In this study, xylitol penta myristate and xylitol penta laurate were prepared as novel solid-liquid phase change material by means of esterification reaction. These esters were characterized chemically using a Fourier transform infrared spectroscopy method. By using a differential scanning calorimetry method, the melting temperatures of xylitol penta myristate and xylitol penta laurate were measured as 50.28 and 43.53 degrees C, respectively, while their latent heat values were determined as 199.50 and 184.71 J/g, respectively. These results indicated that the synthesized esters had high latent heat of melting and suitable phase change temperatures for thermal energy storage applications. A thermal cycling test showed that the synthesized phase change materials had good thermal reliability after thermal 100 melting-freezing cycles. Thermogravimetric analysis results also revealed that the phase change materials have good thermal stability over their working temperatures.