Analysis of exergy in a dimple-roughened solar thermal collector using MATLAB simulation

초록

In the current study, the performance of a dimple-roughened solar thermal collector (DRSTC) is investigated within a (Rexx${\text{Re}}_{\text{xx}}$) range that spans from 3000 to 48,000. Under constant solar intensity (Isr$I_{\text{sr}}$=1000 Wm-2$\text{Wm}{<}^{>}-2$), relative roughness height (ed/Dh$e_{\text{d}}/D_{\text{h}}$) varied from 0.021 to 0.036, relative roughness pitch (p/ed$p/e_{\text{d}}$) from 10 to 20, arc angle (alpha a${\alpha }_{\text{a}}$) from 45 to 60 degrees, and temperature rise parameter from 0.003 to 0.02, and the proposed model predicts exergy efficiency of the SAH, and the results obtained can be used as reference for the design of new solar thermal systems. The assessment makes use of advanced MATLAB simulations in order to evaluate the exergetic efficiency (eta ex)$({\eta }_{\text{ex}})$ of a DRSTC. At lower Rexx${\text{Re}}_{\text{xx}}$ values, (eta ex)$({\eta }_{\text{ex}})$ increases uniformly; however, stabilization and decline occur at higher Rexx${\text{Re}}_{\text{xx}}$ values. The highest (eta ex)$({\eta }_{\text{ex}})$ for the DRSTC is 1.47% under a temperature rise parameter (Delta T/Isr)$(\Delta T/I_{\text{sr}})$ of 0.0071 Km2W-1$\text{Km}{<}^{>}2\text{W}{<}^{>}-1$ for obtaining optimum values of ed/Dh$e_{\text{d}}/D_{\text{h}}$ = 0.036, p/ed$p/e_{\text{d}}$ = 10, and alpha a${\alpha }_a$ = 60 degrees. This research illustrates the usefulness of MATLAB for solar energy system analysis and optimization by integrating simulation and experimental data. This investigation further supports the feasibility of the proposed collector design.

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