Phase Change Materials
Wednesday, November 4, 2009 at 11:30AM 
Phase change materials (PCM) absorb extra heat that is present during the day, stores it, and releases it at a later time. This system provides for a more stable temperature during the day without large peaks of high or low temperatures (around 70 to 79 degrees F). The PCM will have a certain melting point that relates to the desired room temperature. When the temperature goes above the melting point, the material (usually a waxy material) will change from a solid to a liquid and absorb extra heat energy during the phase change process. Once the room temperature starts to get below the material’s melting point the material will change back to a solid, thus releasing the heat that was stored in the material.
PCM are compatible with steel and wood framing. They reduce the need for heating and cooling by increasing the efficiency of the system by 30-40 %. PCM can be incorporated into many different buildings components including, but not limited to walls, ceilings, and floor systems. A company out of Germany, BASF, has developed gypsum wall boards containing PCM that are capable of storing heat. PCM Smart boards are comparable to concrete and masonry on their heat storage ability, only these require far less material. 15 mm of Gypsum wall board with PCM has an equivalent heat storage capacity of 14 cm thick concrete or 36.5 thick brick wall.
Fun Fact: The PCM itself is formaldehyde free so it can be used in accordance with the solar decathlon!
Kyle Holman & Danny Tappel
Sources:
http://www.micronal.de/portal/streamer?fid=402747
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