi Timo,
By default, TRNBuild sets the capacitance of the zone as 1.2*Volume of 
the zone.  This value only takes into account the mass of the air.  You 
may want to increase that value to take into account the mass of the 
furniture and equipment, which may affect the transient performance of 
the zone.
Please let me know if this helps.

Diego

Timo Sengewald wrote:

> Hello all!
>  
> For a long time now I have been wondering about the behaviour of room 
> temperatures in type 56 zones. How is it that the air temperature 
> drops instantly after heat loads (computers, lights, users) are turned 
> off? In the attached file you will find an example result of a single 
> zone. I modeled a typical office application with an occupant, light 
> and some other gains. There is NO air change set for this zone. I 
> reality you encounter a completely different behaviour. After you left 
> the office on a sunny day and turned off your computer the 
> temperature wouldn't drop within minutes. Or am I wrong?
>  
>  
> Thanks for your help!
>  
>
> Best regards
>
>  
> Timo
>
>
>
> ________________________________________________
> Timo Sengewald
>
> BLS Energieplan GmbH
> Elsenstraße 106
> D-12435 Berlin
> Tel.: +49 30 53 32 81-0
> Fax: +49 30 53 32 81-40
>
>
> www.bls-energieplan.de
>
>  
>
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--

Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706