## 1 Introduction  
With the development of science and technology, energy storage technology has been widely used in many practical applications [1; 2; 3; 4; 5]. In order to optimize the design of energy storage systems, it is important to accurately measure the thermophysical properties of a phase change material (PCM) used in an energy storage system, including the thermal conductivity, the heat of absorption, and the temperature range of the phase change. Furthermore, for a full-scale PCM product, it is necessary to measure the thermophysical properties of a PCM inside its container to determine whether the product is qualified. Therefore, an appropriate measurement method is needed. For the measurement of thermal conductivity for a solid PCM, the hot wire method [6; 7; 8], the HotDisk method [9; 10; 11], and the steady state method [12; 13; 14] are widely used. In addition, the steady state method, including the heat flow method analysis (HFMA) method, is generally used to measure the thermal conductivity of a full-scale product. However, the steady state method is susceptible to the influence of contact thermal resistance [15]. In order to minimize the impact of thermal contact resistance, a flexible material with a high thermal conductivity is added to the specimen,hot plate, and cold plate. Silicone grease is the most widely used material to reduce contact thermal resistance [16]. However, the maximum operating temperature of silicone grease is 300 \({}^{\circ}\)C, which limits the temperature range of a thermal conductivity measurement. Moreover, after heating, silicone grease will pollute the specimen, hot plate, and cold plate. Therefore, a compensation method is needed to reduce the impact of contact thermal resistance without polluting the specimen so as to achieve an accurate measurement of thermal conductivity. For the measurement of the heat of absorption and the temperature range of the phase change, differential scanning calorimetry (DSC) is widely used. For instance, [PERSON] et al. [17] measured the melting temperature and enthalpy variations of n-octadec paraffin and calcium chloride hexahydrate. [PERSON] et al. [18] tested the melting point and latent heat of Na\({}_{2}\)CO\({}_{3}\)-NaCl eutectic salt. This method requires very small samples of about 1-10 mg. Though it is possible to estimate the heat of absorption of a pure PCM during phase change process [19], it is obviously inappropriate for widely used composite materials. In order to test the heat of absorption of a larger specimen during the phase change process, [PERSON] et al. [20] proposed a temperature reference method called the T-history method. This method measures the phase change temperature range and latent heat of a PCM by comparing the step cooling temperature curve of a PCM with that of a comparative specimen. Several researchers improved this method in recent years [21; 22; 23]. Compared with the DSC method, this method requires larger samples of about 15 g.  
However, in practical applications, an appropriate method is still needed to measure the heat of absorption and phase change temperature range of a full-scale PCM product, even in a container. In 2012, based on the American Standard Test Method (ASTM) C518, [PERSON] et al. [24] proposed a new method called the dynamic heat flow meter analysis (DHFMA) method to measure the PCM content in gypsum board. Then, several researchers focused on this method, and a new ASTM standard called ASTM C1784 was established. [PERSON] et al. [25] carried out experimental and theoretical analyses on this method to measure the heat of absorption of fiber insulation materials containing a microcapsule PCM. In 2018, [PERSON] et al. [26] studied the thermal storage characteristics of two PCM-containing qualitative building materials by using this method, and they determined the temperature-dependent enthalpy functions for phase change.