A major problem faced by Phase Change Materials (PCM) based latent heat thermal energy storage systems is the slow thermal response. In this study, the feasibility of nano phase change materials composites is investigated experimentally by using various types of nanoparticles in PCM, to improve thermal response by increasing the thermal conductivity. Heat transfer enhancement of PCM composites (RT26 and coconut oil) is achieved by acquiring better thermophysical properties through seeding nanoparticles in PCM. RT26 and coconut oil are beneficial due to the absence of corrosion to metallic containers. A thermal response investigation is conducted with a flat slab type latent heat thermal energy storage unit. It was observed that the increase in thermal conductivity of PCM by seeding nanoparticles is useful for the improvement of heat transfer. Carbon nanotubes have shown better performance as compared to Al₂O₃ and Fe₃O₄ nanoparticles. It was further analyzed that at a 1 wt percent concentration of nanoparticles, the maximum heat transfer enhancement in RT26 caused by Fe₃O₄, Al₂O₃ and carbon nanotubes nanocomposites is up to 20.01, 36.68 and 64.21% respectively. The maximum heat transfer enhancement in coconut oil caused by Fe₃O₄, Al₂O₃ and carbon nanotubes nanocomposites is up to 8.83, 14.84 and 33.38% respectively. Therefore, it is revealed that RT26 has more potential for heat transfer enhancement as compared to coconut oil. This is due to the percentage improvement in the thermophysical response of RT26 as compared to coconut oil. The economic and environmental analysis was conducted to compare the performance of latent heat thermal energy storage unit with and without the application of nanoparticles in PCM, to estimate the most viable candidate among various nano composites. The economic analysis presented the lowest annual energy running cost and Net Present Value(NPV) for nanocomposite of carbon nanotubes in RT26 is Rs.-4381 and RS.-36375 respectively. Whereas the maximum annual energy cost and NPV for pure RT26 are Rs.-12240 and Rs. -75548 respectively. The NPV for Fe₃O₄ and Al₂O₃ is Rs.-62207 and Rs.-53062 respectively. The cost and NPV were Rs.-6646 and Rs.-55226 in the case of carbon nanotubes in coconut oil. It shows that the trend is the same in the case of Fe₃O₄ and Al₂O₃ nanoparticles in both RT26 and coconut oil, unlike of carbon nanotubes. The environmental analysis shows that the maximum and minimum payments of carbon dioxide by carbon nanotubes and Fe₃O₄ nano composites respectively in RT26, are Rs.7000 and Rs.2176. While the corresponding values are Rs.2975 and Rs.798 in the case of coconut oil. Hence, carbon nanotubes in RT26 have the highest economic and environmental viability. Accordingly, the enhancement in heat transfer using these nanoparticles will be helpful in air conditioning applications like animal houses.

基于相变材料 (PCM) 的潜热热能存储系统面临的一个主要问题是缓慢的热响应。在这项研究中，通过在 PCM 中使用各种类型的纳米粒子，通过增加热导率来改善热响应，对纳米相变材料复合材料的可行性进行了实验研究。PCM 复合材料（RT26 和椰子油）的传热增强是通过在 PCM 中接种纳米颗粒获得更好的热物理特性来实现的。RT26 和椰子油对金属容器没有腐蚀是有益的。使用平板型潜热蓄热装置进行热响应研究。据观察，通过接种纳米颗粒提高 PCM 的热导率有助于改善传热。₂ O ₃和Fe ₃ O ₄纳米颗粒。进一步分析，当纳米颗粒浓度为1wt%时，Fe ₃ O ₄、Al ₂ O ₃和碳纳米管纳米复合材料在RT26中的最大传热增强分别高达20.01、36.68和64.21%。Fe ₃ O ₄ , Al ₂ O ₃对椰子油的最大传热增强作用和碳纳米管纳米复合材料分别高达 8.83、14.84 和 33.38%。因此，表明与椰子油相比，RT26 具有更大的传热潜力。这是由于与椰子油相比，RT26 的热物理响应百分比提高。进行经济和环境分析以比较在 PCM 中应用和不应用纳米颗粒的潜热热能存储单元的性能，以估计各种纳米复合材料中最可行的候选材料。经济分析表明，RT26 中碳纳米管纳米复合材料的最低年能源运行成本和净现值 (NPV) 分别为 Rs.-4381 和 RS.-36375。而纯 RT26 的最大年度能源成本和 NPV 为 Rs.-12240 和 Rs。-75548 分别。Fe 的 NPV₃ O ₄和Al ₂ O _{3 分别}是Rs.-62207和Rs.-53062。对于椰子油中的碳纳米管，成本和 NPV 分别为 Rs.-6646 和 Rs.-55226。它表明，与碳纳米管不同，RT26 和椰子油中的 Fe ₃ O ₄和 Al ₂ O ₃纳米颗粒的趋势是相同的。环境分析表明，碳纳米管和 Fe ₃ O ₄对二氧化碳的最大和最小支付RT26 中的纳米复合材料分别为 Rs.7000 和 Rs.2176。而椰子油的相应值为 2975 卢比和 798 卢比。因此，RT26 中的碳纳米管具有最高的经济和环境可行性。因此，使用这些纳米粒子增强传热将有助于空调应用，如动物房屋。