Abstract
ABSTRACTIn order to determine optimal salt hydrates matching and adding fraction of Na2HPO4 · 12H2O, crystal characteristics, latent heat of phase change, supercooling degree, and phase change temperature were studied. According to experimental data, optimal salt hydrates matching and adding fraction of Na2HPO4 · 12H2O are determined by adopting multi-objective fuzzy optimization model based on analytic hierarchy process. Aimed at 3% Na2SiO3 · 9H2O-Na2HPO4 · 12H2O optimized by the method, thermal cycling performance test is implemented. Test results show the following: the Na2SiO3 · 9H2O-Na2HPO4 · 12H2O system has lower supercooling degree than Na2HPO4 · 12H2O. It forms stable crystal after multiple thermal cycles, the phase separation is eliminated completely, and supercooling degree is 3.6°C. Latent heat of phase change maintains at 164 J/g after 100 thermal cycles. It is a modified intermediate product of salt hydrates with development potential.
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