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This study attempts to provide quantitative methodology for characterizing the energy utilization efficiency of refinery processes. A complete data bank was developed which predicts the thermodynamic availability, enthalpy, and entropy of petroleum fractions, H2O and air. This is the first attempt to provide thermodynamic availability of petroleum fractions in the public domain. Thermodynamic analysis of flow and calculation of thermodynamic availabilities for each stream of a refinery unit has been completed. An atmospheric distillation unit was analyzed. The thermodynamic analysis was based on an availability balance including a lost work term associated with each piece of equipment; from the availability analysis the extent of irreversibility associated with each process is determined. The lost work is then summed over the total system, to yield the total process lost work. Various efficiency and characterization parameters, based on the ideal work of the process, are defined as a means of measuring or characterizing the energy utilization effectiveness of the process. An availability effectiveness is given specific definition for the common equipment types encountered on refinery process flowsheets. (Portions of this document are not fully legible)