A kind of testing method of thermal conductivity of phase change energy storage material
A technology of phase change energy storage materials and testing methods, applied in the field of phase change energy storage materials, can solve problems such as dehydration, easy deformation during testing and transfer, large deviation, etc., and achieve the effect of ensuring stability and reliability
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Embodiment 1
[0083] The purpose of this embodiment is to measure the CaCl in the cooling crystallization process. 2 ·6H 2 O at 29.2°C (i.e. the temperature to be measured T 0 ) at the thermal conductivity.
[0084] Specifically, the following steps are used for determination:
[0085] First, use DSC to test the empty sample pan (i.e. with a blank crucible as the background), water (m(H 2 O)=5.705mg) and CaCl 2 ·6H 2 O(m(Sam)=4.190mg) heat flow P(Bla), P(H 2 O) and P(Sam), the cooling rate is 10°C / min; the heat flow test results are as follows image 3 shown.
[0086] Then, 80mL of water (m'(H 2 O)=80.02g) and CaCl 2 ·6H 2 O(m'(Sam)=119.05g) were placed in figure 2 In the shown test tube 11, the test tube 11 is first placed in an ice-water bath, and shaken to make it crystallize at a temperature greater than 0°C (ice-water bath), CaCl 2 ·6H 2 Immediately after the O started to crystallize it was transferred to a 25 °C figure 1 In the water bath shown, and keep the water level...
Embodiment 2
[0091] The purpose of this embodiment is to measure the CaCl in the heating and melting process. 2 ·6H 2 O at 28.9°C (i.e. the temperature to be measured T 0 ) at the thermal conductivity.
[0092] Specifically, the following steps are used for determination:
[0093] First, use DSC to test the empty sample pan (i.e. with a blank crucible as the background), water (m(H 2 O)=5.705mg) and CaCl 2 ·6H 2 O(m(Sam)=4.190mg) heat flow P(Bla), P(H) heated between 30°C and 35°C 2 O) and P(Sam), the heating rate is 10°C / min; the heat flow test results are as follows image 3 shown.
[0094] Then, 80mL of water (m'(H 2 O)=80.02g) and CaCl 2 ·6H 2 O(m'(Sam)=119.05g) were placed in figure 2 In the test tube 11 shown, put the test tube 11 in a temperature of 35°C figure 1 In the water bath shown, and keep the water level line of the water bath and the water and CaCl in the test tube 2 ·6H 2 The surface of O is flat, water and CaCl are measured 2 ·6H 2 The temperature rise cu...
Embodiment 3
[0102] The purpose of this embodiment is to measure the CaCl in the heating process 2 ·6H 2 O liquid at 32.3 ℃ (that is, the temperature T to be measured 0 ) at the thermal conductivity.
[0103] Specifically, the following steps are used for determination:
[0104] First, use DSC to test the empty sample pan (i.e. with a blank crucible as the background), water (m(H 2 O)=5.705mg) and CaCl 2 ·6H 2 O(m(Sam)=7.590mg) heat flow P(Bla), P(H) heated between 29.5℃~35.0℃ 2 O) and P(Sam), the heating rate is 5°C / min; the heat flow test results are as follows Figure 5 and Figure 6 shown. From Figure 5 and Figure 6 It can be known that P(H 2 O)-P(Bla)=-1.863mW, P(Sam)-P(Bla)=-1.411mW; and it can be known from Example 2 that CaCl 2 ·6H 2 The average phase transition temperature of O in the heating process is 28.95°C, thus, the temperature T to be measured in this embodiment 0 With the sample to be tested CaCl 2 ·6H 2 The phase transition temperature T(Sam) of O is inc...
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Abstract
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