The Regularity Of Exergy Transfer In The Heat Conduction And Application

Exergy is the criterion of object or substance flux theoretical doing-work competence when it is definite that environment is the fundamental level, and it is a thermodynamics state parameter. It has necessarily the peculiarity of energy because it has particular implication, and that is, it has converted and transferred peculiarity. Exergy Transfer Theory studies the transfer and conversion of exergy, and is a marginal subject that is crossed by thermodynamics, transmission and hydrodynamics, and is a thorough research direction as to exergy theory. With the exploitation and rational use of energy, some descriptions for traditional thermodynamic system which only analysis energy based on the quantitative loss or quality depreciation have to meet the needs of theoretical research and practical application, and the theory of exergy needs to be further developed. In this paper, exergy transfer in the heat conduction process is calculated systematically, factor affected on exergy transfer coefficient and exergy flux density is analyzed, and preliminary research is developed on the basis of part of engineering project problem, and some conclusions are obtained.This paper reviews the birth, development and evolution of concepts of exergy transfer theory, outlines the theory approaches to exergy transfer research, and preliminary exploitation about engineering exergy transfer is made, and proposes the new tasks to be further studied.The universality of phenomenon of exergy transfer is probed and the rationale and the universal regularity are expounded, and evaluating criterions of engineering exergy transfer is provided.Based on the exergy transfer equations, exergy transfer in the heat conduction process at the steady state are calculated for the infinite plate at the First Type boundary condition, and two results are compared when conductivity is constant and changeable with temperature.Exergy transfer in the conduction process at the unsteady state for the infinite plate with the Third Type boundary condition was calculated, and two results were compared when conductivity is a constant and changeable with temperature, factor affected on exergy transfer coefficient and exergy flux density is analyzed, and the regularity of exergy transfer with space and time is discussed.Mathematics model of exergy transfer in the two dimensional conduction is established by using conduction Differential Equation and incorporating the evaluating criterions of engineering exergy transfer, and the definition formula of exergy transfer coefficient and exergy flux density were provided. The calculation flow chart of exergy transfer by Finite Difference Methods is expound.Aiming for practical thermal process of petroleum exploitation, Mathematics model is established on the basis of rational simplify and hypothesis, exergy transfer in the heat conduction of steady state zone of heavy oil reservoir is calculated, and the result is analyzed in order to fine the factor which affected on the temperature of heavy oil reservoir and effective heating radius, regular of exergy transfer coefficient and exergy flux density in the process is clarified.Taking petroleum strata initial stage and drive forward position as an object, on the basis of rational simplification and hypothesis, Mathematics model is established. Time and poured stream quantity are determined in order to anticipatory petroleum exploitation effect, and the effect on the exergy transfer coefficient and exergy flux density is analyzed in order to provide useful information on practical parameter optimization of heating driving.The factors that affect the exergy transfer in the heat conduction process are analyzed, and modified measures are applied on the base.