Techno – economic analysis of ventilation driven through solar metallic wall for a hostel building of National Institute of Technology Raipur India

Abstract

The aim of present work is to investigate theoretically the ventilation flow rate produced using solar metallic wall system. In this effort, the effect of various design parameters on the performance of solar metallic wall system is evaluated under the climatic condition of Raipur (21.2514° N, 81.6296° E), Chhattisgarh. A computer simulation program based on the mathematical model of proposed system has been developed using MATLAB software. The performance of solar metallic wall system is evaluated by predicting the volumetric air flow rate. The effect of air gap, height and different metallic sheets are determined. It has been observed that with increase in air gap and height, volumetric air flow rate increases, about 203 % increase in volumetric air flow rate is observed for increase in air gap from 0.1 m to 0.5 m and 57 % increase in volumetric air flow rate is observed for increase in height from 1 m to 2 m. The best performance of solar metallic wall system is observed on using aluminium as metallic sheet as compared to the other chosen materials. The ratio of volumetric air flow rate obtained for iron, copper, and aluminium is 1, 1.11, 1.45 that shows, volumetric air flow rate for ventilation by metallic wall of aluminium is about 45% more than its competitor. Finally the system is proposed for a hostel of NIT Raipur and it is concluded that 3024 kWh per year of energy is saved if solar metallic wall is used in place of conventional electrical system. The amount of carbon-dioxide emitted to atmosphere is also reduced by 0.02 tonne per year. The payback period of total solar metallic wall units required in place of exhaust fans to completely ventilate the hostel building during day hours is coming out to be 7 years and 8 months.