PARAMETRIC STUDY OF TRANSIENT VERTICAL SOLAR CHIMNEY RESPONSES AS A PASSIVE VENTILATION SYSTEM

• Main Author: Ali Verdino, Mikhail
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/79540
• Institution: Institut Teknologi Bandung

The solar chimney design is one of the many passive ventilation systems which received increasing attention from previous years prior. Though, transient solar chimney performance evaluations has yet to be conducted as much before due completion of this study. This report is then aimed at communicating results from a parametric study of transient vertical solar chimney response as a passive ventilation system to propose extra design considerations and or support findings within the literature. This study leverages the respons surface methodology to fulfill its purposes. Data used in the analysis are numerical results gained from fluid simulations for a period of one hour under 500 Wm?2 of solar irradiation. Number of configurations evaluated is generated with the Central Composite Design (CCD) of experiments for a total of nine cases. Considered design parameters include chimney gap height and width, respectively modelled for values ranging in 0.15–1 m and 1–2.5 m. Response surface models are fitted with regression for the air velocity change per characteristic velocity of bouyant flow ratio and thermal efficiency. Implications to other solar chimney performance metrics are then extrapolated from resulting models. Out of the two design parameters studied, namely chimney gap height and width, gap height is found to have the most impact in the positive direction for air velocity and the inverse for air temperature and the velocity growth to natural flow characteristic velocity ratio. Channel gap height’s contribution in the model’s prediction accuracy of each responses are reported to be 0.01 R2 (1%), 0.07 R2 (7.3%), and 0.37 R2 (70%) respectively. Interaction effect contributions in the form of channel area and gap height to width ratio are found dominant in the betterment of thermal efficiency prediction accuracy valuing at 0.35 R2 (71.4%). The main inference of this study’s evaluation into solar chimney design parameter effects follows that tightening chimney gap height would result in an overwhelmingly restrictive flow resistance, baring any chance for occuring Bouyancy to develop the flow.