One effective measure for building energy reduction is to pigment coatings on building exteriors. Conventionally, most coatings are designed using single particle types. Due to the limited particle optical features, these coatings usually perform well in one performance (e.g., thermal aspect) but poorly in another (e.g., aesthetic aspect). Thus, in practice they may not be able to meet the user-required performance in both aspects. Using particles with complementary optical features, such requirements may be fulfilled. To this end, this study experimentally investigates double-layered coatings using two particle types (i.e., CuO and TiO₂) with complementary features. The performance of 24 coating samples is evaluated with selected total particle masses and mass ratios. Results show that in comparison with the conventionally designed coatings, the two proposed ones (i.e., TiO₂ - CuO and CuO - TiO₂ coatings) provide more performance alternatives under varied mass ratios; and they also present significant performance differences. For instance, when the TiO₂ mass ratio increases, the total solar reflectance of the CuO-TiO₂ coating increases slowly at first but quickly afterwards; while that of the TiO₂-CuO coating increases quickly in the beginning but experiences a slow increase afterwards. It also illustrates that as the same required performance is met, the final choice of the two coatings is mainly determined by the initial costs of the utilized particles. Considering the optimal design in practice, the proposed coating is modelled. Validation results are shown at last.

减少建筑物能耗的一种有效措施是在建筑物外部使用颜料涂料。通常，大多数涂料是使用单一颗粒类型设计的。由于有限的粒子光学特征，这些涂层通常在一种性能（例如，热方面）上表现良好，而在另一种性能（例如，美学方面）上表现较差。因此，实际上，它们可能无法在两个方面都满足用户所需的性能。使用具有互补光学特征的颗粒，可以满足这样的要求。为此，本研究通过实验研究了使用两种颗粒类型（即CuO和TiO ₂）具有互补功能。用选定的总颗粒质量和质量比评估24个涂层样品的性能。结果表明，与常规设计的涂层相比，两种建议的涂层（即TiO ₂ -CuO和CuO-TiO ₂涂层）在不同的质量比下提供了更多的性能替代方案。而且它们也表现出明显的性能差异。例如，当TiO _2的质量比增加时，CuO-TiO ₂涂层的总太阳反射率起初缓慢增加，但随后迅速增加。而TiO ₂-CuO涂层在开始时迅速增加，但之后缓慢增加。它还说明，在满足相同要求的性能的情况下，两种涂层的最终选择主要取决于所使用颗粒的初始成本。考虑到实践中的最佳设计，对建议的涂层进行了建模。最后显示验证结果。