Development and implementation of a workflow for measurement of surface temperature by means of infrared thermography and Thermodynamic and economic analysis of the incorporation of the supercritical carbon dioxide Brayton cycle into combined cycle power plants
Cloward, Jacob Austin
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In part one a workflow for the measurement of surface temperature by means of infrared thermography using a semi empirical equation based on Planck's law of radiation is designed and implemented in Matlab. Procedures for acquiring scaled irradiance from camera detector signal using pixelwise radiometric self calibration and nonuniformity correction are described and implemented. Thermographic images are rectified using a plane projective transformation to transform pixel location into physical locations on the object plane. Parameters of the semi empirical equation for the determination of temperature from scaled irradiance are precalibrated. A procedure for the determination of surface emissivity is designed and employed to determine the emissivity of various surface coatings. A method for in situ calibration of the relationship between temperature and scaled irradiance is shown and used for subsequent measurements. Experiments are carried out for validation of the technique. For the in situ adjustment of a single parameter with the support of a single thermocouple, a measurement uncertainty of 2 K is found, and for the case of two parameter adjustment with support from two thermocouples, a measurement uncertainty of 1.2 K is found. In part two the profitability of several combined cycle power plant layouts incorporating supercritical carbon dioxide Brayton bottoming cycles is investigated comparative to traditional combined cycle power plants. Estimated levelized cost of electricity and steady state design point thermodynamic analysis are used to determine profitability. Five supercritical carbon dioxide cycle layouts are investigated both as a replacement to and in tandem with the traditional steam Rankine bottoming cycle. High uncertainty in cost estimation and limitations of the constraints in the thermodynamic model prevent a definitive conclusion, but the results suggest that the incorporation of supercritical carbon dioxide cycles into combined cycle power plants has the potential to improve upon traditional combined cycle power plants in terms of profitability.