[TRNSYS-users] Thermal rockbed storage

[Diego A. Arias]

Dear Sansa,

Panta wrote:

> Dear Mr. David Bradeley,
>  
> I am having problems with thermal rockbed simulations in Trnsys and 
> those done in MathCad (I have simulated the thermal rockbed storage 
> based on your proposed equations given in the mathematical description 
> of the components).
>  
> *Regarding the TRNSYS.*
> I have just connected the type10 (rockbed storage) with type 65d 
> (online ploter) and I have varied the flow at the inlet of the reckbed.
> The bottom and top node temperatures are not changing.
> For exaple, Tinlet=51degC, m=20kg/s the results are 51degC for both cases.
> I did not change the values of other parameters. 

Is it possible that you have not changed the number of segments into 
which the rock bed should be divided?  If you click on the tab 
'Derivative', you will see a question regarding the number of segments.  
By default it is set to one, so you will not see any difference in 
temperature because there is only one node.
I hope this helps,

Diego


> *Regading the MathCad*
> I am getting the same results i.e. the top node and bottom node 
> temperatures are the same. In fact, I am getting small increase in 
> temperature (+0.02degC) towards bottom side.!
>  
> *Question*
> What seems to be the problem?
>  
> Thank for your time and consideration.
> Regards Sasa Pantic
>  
> Concordia University
> Building, Civil and Environmental Engineering department
> Montreal, Canada
>  
>  
>
>
>  
>
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-- 

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