PREDICTION OF TOTAL EMISSIVITY OF CO2 IN TROPOSPHERE BY SEVERAL METHODS | ||
| The International Conference on Applied Mechanics and Mechanical Engineering | ||
| Article 68, Volume 15, 15th International Conference on Applied Mechanics and Mechanical Engineering., May 2012, Pages 1-11 PDF (152.87 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/amme.2012.37026 | ||
| Authors | ||
| K. H. Byun1; L. D. Chen2 | ||
| 1Professor, Dpt. of Mechanical Robotics and Energy Engineering, Dongguk University, Seoul, Republic of Korea. | ||
| 2Professor & Director, School of Engineering and Computing Sciences, Texas A&M University, Corpus Christi, USA. | ||
| Abstract | ||
| ABSTRACT The effects of CO2 ppm in troposphere on both spectral and total emissivity are reviewed using several methods. The compared models are by Hottel [2], Bliss [3], Atwater and Ball [4, 6], wide Band Model by Edwards [5], Yamamoto and Sasamori [6,7], and using HITRAN data base [8]. For spectral emissivity, the results by Yamamoto and Sasamori match well with predictions using HITRAN data base. For total emissivity, the deviations between models are rather large and sometimes more than about 0.05. In general, for a given condition, the upper bound of total emissivity is given by Hottel, and lower bound is given by HITRAN. The predictions by Edwards are in between but near to those of Hottel. The CO2 ppm varied from 300 ppm to 600 ppm, temperature varied from 220K to 300K, and pressure from 0.3 to 1.0atm. As CO2 ppm increases, the total emissivity increases. For a given CO2 ppm, the total emissivity increases as the air thickness increases which are also true for both temperature and pressure increase. Around 260K, the total emissivity is less sensitive to increasing temperature than to decreasing temperature. For a given pressure change, the total emissivity values by wide band model changes more than the values by HITRAN. The reverse is true for temperature change. | ||
| Keywords | ||
| Co2; Spectral emissivity; Total emissivity; Wide Band Model; HITRAN; Troposphere | ||
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