# X-ray Diffraction Study of Metallized Polyethylene for Creating Heat Storage Systems
## 3 Results and Discussion
For a material that does not undergo phase transitions during heating, the amount of stored energy can be calculated following the formula:  
\[\text{Q}=\text{Cp}\cdot\Delta\text{T} \tag{4}\] \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \begin{tabular}{c} **Number of Heating** \\ **and Cooling Cycles** \\ \end{tabular} & \begin{tabular}{c} **Degree of** \\ **Crystallinity** \\ \end{tabular} & **Position** & **Height** & **Width** & \begin{tabular}{c} **Size** \\ **L** \\ \end{tabular} & \
\begin{tabular}{c} **Distance** \\ **d** \\ \end{tabular} &
\begin{tabular}{c} **QPE** \\ **kJ/kg** \\ \end{tabular} \\ \hline \multirow{4}{*}{1} & \multirow{4}{*}{0.501} & 21.1 & 386.4 & 0.5 & 187.5 & 4.2 & \multirow{4}{*}{996.2} \\ \cline{3-4}  & & 23.5 & 128.0 & 0.6 & 151.3 & 3.8 & \\ \cline{3-4}  & & 20.1 * & 54.0 & 5.3 & - & - & \\ \hline \multirow{4}{*}{100} & \multirow{4}{*}{0.494} & 21.2 & 476.6 & 0.5 & 196.6 & 4.2 & \multirow{4}{*}{990.5} \\ \cline{3-4}  & & 23.5 & 117.0 & 0.6 & 124.4 & 3.8 & \\ \cline{3-4}  & & 20.0 * & 65.2 & 4.8 & - & - & \\ \hline \multirow{4}{*}{200} & \multirow{4}{*}{0.459} & 20.9 & 399.4 & 0.5 & 178.0 & 4.3 & \multirow{4}{*}{962.1} \\ \cline{3-4}  & & 23.2 & 112.5 & 0.7 & 133.8 & 3.8 & \\ \cline{3-4}  & & 19.9 * & 75.1 & 4.7 & - & - & \\ \hline \multirow{4}{*}{300} & \multirow{4}{*}{0.405} & 21.2 & 336.3 & 0.5 & 179.6 & 4.2 & \multirow{4}{*}{918.3} \\ \cline{3-4}  & & 23.6 & 61.8 & 0.7 & 132.2 & 3.8 & \\ \cline{3-4}  & & 20.1 * & 72.4 & 5.6 & - & - & \\ \hline \multirow{4}{*}{400} & \multirow{4}{*}{0.284} & 21.1 & 187.2 & 0.6 & 156.6 & 4.2 & \multirow{4}{*}{820.0} \\ \cline{3-4}  & & 23.5 & 50.8 & 0.8 & 118.3 & 3.8 & \\ \cline{3-4}  & & 20.0 * & 70.7 & 5.7 & - & - & \\ \hline \multirow{4}{*}{500} & \multirow{4}{*}{0.268} & 21.0 & 182.4 & 0.6 & 160.3 & 4.2 & \multirow{4}{*}{807.0} \\ \cline{3-4}  & & 23.4 & 38.0 & 0.8 & 108.7 & 3.8 & \\ \cline{3-4}  & & 19.8 * & 73.6 & 6.0 & - & - & \\ \hline \multirow{4}{*}{600} & \multirow{4}{*}{0.248} & 21.0 & 175.2 & 0.5 & 165.2 & 4.2 & \multirow{4}{*}{790.8} \\ \cline{3-4}  & & 23.4 & 47.0 & 0.7 & 124.5 & 3.8 & \\ \cline{3-4}  & & 19.8 * & 73.9 & 6.5 & - & - & \\ \hline \multirow{4}{*}{700} & \multirow{4}{*}{0.224} & 21.0 & 172.8 & 0.6 & 161.6 & 4.2 & \multirow{4}{*}{771.3} \\ \cline{3-4}  & & 23.4 & 40.1 & 0.8 & 113.7 & 3.8 & \\ \cline{3-4}  & & 19.8 * & 71.1 & 6.2 & - & - & \\ \hline \multirow{4}{*}{800} & \multirow{4}{*}{0.209} & 21.0 & 164.3 & 0.6 & 162.7 & 4.2 & \multirow{4}{*}{759.1} \\ \cline{3-4}  & & 23.3 & 36.0 & 0.8 & 117.7 & 3.8 & \\ \cline{3-4}  & & 19.8 * & 75.4 & 6.9 & - & - & \\ \hline \multirow{4}{*}{900} & \multirow{4}{*}{0.196} & 21.0 & 153.7 & 0.5 & 163.7 & 4.2 & \multirow{4}{*}{748.6} \\ \cline{3-4}  & & 23.3 & 44.7 & 0.7 & 122.2 & 3.8 & \\ \cline{3-4}  & & 19.7 * & 72.6 & 6.8 & - & - & \\ \hline \multirow{4}{*}{1000} & \multirow{4}{*}{0.192} & 20.9 & 145.4 & 0.6 & 159.7 & 4.2 & \multirow{4}{*}{745.3} \\ \cline{3-4}  & & 23.3 & 50.2 & 0.8 & 107.7 & 3.8 & \\ \cline{3-4}  & & 19.3 * & 62.8 & 6.7 & - & - & \\ \hline \hline \end{tabular}  
*—amorphous phase.  
\end{table} 
Table 4: The results of parameter calculations of the crystalline peaks and the amorphous phase of the heat-accumulating material obtained from metallized polyethylene granules as well as the amount of heat accumulated in 1 kg of polyethylene. where Cp is the specific heat capacity of polyethylene (we will take the average value of the heat capacity in the solid and molten state), and \(\Delta\)T is the difference between the initial and final heating temperatures (25 and 270 \({}^{\circ}\)C, respectively).