Splitting the dynamic exergy destruction within a building energy system into endogenous and exogenous parts using measured data from the building automation system

Sayadi, Saeed; Tsatsaronis, George; Morosuk, Tatiana

doi:10.1002/er.5213

Cited by 14 publications

(5 citation statements)

References 15 publications

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Section: Exmentioning

confidence: 99%

“…Note that the endogenous exergy destruction is resulted from the interactions in the k th component, whereas the exogenous exergy destruction is presented by the rest of overall exergy destruction, described as the irreversibility that takes place in other components of the thermal system. The endogenous exergy destruction can be computed as follows where Ė P, k ideal expresses the product exergy, when all components are under ideal condition, except the k th component, and ε k indicates the exergy efficiency, which is discussed later.…”

Section: Thermodynamic Modelingmentioning

confidence: 99%

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Advanced Exergy Analysis of an Acid Gas Removal Plant to Explore Operation Improvement Potential toward Cleaner Production

et al. 2021

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This research aims to conduct an integrated energy and exergy evaluation of an acid gas recovery (AGR) plant. An effective simulation platform is developed and linked to a thermodynamic modeling approach. A newly developed amine blend, composed of methyl-di-ethanolamine (MDEA), di-ethanolamine (DEA), and piperazine (PZ), is utilized to absorb the acid gases. Based on the classical energy analysis, an energy loss of 70.79 MW and an energy efficiency of 90.29% are attained for each process component. Conventional exergy analysis is then conducted, and the sources of irreversibility are identified. The postprocessing is performed on the conventional exergy evaluation results using an advanced exergy method, to obtain a more realistic insight into the system's energy/exergy performance. It is concluded that stripper and absorber account for the maximum exergy destructions of 8.15 and 7.55 MW, respectively; this shows significant potential for operation improvement in these two key equipment. Also, it is concluded that 5.47 and 4.92 MW unavoidable exergy destructions occur in the stripper and absorber, respectively, which cannot be prevented. It is found from the advanced exergy analysis that the absorber, stripper, and heat exchanger with the greatest recoverable exergy amount (e.g., exergy rehabilitation ratio) exhibit substantial operation enhancement capability in comparison to the other process equipment. The overall exergy efficiency of the entire system is enhanced from 99.70 to 99.90%, when the technological constraints are abolished and the ideal condition governs. The results of avoidable/endogenous exergy destruction reveal high potential of the absorber (2.58 MW), stripper (2.18 MW), heat exchanger (0.74 MW), and valve (0.19 MW) in terms of operation improvement compared to the other process components. Based on the environmental analysis, a large amount of CO 2 emission (22.12 ton•day −1 ) can be prevented, when the process components are technologically upgraded.

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Section: Exmentioning

confidence: 99%

Section: Thermodynamic Modelingmentioning

confidence: 99%

Advanced Exergy Analysis of an Acid Gas Removal Plant to Explore Operation Improvement Potential toward Cleaner Production

et al. 2021

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“…Table 2 shows the cost balance equations and auxiliary equations for the plant components according to the SPECO method. The formulated matrix for calculating the unknown specific costs given in Table 2 (c 2 , c 3 , c 4 , c 5 , c 6 , c 7 , c 8 , c 9 , c 10 , c 11 , c 14 , c w,HPT , c w,IPT , c w,LPT , c 30 and c w,net ) is given by equation (15), where…”

Section: Conventional Exergoeconomic Analysismentioning

confidence: 99%

“…4 Component endogenous exergy destruction rates may be determined using the engineering approach, 2 thermodynamic cycles, [8][9][10][11] exergy balance method, 12 equivalent component method, 12 structural theory analysis, 13 malfunction/ dysfunction analysis, 14 and the method of serial arrangement. 15 However, shortcomings have been identified in the use of these approaches, e.g. the thermodynamic cycle approach provides results only for systems for which a thermodynamic cycle can be defined; the engineering approach cannot be used for the evaluation of endogenous exergy destruction if the exergy efficiency cannot be kept constant when varying the exergy destruction of other components 12 ; a large number of nonstandard simulations is required to predict the second law ideal system operation when using the thermodynamic approach 15 ; the malfunction/dysfunction analysis approach is more suited for system diagnostic purposes rather than system design, 16 etc.…”

Section: Introductionmentioning

confidence: 99%

Advanced exergoeconomics of a steam power plant based on double-tier splitting of exergy destruction rates

Azubuike

Njoku

Ekechukwu

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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The advanced exergy and exergoeconomic analysis methodologies excel over their conventional counterparts by quantifying endogenous/exogenous exergy destruction rates and related costs that reveal the interactions among system components. By quantifying avoidable/unavoidable losses, they also reveal the potentials for component improvements that are practically achievable. These data are imperative for improving the cost-effectiveness of thermal systems. This paper presents the performances of a complex gas-fired power plant obtained via an advanced exergoeconomic analysis. The study advances existing studies by undertaking second-tier splitting of exergy destruction cost rates and associated investment cost rates to determine avoidable endogenous, unavoidable endogenous, avoidable exogenous, and unavoidable exogenous cost rates of the plant’s components. Component exergy destruction cost rates were found to be predominantly unavoidable, while most of the component investment cost rates were avoidable. Except for the low pressure heater 3, exergy destruction cost rates are endogenous in all the plant components, contributing 84% of overall cost rates. The proportions of exergy destruction cost rates and investment cost rates of the plant that are avoidable endogenous were 21% and 28% respectively, while the respective portions that are avoidable exogenous were 4% and 27%. Furthermore, it was shown that as much as 96.3% improvements in overall plant cost-effectiveness were achievable by eliminating avoidable endogenous exergy destruction cost rates and investment cost rates for major components of the plant.

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“…Many research works were conducted in recent years that showed the importance and need for profiling the diffuser part of the primary flow nozzle. The authors of the works [22][23][24] conducted a significant part of the theoretical research, which requires further experimental re-examination.…”

Section: Literature Reviewmentioning

confidence: 99%

Experimental Stand for Studying the Working Process in a Liquid-Vapor Jet Device with Replaceable Diffuser Parts

Sharapov

Husiev

Krmela

2022

JES

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The article describes the prospects for experimental research of liquid-vapor jet devices with adaptable geometry of the flow part of the primary flow nozzle. To formulate the research objectives, a critical analysis of state-of-the-art studies was conducted among native and foreign scientists studying two-phase jet devices. As a result, of the literature survey, we saw that the working process of the two-phase jet devices, which include liquid-vapor jet devices, is quite complicated to study. So, the achieved results of theoretical studies require clarification and the conduction of additional experimental studies. The article provides a description and experimental research method on the liquid-vapor jet devices with a replaceable diffuser part of the primary flow nozzle. The program and the method contain the range of changing operational parameters while conducting experimental studies. The functional scheme of the experimental scheme and the devices to control and measure pressure in the critical points of the scheme are proposed.

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Splitting the dynamic exergy destruction within a building energy system into endogenous and exogenous parts using measured data from the building automation system

Cited by 14 publications

References 15 publications

Advanced Exergy Analysis of an Acid Gas Removal Plant to Explore Operation Improvement Potential toward Cleaner Production

Advanced Exergy Analysis of an Acid Gas Removal Plant to Explore Operation Improvement Potential toward Cleaner Production

Advanced exergoeconomics of a steam power plant based on double-tier splitting of exergy destruction rates

Experimental Stand for Studying the Working Process in a Liquid-Vapor Jet Device with Replaceable Diffuser Parts

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