Phase Change Materials (PCMs) have being used in different solar energy systems for thermal energy storage and performance enhancement. Improving heat transfer from PCMs leads to reductions in charge and discharge durations, which makes them more favorable as storage units. Dispersion of conductive solid materials with nano dimensions is a practical approach to enhance their thermal features. Several nano-sized materials have been added to PCMs to improve their heat/cool storage abilities. The studies in this field reveal that employing nanotechnology is an efficient method for heat transfer improvement. In the current article, studies concerning applications of nanotechnology in PCMs are reviewed. According to the results, employing nanotechnology can noticeably enhance the heat transfer rate, which results in a reduction of charge and discharge times of the storage units equipped with the PCMs. The enhancement in the melting process of nano PCMs, which indicates the storage performance, depends on several factors such as concentration and kind of solid nano-sized particles, type of base PCM and the parameters related to operating conditions such as Rayleigh and Darcy numbers. The improvement in thermal performance due to nano PCMs is mainly attributable to the increased thermal conductivity and decrease in latent heat of fusion, which accelerates the melting/solidification processes.

相变材料 (PCM) 已被用于不同的太阳能系统，以实现热能存储和性能增强。改善来自 PCM 的热传递导致充电和放电持续时间的减少，这使得它们更适合作为存储单元。分散具有纳米尺寸的导电固体材料是增强其热特性的实用方法。已将几种纳米尺寸的材料添加到 PCM 中以提高其热/冷存储能力。该领域的研究表明，采用纳米技术是一种有效的传热改进方法。在当前的文章中，回顾了有关纳米技术在 PCM 中的应用的研究。结果表明，采用纳米技术可以显着提高传热率，这导致配备 PCM 的存储单元的充电和放电时间减少。表示存储性能的纳米 PCM 熔化过程的增强取决于几​​个因素，例如固体纳米尺寸颗粒的浓度和种类、基础 PCM 的类型以及与操作条件相关的参数，如瑞利数和达西数。纳米 PCM 的热性能改善主要归因于热导率的增加和熔化潜热的降低，这加速了熔化/凝固过程。基本 PCM 的类型以及与操作条件相关的参数，例如瑞利数和达西数。纳米 PCM 的热性能改善主要归因于热导率的增加和熔化潜热的降低，这加速了熔化/凝固过程。基本 PCM 的类型以及与操作条件相关的参数，例如瑞利数和达西数。纳米 PCM 的热性能改善主要归因于热导率的增加和熔化潜热的降低，这加速了熔化/凝固过程。