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[EnergyPlus_Support] Re: variable specific heat
Thank you very much for your answer. I would have two other
questions:
Why in the report there are always 10 nodes even if there are only 3
layers?
Do you mean calculate Cp of the PCM layer as a ratio: h(T)/T with h
(T) the enthalpy vs temperature function introduced
in "MaterialProperty:TemperatureDep:CondFD"? Which node I have to
consider?
Thank you again.
Roberto
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Edwin Lee <leeed2001@...>
wrote:
>
> As far as I know, there is not a report variable for Cp in the
finite difference model. You can, however, report the nodal
temperatures, and from this, you can use your h vs. T data to
produce a Cp. I'm not completely sure why the Cp is not reported,
but if it were, there would be multiple Cp values for the layer (one
for each finite difference node within the PCM).
>
> Good luck,
> Edwin
>
> ----- Original Message ----
> From: roblollini <r.lollini@...>
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Sent: Wednesday, January 2, 2008 9:11:34 AM
> Subject: [EnergyPlus_Support] variable specific heat
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> I am simulating a building with a PCM layer in the
external wall. I
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> would like to know if there was an EnergyPlus report for the
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> variable: "specific heat" or "thermal mass", calculated by condFD
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> algorithm. I need such values to define monthly average thermal
mass
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> of a construction that have to be input in a non-dynamic monthly
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> energy balance calculation.
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> Thank you very much for any suggestion.
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> Roberto
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