Design option evaluation report Essay Example | Topics and Well Written Essays - 1000 words

Design option evaluation report - Essay Example Moreover, direct radiation are normally scattered by the atmosphere (Heard, 2006). Alterations of temperature have been depicted to appreciably affect reaction speed for particular trace compounds. Facts that strongly influence the design of a smog chamber and its corresponding auxiliaries for studying reactions under diverse simulated tropospheric conditions are mainly concentration of chemicals and temperature. Low concentration of members within the chemical reactions presents both analytical complications and stringent demands on the underlying cleanliness of the air utilized to make up the reaction mixture (Burrows, Borrell & Platt, 2011). Humidity ought to be controlled. The materials of construction ought not to introduce appreciable concentrations of impurities or react with the existing components of the reaction mixture (Heard, 2006). The radiation sources employed for irradiation of the smog chamber contents ought to simulate the intensity and peculiar distribution existing within the lower troposphere in the spectral locations and corresponding temporal distributions in the reaction chamber ought to be as even as feasible. In China, some small volume smog chambers have been developed to study gas-phase kinetic mechanisms, which precisely temperature controlled indoor smog chamber made of FEP Teflon film to study the SOA formation. Nevertheless,the small volumes of these smog chambers impact the disadvantage of relatively large wall effects thus making it cumbersome for the experiments of long durations. There exist numerous means to study photochemical smog, with the most common one being utilizing data from a smog chamber to establish a reaction model (Burrows, Borrell & Platt, 2011). Smog chamber facility is utilized to excite atmosphere photochemical reactions processes through irradiating primary pollutants namely NOz and corresponding hydrocarbons within the chamber. In 1952, a serious case of