The Micro-Encapsulated Phase Change Materials (MEPCMs) with the melting point temperature of 28 °C was used as an energy storage medium to control the thermal behaviour of a heat exchanger. The NEPCM particles were mixed with Expanded Graphite (EG) microparticles to improve the heat transfer rate in the heat exchanger. The MEPCM particles are made of paraffin cores with a particle average size of 45 μm. The paraffin core of the particles can undergo a solid/liquid phase change and store a tremendous amount of thermal energy due to the latent heat of phase change. The heat exchanger is a copper pipe radiator with aluminium fins confined in either a bed of MEPCMs or a composite mixture of MEPCMs + Expanded Graphite (EG) microparticles. The thermophysical properties of MEPCMs and MEPCM + EG were measured. The outcomes show 132% enhancement in thermal conductivity and a 28% decrease in the sensible specific heat of the MEPCM + EG composite with the weight ratio of 70% MEPCM and 30% EG compared to pure MEPCM. The charging and discharging behaviour of heat exchanger for various flow rates and two cases of MEPCM and MEPCM + EG were studied experimentally. The results reveal that using EG notably enhances the heat transfer and capability of the heat exchanger during the charging and discharging process. Using MEPCM + EG reduces the temperature drop at the heat exchanger outlet about 15 °C compared to the case of pure MEPCM.

熔点为28°C的微胶囊相变材料（MEPCM）被用作能量存储介质，以控制热交换器的热性能。将NEPCM颗粒与膨胀石墨（EG）微粒混合以提高热交换器中的传热速率。MEPCM颗粒由石蜡核制成，平均粒径为45μm。由于相变潜热，颗粒的石蜡芯会经历固/液相变并存储大量的热能。换热器是一个铜管散热器，其铝翅片被限制在MEPCM的床层或MEPCM +膨胀石墨（EG）微粒的复合混合物中。测量了MEPCM和MEPCM + EG的热物理性质。结果表明，与纯MEPCM相比，MEPCM + EG复合材料的重量比为70％和30％EG时，导热系数提高132％，显热比重降低28％。实验研究了换热器在不同流量下的充放电性能，并分别研究了两种情况：MEPCM和MEPCM + EG。结果表明，使用EG可以显着增强热交换器在充放电过程中的传热能力。与纯MEPCM相比，使用MEPCM + EG可将热交换器出口处的温度降低约15°C。实验研究了换热器在不同流量下的充放电性能，并分别研究了两种情况：MEPCM和MEPCM + EG。结果表明，使用EG可以显着增强热交换器在充放电过程中的传热能力。与纯MEPCM相比，使用MEPCM + EG可将热交换器出口处的温度降低约15°C。实验研究了换热器在不同流量下的充放电性能，并分别研究了两种情况：MEPCM和MEPCM + EG。结果表明，使用EG可以显着增强热交换器在充放电过程中的传热能力。与纯MEPCM相比，使用MEPCM + EG可将热交换器出口处的温度降低约15°C。