A two-dimensional transient analytical model was developed to study and evaluate high-temperature phase-change thermal energy storage systems for space applications. Parametric studies were performed in order to assess the effects of various thermal and geometric parameters on the heat transfer process and on the performance of the energy storage system. The analytical model was developed for the two dimensional tube and shell configuration with internal longitudinal fins included inside the phase change material in the study liquid phase thermal conductivity was taken to be different from that of the solid phase. The effects of convective currents in the liquid phase were also accounted for. The enthalpy approach (where both enthalpy and temperature are the dependent variables) was used to develop the describing equations. The Gauss-Seidel iterative scheme with successive over-relaxation was used to numerically solve the resulting non-linear simultaneous finite-difference equations. The model was then used to study the effects of various geometric and thermal parameters such as tube and shell diameters, fin number initial system temperature, film heat transfer coefficient, liquid phase thermal conductivity and inlet-outlet temperature of secondary fluid for heating/cooling. Studies were also performed to evaluate the effects of these parameters on the cyclic heating and cooling modes of the system.
Parametric study of phase change thermal energy storage systems for space applications
Parameterstudie von Latentwaermespeichersystemen fuer die Raumfahrt
24th Nat. Heat Transfer Conf. ; 84 , 263 ; 169-176
1988
8 Seiten, 8 Bilder, 7 Quellen
Conference paper
English
Unified Transient Response of a Phase-Change Thermal Energy Storage for Space-Based Applications
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