Numerical simulation on heat storage performance of phase change energy storage floor heating system

Taking the problem of thermal environment control inside building with phase change material (PCM) floorboards as the background of the research, simulates the two-dimensional square cavity model with low-temperature radiation floor heating system using Fluent software, considers the variable property calculation and the coupled heat transfer process consists of solid-liquid phase change, heat conduction, natural convection and radiation in this physical model. Investigates the influence of phase change temperature and thermal conductivity of PCM on the air temperature in the cavity respectively. The results show that improving the thermal conductivity of PCM can reduce thermal inertia of the heating system, and accelerate the temperature rising in the cavity per hour. Obtains the relationship expression between phase change temperature and the air temperature in the cavity. Presents a new floor heat storage structure to increase the air temperature in the cavity, which provides a diverse energy utilization.