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International Journal of Environmental Science and Development, Vol. 2, No. 6, December 2011 Fig. 3. GAMBIT model of the TESD The PCM volume was recreated and meshed separately. This allowed us to obtain the exact volumes of the TESD and PCM container for meshing purposes. Next part is the numerical solutions of mass, Momentum and energy conservation equations. In this case, unsteady energy balance equation has been solved in solid phase and unsteady momentum and energy balance equation have been solved simultaneously in liquid phase for each control volume. After making intricate meshing in gambit, it is exported to Fluent and in 3D, simulations were made using the material properties in Table I. TABLE I: PROPERTIES OF PCM MATERIALS Phase Change Material Physical Parameters Wall Temperature in Kelvin (K) Viscosity (kg/m.s) Density (kg/m3) Heat conduction (W/m.K) Specific heat capacity (CP) (J/kg.K) Fig. 4. Temperature Contours of Paraffin wax Paraffin Sodium Acetate Wax Tri-hydrate Naphthalene 343 343 343 Fig. 5. Temperature Contours of TESD containing Paraffin wax Results Obtained for Sodium Acetate Tri-Hydrate 1.90 -* -* 900 1450 0.24 0.5 0.1221 2900 1088 1720 1140 B. NOTE*: These values of viscosity are not required as sodium acetate trihydrate doesn’t melt and naphthalene sublimes. VI. RESULTS AND DISCUSSION The transient temperature profiles have been obtained by solving unsteady energy balance equation using Fluent 6.2 version. The temperatures profiles have been estimated. As the natural convection was considered in liquid phase therefore, unsteady momentum and energy balance equation have been solved simultaneously in liquid phase. A. Results Obtained for Paraffin Wax The temperature contours in Fig. 4 and Fig. 5 clearly show the decrease in temperature of the coolant water from 343 K to 332 K. The PCM exhibits a temperature change of almost 16 K as observed from the above graphical images obtained through fluent analysis. We observe that the temperature contours in Fig. 6 and Fig. 7 clearly show the decrease in temperature of the coolant water from 343 K to 324 K. The PCM exhibits a temperature change of almost 25 K. as observed from the above graphical images obtained through fluent analysis. Fig. 6. Temperature Contours of Sodium acetate tri-hydrate 440PDF Image | Analysis of PCM Material in Thermal Energy Storage
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