Application Of The Inorganic Phase Change Material Sodium Sulfate Decahydrate And The Organic Phase Change Material Paraffin

As energy storage materials, phase change materials have latent heat and stable performance. During phase transformation, the phase change materials can absorb heat(cold) from the enveironment and release heat(cold) when required, and its temperature does not change, so as to control the ambient temperature. As energy storage carrier, phase change materials can ease the energy shortage problem.Compared to other phase change materials, sodium sulfate decahydrate and paraffin have latent heat, stable performance, non-toxic, cheap and easy to get. But sodium sulfate decahydrate is prone to supercooling, phase separation and agglomeration in the crystallization, and paraffin’s liquid phase is easy to leak, which limits their application.Phase change thermal storage systerm with the sodium sulfate decahydrate as the main component was prepared, its phase transition temperature is room temperature and has excellent performance. Ultimately determine thebest recipe of the thermal storage with high enthalpy(107.5 J·g-1) and the transition temperature is room temperature. The best recipe: sodium sulfate decahydrate 75.4%, water 12%, borax 3.0%, carboxymethylcellulose 2.0%, sodium dodecylbenzenesulfonate 0.23%, sodium dodecylsulfate 0.12%, potassium aluminum sulfate dodecahydrate 0.40%, ethylenedia minetetraacetic acid disodiun salt 0.75%,sodium hexametaphosphate 0.15% and NaCl 6.0%.Microcapsule of phase change materials was prepared by in-situ polymerization with melamine-formaldehyde resin as shell and paraffin as core.The best experimental condition: melamine 7 g, formaldehydy 13 mL, emulsifier TA 5 g, emulsifier water 150 mL, stirring speed 1500 r/min, the ratio of the core/wall in the microcapsules was 5.6:1.In this paper, the inorganic phase change material Na2SO4·10H2O and the organic phase change material praraffin were studied respectively. The phase change materials were tested and characterized by fourier transform infrared spectroscopy, differential scanning calorimetry and scanning electron microscope.