Abstract: Based on the analysis of composition and transferring mechanism for both exergy transfer unit and exergy conversion unit, the general model of exergy transfer was established. According to the analysis of exergy transfer characteristics for the system, the properties and functions of exergy transfer unit, the evaluation criterions are defined and established. The evaluation criterions consist of three primary criterions including exergy transfer intensity, ratio of the combustion production actual thermal exergy with theoretical exergy, and volume thermal exergy intensity. Three secondary evaluation criterions including weighting of effective pre-heat, ineffective pre-heat exergy, and weighting of heat dissipating are also presented. This evaluation system can evaluate the energy quality and quantity utilizing for the system comprehensively. The approach applying exergy transfer model and evaluation criterions, can describe the whole exergy dynamic state in the combustion system. Moreover, the system exergy transfer calculation method of steady state combustion is developed based on the energy and exergy balance equations, to describe the quantitative analysis of exergy transfer. The calculation examples are provided to summarize the key points and result in calculating the combustion temperature, exergy transfer velocity and evaluation criterions.

Key words: Combustion system, Evaluation criterions, Exergy transfer, Power boiler, Bio-inspired structure, Large opening area, Layout optimization, Multi-functional optimization, Response surface method