The Role of Internal Irreversibilities in the Performance and Stability of Power Plant Models Working at Maximum ϵ-Ecological Function

Abstract

The proposal of models that account for the irreversibilities within the core engine has been the topic of interest to quantify the useful energy available during its conversion. In this work, we analyze the energetic optimization and stability (local and global) of three power plants, nuclear, combined-cycle, and simple-cycle ones, by means of the Curzon–Ahlborn heat engine model which considers a linear heat transfer law. The internal irreversibilities of the working fluid measured through the r-parameter are associated with the so-called “uncompensated Clausius heat.” In addition, the generalization of the ecological function is used to find operating conditions in three different zones, which allows to carry out a numerical analysis focused on the stability of power plants in each operation zone. We noted that not all power plants reveal stability in all the operation zones when irreversibilities are considered through the r-parameter on real-world power plants. However, an improved stability is shown in the zone limited by the maximum power output and maximum efficiency regimes.

Optimizing power of a variable-temperature heat reservoir Brayton cycle for space nuclear power plant

“…FTT can consider the effects of heat transfer loss and the limitations of time and heat exchanger (HEX) area between the heat reservoir (HR) and WF which are largely ignored in classical thermodynamics. Many researchers have introduced FTT into the performance optimizations of thermal cycles and processes, including the optimal performances of the Carnot cycles (Curzon & Ahlborn, 1975;Valencia-Ortega et al, 2021), Stirling engines (Xu et al, 2022), diesel engines Ge et al, 2021), dual cycles (Ge et al, 2022), Kalina cycles (Feng et al, 2020), dual-Miller cycles (Ebrahimi, 2021), organic Rankine cycles (Park & Kim, 2016;Wu, Ge et al, 2020;Feng et al, 2021), combined cycles (Gonca & Guzel, 2022;, thermoelectric devices (Chen et al, 2020a;Chen et al, 2021a;Chen & Lorenzini, 2022a), thermal Brownian cycles (Qi et al, 2021a(Qi et al, , 2021bQi et al, 2022aQi et al, , 2022b, thermoradiative devices (Li & Chen, 2021;Zhang, Yang et al 2021), blue engines (Lin et al, 2022), electron engines (Ding et al, 2021;Qui et al, 2021a), thermionic devices (Qiu et al, 2021b), methane reforming , chemical engines (Chen & Xia, 2022a, chemical pumps , Brayton cycles (Ibrahim et al, 1991;Ust et al, 2006;Chen et al 2020bChen et al , 2020cQui et al, 2022;Jin et al, 2022), and refrigeration cycles (Chen & Lorenzini, 2022b), as well as the optimal configurations of refrigeration cycles (Badescu, 2021;Paul & Hoffman, ...…”

Four-Objective Optimization for an Irreversible Porous Medium Cycle with Linear Variation in Working Fluid’s Specific Heat

“…Finite time thermodynamics (FTT) [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ] has been made significant progress in the research of thermal cycles and processes, including optimal configurations [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ] and optimal performances [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ]. The FTT studies of internal combustion engine cycles mostly focus on the following factors [ 33 ]: the effects of different loss models such as heat transfer loss (HTL) [ 34 ], friction loss (FL) [ 35 ] and internal irreversibility loss (IIL) [ 36 ] on the performances of cycles; the effects of power output ( ) and thermal efficiency ( ) [ 37 ], efficient power ( ) [ 38 ], ecological function ( ) [ 39 ], power density ( ) [ 40 ] and other ob...…”

Maximum Profit Output Configuration of Multi-Reservoir Resource Exchange Intermediary

“…Since the 1970s, Finite Time Thermodynamics (FTT) has made great progress in physics and engineering fields [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. Many scholars have researched the optimal performances of thermal and chemical processes and cycles [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. A great deal of work has been performed for the optimal configurations of thermal and chemical processes and cycles [ 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 ], including heat transfer, mass transfer, heat and mass transfer, ...…”