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直到现在为止,科技领域在对热能动力装置进行计算、分析时,广泛地采用焓熵图。根据热力学第一定律计算功和热量,焓是个重要参数,采用它来标定纵坐标显然是方便、合理的。熵是热力学第二定律所导出的一个参数,与能的“质”有密切的联系,本应在动力装置的效率分析中起很大的作用,但是由于它并不直接地规定能的质,使得焓熵图的横坐标不能充分地显示其作用。热能动力工作者在利用焓熵图时,很少有人关心横坐标——熵的数值,熵在这里充其量也就是起个定性的作用。因此,可以说,焓熵图是个“半面运转的图线”。笔者
Until now, the field of science and technology in the calculation of thermal power plant, analysis, the widely used enthalpy diagram. Calculating work and heat according to the first law of thermodynamics, enthalpy is an important parameter, it is obviously convenient and reasonable to use it to calibrate the ordinate. Entropy, a parameter derived from the second law of thermodynamics, is closely related to the “quality” of energy and should have played a significant role in the efficiency analysis of power plants. However, since it does not directly specify the energy quality, So that the abscissa of the enthalpy diagram can not fully show its effect. Few people care about the value of abscissa-entropy when using the enthalpy-entropy diagram, and entropy here is a qualitative one at best. Therefore, it can be said that the enthalpy entropy graph is a “half-graph”. author