科研之友
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摘要
Coatings applied on buildings are expected to perform well in both thermal and aesthetic aspects. Single-particle coatings can only perform satisfactorily in one of the two aspects, while mixed-particle coatings utilizing particles with complementary properties show substantial potentials to achieve desirable per-formance in both aspects. For accurate performance quantification of a mixed-particle coating at vary-ing composition percentages, conventional experiment-based methods are time-consuming and costly, and thus numerical model-based methods are critically needed. However, existing models require the knowledge of the complex mixing conditions which is challenging/even impossible to acquire in practice, thereby deteriorating their accuracies and applicability. For this reason, this study proposes a novel model in which the performance of the mixed-particle coating is quantified on the basis of two double-layered coatings that can be easily and accurately modelled using existing techniques. The proposed model is ex-perimentally validated using 15 coating samples. Compared with a typical conventional model, the pro-posed model substantially improves the accuracy of performance quantification at varying composition percentages. For instance, the accuracies of the thermal and aesthetic performance quantifications have been improved by 17.7% and 20.3%, respectively. Moreover, as the proposed model does not require the knowledge on the complex mixing conditions, it is easy and convenient to be implemented in practice. Such an accurate and easy-to-be-used model will help improve the design of mixed-particle coatings for achieving desirable aesthetic performance.
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单位1; 西安交通大学; 中山大学
