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

[David BRADLEY via TRNSYS-users <trnsys-users@lists.onebuilding.org>]

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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