[TRNSYS-users] Thermal mass is not considered in Type 56 simulation!!

[Mehrdad Farshchi]

Dear Jochen,



Thank you for your email. I have modelled and simulated a simple
rectangular building (15m x10m) in Sydney with Trnsys 17 software. Then
using the Trnsys library I have edited the building components in order to
make a heavy weight building as follows:



Floor = BST_H_FLO                   (see the figure attached)

External Wall = BST_H_EXT   (see the figure attached)

Roof= BST_H_ROO                  (see the figure attached)


Although Infiltration, Ventilation, Heating, Cooling and Comfort regime are
off, the observed thermal lag was very low (less than an hour). Even I
changed the wall concrete thickness to 0.4m and the result for the air
temperature (TAir_H_0.4) did not show any changes in terms of thermal lag
(please have a look at the graph attached)

Tambient: ambient temperature ,

TAIR_H_0.1:  air temperature of air node with above mentioned building
component and setting and

TAIR_H_0.4 : air temperature of air node with above mentioned building
component and setting the wall concrete thickness to 0.4m.



I wonder if you could please let me know how to resolve this issue.


 Kind Regards
Mehrdad





On Thu, Jul 17, 2014 at 6:40 PM, hotline <hotline at transsolar.com> wrote:

>  Dear Mehrdad,
>
>
>
> TYPE 56 considers thermal masses. I can imagine that you’ve set a high
> ventilation rates.
>
> If so, you might compare the surface temperatures or the operative
> temperature instead.
>
>
>
> Best
>
>
>
>
> *_________________________________________________________________________________________*
> *_________*
>
>
>
> *Jochen Lam*
>
> TRNSYS Software Team
>
>
> *Transsolar Energietechnik GmbH*
>
> Curiestraße 2
>
> 70563 Stuttgart
>
> Fax:        +49 711 67976-11
> Email:    jlam at transsolar.com
>
> Web:      www.trnsys.de
>
>
>
> *Von:* TRNSYS-users [mailto:trnsys-users-bounces at lists.onebuilding.org] *Im
> Auftrag von *Mehrdad Farshchimonfared
> *Gesendet:* Mittwoch, 16. Juli 2014 06:12
> *An:* trnsys-users at cae.wisc.edu
> *Betreff:* [TRNSYS-users] Thermal mass is not considered in Type 56
> simulation!!
>
>
>
> Dear Trnsys users,
>
>
>
> I have modelled a residential building with different building components
> (including different thermal masses) using Trnsys 3d, Type 56 . The
> simulation results show no thermal lag between hourly inside air
> temperature of each zone even if, the heavy materials are used. It is weird
> as it seems that Trnsys does not take into account the thermal mass of
> walls, floors and etc.
>
>
>
> Have you come across with this problem previously?
>
>
>
> If  yes, I wonder if you could please let me know how to resolve this
> issue as soon as possible.
>
>
>
>
>
>
>
>
>
> Kind Regards
>
> Mehrdad
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at lists.onebuilding.org
> http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
>
>
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