[TRNSYS-users] Asking please

[David BRADLEY]

Amr,
   Please keep in mind that this is a user forum, not a technical 
support hotline. The idea of it is for users to assist each other 
although the developers do try and provide assistance to the user 
community here as well. If you need assistance quickly, I would 
recommend that you contact your distributor directly. Also, we are no 
longer officially supporting Trnsys version 16 as version 17 was 
released in 2010. Your questions, however, apply to both versions.

1. Trnsys does not have one single method for computing ground heat 
transfer; it depends on which component (which Type) you are using. The 
ground coupling components in the TESS Libraries node the ground and use 
a finite difference approach to model the conduction of energy through 
the ground.
2. I am not sure whether these are going to do you much good; not 
because there is no way to connect them to a building but because what 
happens in the building influences the ground temperature profile, which 
in turn influences the building. If you have measured the ground 
temperature profile in undisturbed ground (ie away from a building) then 
you can apply this profile for the far-field temperature using a ground 
coupling model. If you do not have a ground coupling model then there is 
a lot of literature in the field on how to appropriately couple a ground 
temperature to a building. These range from simply connecting a 
deep-earth temperature to the back side of the building floors to 
defining an equivalent thermal resistance to the back side of the ground 
slab and connecting the other side of the resistive layer to the ambient 
temperature. I would recommend that you look at the literature and 
choose a method that is appropriate to the data that you have and that 
is suitable to what you are trying to model.
3. If you are using Type56, look at the QCOMI and QCOMO outputs for the 
appropriate surfaces in your building.

Best,
  David





On 2/8/2013 03:26, AMR sayed wrote:
> Dear Mr. David & Mr.Matt Duffy
> I have two question please:
> /_Sorry i send it yesterday but i didn't get the answer_/
> 1-I want to know how Trnsys calculate heat transfer through the ground 
> ( the method).
> 2-I have the temperature of the ground at depth 0.5m every month.  How 
> i can input these temperature in TRNSYS 16.1.
> 3- How i can know the amount of heat trnsfer from the ground
> Best regards
> Amr Abdallah
>
>
>
>
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users

-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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