Phase Change Materials

When the temperature becomes warmer, PCMs liquefy and absorb and store heat, thus cooling the house.

Tell us what you think about this technology

Phase Change Materials, if not thoroughly understood, are easily misapplied and then denounced because the product did not perform to perceived expectations. For example, housewrap would not be a good application for PCMs. During the winter months in the NE region, the housewrap may adsorb a winter sun's heat - however, if the house is properly sealed and insulated, the effect will be minimal on the interior of the home because the heat will not migrate. In fact, PCM would be detrimental because you would want heat transference to the interior if it were possible. In the summer, the heat could be adsorbed during the day, but if the night temperature was not extreme enough (and in the NE the night time summer temps don't generally go below 65F) the heat would not be released - again no effect. Homes in desert climates could, however, well benefit from the application of PCMs but generally don't use a housewrap product. PCM is a sound technology but any industry considering it needs to understand that there is no one product that fits all needs, and that the application under all conditions must be well understood before using it.

Janice D. , Ahlstrom

Windsor Locks, CT

12/14/2005

Disclaimer: The information on the system, product or material presented herein is provided for informational purposes only. The technical descriptions, details, requirements, and limitations expressed do not constitute an endorsement, approval, or acceptance of the subject matter by the U.S. Department of Housing and Urban Development (HUD/FHA), The Partnership for Advancing Technology in Housing (PATH), or any PATH-affiliated Federal agency or private company. There are no warranties, either expressed or implied, regarding the accuracy or completeness of this information. Full reproduction, without modification, is permissible.