Preparation and heat storage/release behavior of latent heat storage gypsum-based building materials
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A new method to manufacture gypsum-based building materials with high latent heat storage capability is described. When expanded graphite is used as the adsorption medium for butyl stearate, an organic/inorganic phase-change composite is formed. This composite can be mixed with gypsum to manufacture a latent heat storage gypsum-based building material. Differential scanning calorimetry (DSC) test results indicate that the phase-change enthalpy value of this composite is similar to that of pure butyl stearate and that it therefore displays good thermophysical properties. We found that a mixture of gypsum with this composite should contain no more than 5 % of the latter to maintain the workability of the paste. The hardened gypsum–composite material exhibits some defects in the interface between the phase-change composite and the gypsum, but these do not seriously affect the strength of the gypsum product. The results of a temperature cycle test illustrate that gypsum containing 5 % phase-change composite can deliver high-performance heat storage/release. This characteristic of the composite will improve the inertia of ambient temperature fluctuations, making it applicable as a new building product that will conserve energy.
KeywordsPhase-change materials Latent heat storage Expanded graphite Butyl stearate Gypsum Building energy conservation
This work was sponsored by the Zhejiang Provincial Natural Science Foundation (LY12E08019), the National Basic Research Program of China (2009CB623203), and the Key Science and Technology Innovation Team of Zhejiang Province (2010R50034).
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