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一、问题的提出通常对热工设备进行热性能评价的主要指标是热效率。但因热效率只是从能量数量上进行比较,因此带来了一系列弊病。它不能反映过程内部不可逆性引起的作功能力的下降,其数值并不代表热工设备动力性能的优劣,而仅仅从数量上表示了能量转换的水平。 (火用)作为一种评价能量价值,衡量作功能力的参数,它不仅可从数量和质量的结合上评定能量的品位,而且可对热力过程和循环进行全面的热力学分析。指出内部因不可逆性所引起的作功能力的减少,说明热工设备的热力学完善程度。(火用)分析是在(火用)平衡基础上进行热力学
First, the problem is usually thermal equipment thermal performance evaluation of the main indicators of thermal efficiency. However, because thermal efficiency is only compared with the amount of energy, it brings a series of drawbacks. It can’t reflect the decline of the function caused by the internal irreversibility of the process. Its value does not represent the pros and cons of the thermal performance of thermal equipment, but only represents the level of energy conversion from the quantity. (Exergy) As a parameter that evaluates energy value and measures it as a function, it can not only evaluate the grade of energy from the combination of quantity and quality, but also can perform comprehensive thermodynamic analysis of thermal process and circulation. It points out that the reduction of internal function caused by irreversibility indicates the thermodynamic perfection of thermal equipment. (Exergy) analysis is based on exergy balance