Giant chimney for air ventilation of metropolises

Abstract

In this paper, a novel application of a giant chimney is presented with the practical purpose of helping to ventilate and decrease the local air pollution in metropolises. The solar collector around the chimney absorbs solar radiations, so the air is heated as a result of enhanced greenhouse effect in the collector. The structure stays on a foundation and works on the buoyancy principle. The air density difference between the outside and inside of the chimney causes the stack pressure to be produced in the chimney. The equations describing the movement of the air flow have been introduced and simplified considering assumptions. Effects of the geometrical parameters of the chimney, ambient temperature, geographical location, and weather condition on the performance of the chimney have been studied. Results show that a chimney with high altitude, working in low ambient temperature and unstable weather conditions, and in expanded cities near sea level will typically produce better performance.