Applicability for heat storage of binary systems of neopentylglycol, pentaglycerine and pentaerythritol: A comparative analysis

We have studied the solid-solid transitions of mixtures of the polyols neopentylglycol (NPG), pentaglycerine (PG) and pentaerythritol (PE). Values of temperatures and heat of transition for the PE/PG binary system are given. We have observed an increase of these values with the concentration of PE. Our calorimetric results show that PE/PG, PG/NPG and PE/NPG systems are suitable for heat storage. Depending on the transition temperatures, these systems are available for different applications (solar heat, industrial process heat, airborne and waterborne heat for space heating). We have also analysed the thermal hysteresis of the transitions and its influence on the utilization of these mixtures for energy storage.