## 4 Experimental Results  
### Thermophysical Properties of n-docosane in the Container  
The thermophysical properties of n-docosane in the container include the thermal conductivity of the solid phase, the heat of absorption, and the phase change temperature range. In order to verify the measurement result of the heat of absorption, the latent heat of n-docosane was also calculated to compare with the DSC results. At the beginning, the n-docosane with 8.8 mg was tested by DSC to provide a reference for the full-scale measurement. The results of DSC show that the initial phase change temperature of n-docosane was 42.9 \({}^{\circ}\)C and the latent heat was 256.9 J/g. Figure 7: The fitting curve of correction coefficient varying with temperature. Based on the DSC results, n-docosane is a solid specimen when the temperature is below 40 \({}^{\circ}\)C. Thus, the temperature of one plate was set to 40 \({}^{\circ}\)C, and the other plate was regarded as the cold plate in order to measure the thermal conductivity. Figure 8 shows the curves of the testing results of heat fluxes and temperatures. It shows that the temperatures on both plates were 40.0 \({}^{\circ}\)C and 28.9 \({}^{\circ}\)C, respectively. Besides, the average heat flux across the specimen was 60.92 W/m\({}^{2}\). Based on the testing results, the values of contact thermal resistances were calculated by Equation (21) and Equation (22). The results show that the contact thermal resistances at both ends of the full-scale specimen were 0.0186 m\({}^{2.\circ}\)C/W and 0.0198 m\({}^{2.\circ}\)C/W, respectively. Then, the thermal resistance of n-docosane inside the full-scale specimen was 0.1431 m\({}^{2.\circ}\)C/W, which was calculated using Equation (6). Therefore, the thermal conductivity of n-docosane was 0.280 W/m\({}^{.\circ}\)C, with a mean temperature 34.5 \({}^{\circ}\)C. If the contact thermal resistance is not taken into consideration, the testing result would be 0.221 W/m\({}^{.\circ}\)C, with a mean temperature of 34.4 \({}^{\circ}\)C. In order to verify the accuracy of the measurement result, a HotDisk analyzer was used to measure the thermal conductivity at 35.0 \({}^{\circ}\)C. The measurement result was 0.275 W/m\({}^{.\circ}\)C. It can be calculated that the deviation was 19.6% without considering the contact thermal resistance, while the deviation was 1.8% when the contact thermal resistance was taken into consideration. In order to obtain the function of thermal conductivities of n-docosane varying with temperatures, the heating temperatures were set to 38 \({}^{\circ}\)C and 35 \({}^{\circ}\)C using the same method, so the mean temperatures of the specimen were 32.8 \({}^{\circ}\)C and 30.2 \({}^{\circ}\)C, respectively. In addition, the HotDisk analyzer was used to measure thermal conductivity at 30 \({}^{\circ}\)C for comparison. Figure 9 gives the thermal conductivities of n-docosane by using the method in this paper and HotDisk analyzer at different temperatures. Figure 8: The curves of testing results of heat fluxes and temperatures. Figure 9: Thermal conductivities of n-docosane at different temperatures. Therefore, the fitting result of solid thermal conductivity of n-docosane measured in this paper is expressed in Equation (26). It can be calculated that the thermal conductivity of n-docosane at 25 \({}^{\circ}\)C was 0.258 W/m-\({}^{\circ}\)C. Some references show that the thermal conductivity of n-docosane ranges from 0.22 to 0.26 W/m-\({}^{\circ}\)C at room temperature [7; 28; 29]. Moreover, [PERSON] et al. [30] noticed that the thermal conductivity of n-docosane increases when the temperature increases. Therefore, the measurement results are reliable. \[\lambda_{\text{C22}}=0.00226\times T+0.20168 \tag{26}\]  
Then, the total heat of absorption, the phase change temperature range, and the latent heat were measured by the DHFMA method. The mass of n-docosane in the container was 2.614 kg.