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Thermodynamic relation between irreversibility of heat transfer and cycle performance based on trapezoidal model

机译：基于梯形模型的传热不可逆性与循环性能之间的热力学关系

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摘要

Irreversible degree of heat transfer in organic Rankine cycle (ORC) is proposed in this paper. Based on a trapezoidal cycle (TPC) and its theoretical model, the model and mathematic formulas of irreversible degree of heat transfer is built. Thermodynamic relation between irreversible degree and cycle performance (thermal efficiency, net power output and exergy efficiency) is built and studied, which can be applied to the coupling optimization between cycle performance and heat transfer processes. Similar to net power output, there exists a kind of shift-curve of irreversible degree and the corresponding shift-temperature of heating fluid for working fluids, which indicates the shift of irreversible degree from having optimum condition with a minimum to monotonic decrease with heating fluid temperature. The range of irreversible degree and range of cycle performance according to irreversible degree are obtained respectively. Moreover, a model of working fluid with linear saturation line is proposed to study the general thermodynamic principles of TPC (or ORC) theoretically without the restriction of actual working fluids.
机译：提出了有机朗肯循环中不可逆的传热度。基于梯形循环（TPC）及其理论模型，建立了不可逆传热程度的模型和数学公式。建立并研究了不可逆度与循环性能（热效率，净功率输出和火用效率）之间的热力学关系，可将其应用于循环性能与传热过程之间的耦合优化。与净功率输出相似，存在一种不可逆度的位移曲线和相应的工作流体加热流体的位移温度，这表明不可逆度的位移从具有最小的最佳条件到随加热流体的单调减小而变化。温度。分别得到不可逆度的范围和根据不可逆度的循环性能的范围。此外，提出了具有线性饱和线的工作流体模型来理论上研究TPC（或ORC）的一般热力学原理，而不受实际工作流体的限制。

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