Phase Change Materials (PCM) 5th Lecture By: Dr. Salahaddin Yasin

Outline Introduction What is a PCM PCM physical principle and behavior Water as a PCM PCM Classification PCM general applications PCM applications in building Case study PCM role in sustainability PCM challenges Further research Conclusions Suggestions

What is a PCM Definition A phase-change material (PCM) is a substance presenting a high heat of fusion, and capable of storing and releasing large amounts of energy. Heat energy is absorbed or released when the material changes from solid to liquid phase and vice versa, thus, being classified as latent heat storage (LHS) units.

PCM classification

PCM application in building ORGANIC INORGANIC Advantages ◦ availability in a large temperature range ◦ freeze without much super cooling ◦ ability to melt congruently ◦ self nucleating properties ◦ compatibility with construction materials ◦ no segregation ◦ chemically stable ◦ high heat of fusion ◦ safe and non-reactive ◦ recyclable ◦ high volumetric latent heat storage capacity ◦ low cost and easy availability ◦ sharp phase change ◦ high thermal conductivity ◦ non-flammable Disadvantages ◦ low thermal conductivity, ◦ low volumetric latent heat storage capacity ◦ flammable (depending on containment) ◦ high volume change ◦ super cooling ◦ segregation

PCM application in building • PCM integrated into the building structure