Drywall: Phase-Change vs. Conventional
Building materials with phase-change properties that increases their effective thermal mass for thermal energy control and storage.
A phase-change material (PCM) is a substance with a high heat of fusion. When melting and solidifying at a certain temperature, these materials are capable of storing and releasing large amounts of energy. When such a material freezes, it releases large amounts of energy in the form of latent heat of fusion, or energy of crystallisation. Conversely, when the material is melted, an equal amount of energy is absorbed from the immediate environment as it changes from solid to liquid.
This property of PCMs can be used in a number of ways, such as thermal energy storage whereby heat or coolness can be stored from one process or period in time, and used at a later date or different location. The simplest, cheapest, and most effective phase change material is water/ice. A number of different materials---including eutectics, salt hydrates, and organic materials--- have been developed to offer products that freeze and melt like water/ice, but at temperatures from the cryogenic range to several hundred degrees centigrade.
The energy storage and release cycle can be daily, weekly or seasonal depending on the system design requirements. The output is always be thermal energy, but the input may be thermal or electrical energy. Thermal storage may provide "free cooling"
by operating cooling towers during the night, freezing the PCM energy storage, so it can provide cooling as it melts during the day. Thermal storage has long been known and can be cost-effective when used for peak demand clipping and in utility areas with time-of-day electrical rates.
Energy Savings: 15%
Energy Savings Rating:
Not rated. What's this?
|1||Concept not validated||Claims of energy savings may not be credible due to lack of documentation or validation by unbiased experts.|
|2||Concept validated:||An unbiased expert has validated efficiency concepts through technical review and calculations based on engineering principles.|
|3||Limited assessment||An unbiased expert has measured technology characteristics and factors of energy use through one or more tests in typical applications with a clear baseline. |
|4||Extensive assessment||Additional testing in relevant applications and environments has increased knowledge of performance across a broad range of products, applications, and system conditions. |
|5||Comprehensive analysis||Results of lab and field tests have been used to develop methods for reliable prediction of performance across the range of intended applications.|
|6||Approved measure||Protocols for technology application are established and approved.|