Numerical Investigation of Entropy Generation in Stratified Thermal Stores

摘要

This paper investigates the nature of entropy generation in stratified sensible thermal energy stores (SSTES) during charging using a dimensionless axisymmetric numerical model of an SSTES. Time-varying dimensionless entropy generation rates and the cumulative entropy generation in SSTES were determined from finite volume computations. The aspect ratios (AR), Peclet numbers (Pe_D), and Richardson numbers (Ri), for the stores considered were within the ranges 1 ≤ AR ≤ 4, 5 × 10~3 ≤ Pe_D ≤ 100 × 10~3, and 10 ≤ Ri ≤ 10~4, respectively. Using the Bejan number (Be), the total entropy generation was shown to be almost entirely due to thermal effects in the SSTES. The Be is practically unity for most of the SSTES' charging duration. The contributions of radial thermal gradients to the thermal entropy generation were further shown to be largely negligible in comparison to the contributions of axial thermal gradients, except at low Ri. Entropy generation numbers, N_s, in the SSTES were also computed and found to increase with decreasing AR and Pe_D and with increasing Ri. Pe_D was found to have the most significant influence on N_s. Based on this axisymmetric analyses of time-varying entropy generation in SSTES, estimates have been obtained of (1) the relative significance of radial effects on entropy generation within SSTES and (2) the relative significance of viscous shear entropy generation mechanisms within SSTES.