| Title |
Effect of Design Factors on the Performance of Stratified Thermal Storage Tank |
| Keywords |
Daguchi method ; 다구치방법 ; ANOVA ; 분산분석 ; Stratified thermal storage tank ; 성층축열조 ; Thermocline thickness ; 온도경계층 두께 |
| Abstract |
This study is to systematically analyze the effect of various kinds of design factors on the performance of stratified thermal storage tank. Taguchi method, known as a very reasonable tool in the parametric study, is employed in the present work. Three dimensional unsteady numerical experiment is conducted for 4 design parameters of stratified thermal storage tank: inlet Reynolds number, Froude number, diffuser size with 3 levels (Re＝400, 800, 1200, Fr＝0.5, 1.0, 2.0 and150mm, 200mm, 300mm) and diffuser shape with 2 levels. Orthogonal array L18(2×37) is adopted for the analysis of variance. The result gives quantitative estimation of the various design parameters affecting the performance and helps to select the main factors for the optimum design of stratified thermal storage tank. Reynolds number is found to be the most dominant parameter and the diffuser shape plays significant role on the performance of stratified thermal storage tank. Based on this finding, the prior questions on the contribution of the diffuser shape proposed by the authors become clear. The optimum condition for the performance is a set of300mm, Re＝800, and radial regulated plate diffuser. Conformation test shows the repeatability in the analysis and 1.3% difference between the estimated thermocline thickness and that of numerical result. |