Generalized transfer and conversion equation of exergy [传递和转化的普遍化动力学方程]

作者：Li K.-C.; He G.-X.; Liu K.-C.; Tang Y.-M.; Yang S.; Yan H.-G.; Chen H.-Y.; Han G.-Z.^*

来源：Huaxue Gongcheng/Chemical Engineering (China), 2019, 47(6): 11-15.

DOI：10.3969/j.issn.1005-9954.2019.06.003

• Energy postulate
• Generalized equation
• Irreversibility
• Transfer postulate

Although energy is conserved during the transfer and conversion processes,exergy is not conserved,and different form of exergy has different amount of dissipation (destruction) in processes. A better understanding of these processes will be of great benefit to create new energy-conversion and energy-utilization technology. Any form of energy and exergy can be mathematically expressed as the product of a pair of conjugate basic intensive quantity and basic extensive quantity. Multiplying the balance equation of a basic extensive quantity by the conjugate intensive quantity,a generalized transfer and conversion equation of exergy was derived,which revealed the transfer and conversion relation among any specified form of exergy and the others. The transfer and conversion equations of kinetic,chemical,pressure (strain),electric and thermal exergy,which were commonly used in engineering,were given. In the resultant total exergy equation,not only terms appear that explicitly reveal conversions between different forms of exergies,but also the irreversibility of different conversions is quantitatively included.

• 单位
  华南理工大学