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本文从最常见的热源间热机装置简化出热源间以工质定常流动实现定常能量转换的热机模型,沿用γ、π、(?)等概念,并以工质吸、放热的传热面积之和定义了适合于该物理模型的“功率密度ω”概念,导出了η_0-ω谱函数及最小传热面积原理,揭示了上述热机内在的基本流、阻、势关系。所得结论比活塞机模型更有工程实用价值。文中以查得的实际工程资料与设计方案对本文结论提供了旁证。针对蒸汽动力装置的实际过程提出了兼顾输出功率与热效率用有限时间热力学方法选择和评估实际动力装置,与热工参数最优化结果相比,效果令人满意。
In this paper, the most common heat source intercooler between heat sources is to simplify the heat engine model which can realize the steady energy conversion by the steady flow of working fluid, followed the concepts of γ, π, (?) And the heat transfer area And defines the concept of “power density ω” that is suitable for the physical model. The η 0 -ω spectrum function and the principle of minimum heat transfer area are derived, and the fundamental flow, resistance and potential relationships of the heat engine are revealed. The conclusion is more engineering practical value than piston model. This paper provides evidence of the conclusion of this paper based on the actual project data and design scheme. For the actual process of steam power plant, both the output power and the thermal efficiency are put forward to select and evaluate the actual power plant by using the finite-time thermodynamic method. Compared with the result of optimization of the thermal parameter, the result is satisfactory.