Department of Physics

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Browsing Department of Physics by Author "Sumaira Yaseen"

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    Suppressing Air Pollution in Metropolitan City by Solar Chimney Using Helio-aero- gravity Principle
    (University of Management and Technology, 2015) Sumaira Yaseen
    Air pollution can be purified using solar chimney in a metropolitan city. Reduction of carbon dioxide (CO2) and sulfur dioxide (SO2) from the atmosphere play an important role in these purifications. In this study a chimney is proposed to be constructed in the heart of the town, where the most polluted air needs to be cleaned. The water is sprayed on the top of the chimney that makes the air cool and denser. The cooled denser air descends to the bottom of the chimney where air turbines are placed. This air starts the turbine to produce electricity. The air is then passed through the filters which capture the particulate. To remove the undesirable gases the appropriate chemical reagents are placed at the bottom. Various routes of capturing CO2 and SO2 from the air are discussed physically and thermodynamically feasible. It is explained how large scale collection of these gases can be made using different reagents such as (NaOH, KOH, K2CO3 and Ca (OH)2) as possible sorbent. The cost estimate and energy producers are briefly discussed. Other quantities involved during this process as gas uptake, liquid flow rate, air flow rate, air pressure drops are discussed. This technique, in particular, is applied to Lahore to clean its air. For that purpose the environmental data for Lahore metropolitan area has been collected and analyzed. By using solar chimney approximately 30% air pollution can be reduced in Lahore city.