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RE: [EnergyPlus_Support] Discrepancy in PCM Results
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- Subject: RE: [EnergyPlus_Support] Discrepancy in PCM Results
- From: "Griffith, Brent" <brent.griffith@xxxxxxxx>
- Date: Thu, 16 Aug 2012 16:10:40 -0600
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- Thread-topic: [EnergyPlus_Support] Discrepancy in PCM Results
The data are interpolated along a piece-wise linear relationship, it is not a ?staircase? as you describe. Intermediate points that don?t change the linear function are superfluous, but here your (a) and (b) are totally different between 0 and 26C. In the case of (a) there is a gradual increase from 0 to 26C, but in case (b) all the increase occurs between 24 and 26C.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Niraj Poudel
Sent: Thursday, August 16, 2012 3:47 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Discrepancy in PCM Results
Dear all,
I have defined a PCM (26 degree melt, 230 KJ/Kg enthalpy) using the Enthalpy-Temp curve two different ways using the object Materialproperty:phase change and applied it to the interior face of the east wall.
a) Gypsum Board PCM:
Temp - 0
Enthalpy - 0
Temp-26
Enthalpy-230000
Temp-100
Enthalpy-230000
b) Gypsum Board PCM1
Temp-0
Enthalpy-0
Temp-20
Enthalpy-0
Temp-24
Enthalpy-0
Temp-26
Enthalpy-230000
Temp-28
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