Energy storage technology, particularly heat storage technology, can efficiently solve the intermittency issue of solar energy; thus, enhancing the quality and efficiency of the solar energy usage system. Stable energy flow output for the solar energy system is guaranteed upon this integration with the energy storage sections. A horizontal heat storage tank filled with paraffin and metal foam was designed to address the key problem of low thermal conductivity of phase change materials and low efficiency of heat storage/release systems. The solidification phase change behavior of paraffin-embedded metal foam was examined under the same heat storage condition (70.0 ℃) but at different cooling fluid temperatures (10.0 ℃, 15.0 ℃, 20.0 ℃, 25.0 ℃, and 30.0 ℃). The real-time position of the solidification front was captured by an HD camera, and the internal temperature response features during the solidification process were obtained from the measurements. The experimental findings revealed that the lower the temperature of the cold fluid, the faster the solidification rate. The total solidification time of paraffin was shortened by 52.0% when the cold fluid was 10.0 ℃ compared with the exothermic condition of 30.0 ℃. Although the axial position exerted little impact on the temperature development during the solidification process, the higher the vertical height of the measurement point at the same radial distance, the faster the temperature drop and the higher the temperature response rate. The temperature response rate of point 1a under cooling conditions of 10.0 ℃, 15.0 ℃, 20.0 ℃, 25.0 ℃, and 30.0 ℃ increased by 7.2%, 8.8%, 10.3%, 10.8%, and 11.7%, respectively, based on the temperature response value of point 1b. Providing guidance and help for the structural design and operation parameter selection of solid-liquid phase change applications, this study helps popularize the engineering application of heat storage tanks filled with metal foam.