[TRNSYS-users] Fluid Specific Heat as a function of temperature

[David BRADLEY via TRNSYS-users]

Rasyiddin,

   The equation dq/dt = m*Cp*dT/dt is derived with the assumption that 
the specific heat is constant over the temperature range. If the 
specific heat is not constant over the temperature range then you would 
have to rederive all of the energy transfer terms in the effected Types 
to account for the dCp/dt term. You would then need to modify the Types' 
source code and recompile.

   There are some components in the TESS High Temperature Solar library 
that allow Cp to change. If you have access to that library, it might be 
worth a look.

kind regards,

  David



On 05/01/2017 23:17, Rasyiddin Muhammad via TRNSYS-users wrote:
> Hi,
>
> I am trying to change the fluid for a solar thermal system from water 
> to therminol 66. Thus, I would like to change the specific heat 
> capacity to a function of temperature instead of having a single 
> average value.
> Is there a way that I can do this?
>
> Also is there a way that I can change the fluid properties for the 
> whole system so that I would not have to change the fluid properties 
> for each component?
>
> Any help would be appreciated.
> Thanks!
>
> Rasyiddin
>
>
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> TRNSYS-users at lists.onebuilding.org
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-- 
***************************
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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