Albaldawi, R.A., Shyaa, A.K. and Hammendy, B.M. (2015) “Experimental Study on the Effect of Insertion of Copper Lessing Rings in Phase Change Material (PCM) on the Performance of Thermal Energy Storage Unit”, Al-Khwarizmi Engineering Journal, 11(4), pp. 60–72. Available at: https://www.alkej.uobaghdad.edu.iq/index.php/alkej/article/view/265 (Accessed: 18 July 2026).