Knowledgebase: Building Envelope > Heat Transfer
Phase Change Material Enthalpy Values
Posted by Michael J. Witte, Last modified by Michael J. Witte on 28 November 2017 07:12 PM


Question: How to you calculate the enthalpy values for MaterialProperty:PhaseChange? 1. Choose a cold temperature and a small enthalpy value, such as 20C, and h1=0.1 J/kg 2. Calculate the enthalpy at the melting point(tMP) h2 = h1+(tMP  (20))*SpecificHeat 3. The melting stage needs a finite slope, so add 0.1 to the melting point and add the latent heat so, the third enthalpy pair is tMP+0.1, h2+LatentHeat 4. Then calculate a fourth point by choosing a high temperature such as 100C and then calculate the final enthalpy h4 = h3+(100  (tMP+0.1))*SpecificHeat  
