Phase Change Material (PCM) Latent Heat Value
Posted by Michael J. Witte on 03 May 2010 11:00 PM
Question: I am currently working on a project which use EnergyPlus for PCM (phase change material) performance assessment. I notice that PCM has latent heat, and I am struggling to find a correct field for me to submit the latent heat value for the PCM. would this affect the results whether the input of the latent heat value is there or not?

Answer: The PCM characteristics are entered using MaterialProperty:PhaseChange, as in example file CondFD1ZonePurchAirAutoSizeWithPCM.idf. This objects has inputs to specify a function of enthalpy vs. temperature. The latent heat is represented by a large change in enthlpy over a small change in temperature at the melting point. See figure in Input Output Reference (pdf page 132 in v5.0 docs).

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