A New Simple Method for Estimating Exergy Destruction in Heat Exchangers

Paniagua, Ignacio López; Martín, Javier Rodríguez; Fernández, Celina González; Álvaro, Ángel Jiménez; Carlier, Rafael Nieto

doi:10.3390/e15020474

Cited by 35 publications

(14 citation statements)

References 11 publications

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“…The third source is related to the fluid friction, as a result of the movement along the pipes, and it appears in the form of pressure reduction. The order of exergy destruction is exactly identical to the previous literature [15], whereas, the level change is based on the HRSG configuration. However, knowing the sources of irreversibilities is considered to be useful information, in order to improve the component by eliminating, or limiting, the causes behind that.…”

Section: Resultssupporting

confidence: 54%

“…The Gaussian numerical integration was used in the analysis to simplify the calculations with more accurate results. More details about the proposed method and the Gaussian numerical integration are fully discussed in reference [15].…”

Section: E W Andmentioning

confidence: 99%

“…The waste exergy value of HRSG unit can be obtained based on the source of irreversibilities, using a new approach proposed by Paniagua et al [15]. The waste exergy results from exergy destruction and exergy release to the environment, and can be calculated by:…”

mentioning

confidence: 99%

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Energetic and Exergetic Analysis of Combined Cycle Power Plant: Part-1 Operation and Performance

2015

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Energetic and exergetic analyses are conducted using operating data for Sabiya, a combined cycle power plant (CCPP) with an advanced triple pressure reheat heat recovery steam generator (HRSG). Furthermore, a sensitivity analysis is carried out on the HRSG using a recent approach to differentiate between the sources of irreversibility. The proposed system was modelled using the IPSEpro software and further validated by the manufacturer's data. The performance of the Sabiya CCPP was examined for different climatic conditions, pressure ratios, pinch point temperatures, high-pressure steam, and condenser pressure values. The results confirmed that 60.9% of the total exergy destruction occurs in the combustion chamber, which constitutes the main source of irreversibilities within a system. The exergy destruction was significantly affected by both the pressure ratio and the high-pressure steam, where the relation between them was seen to be inversely proportional. The high-pressure stage contributes about 50% of the exergy destruction within the HRSG compared to other stages and the reheat system, due to the high temperature difference between the streams and the large number of components, which leads to high energy loss to the surroundings. Numerous possibilities for improving the CCPP's performance are introduced, based on the obtained results.

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Section: Resultssupporting

confidence: 54%

Section: E W Andmentioning

confidence: 99%

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Energetic and Exergetic Analysis of Combined Cycle Power Plant: Part-1 Operation and Performance

2015

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“…Assuming the mass flow rates

with no work or heat loss, the exergy destruction rate for HX-1′ is [ 23 ]:

…”

Section: System Exergy Analysismentioning

confidence: 99%

Operating Range for a Combined, Building-Scale Liquid Air Energy Storage and Expansion System: Energy and Exergy Analysis

Howe

Pollman

Gannon

2018

Entropy

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This paper presents the results of an ideal theoretical energy and exergy analysis for a combined, building scale Liquid Air Energy Storage (LAES) and expansion turbine system. This work identifies the upper bounds of energy and exergy efficiency for the combined LAES-expansion system which has not been investigated. The system uses the simple Linde-Hampson and pre-cooled Linde-Hampson cycles for the liquefaction subsystem and direct expansion method, with and without heating above ambient temperature, for the energy production subsystem. In addition, the paper highlights the effectiveness of precooling air for liquefaction and heating air beyond ambient temperature for energy production. Finally, analysis of the system components is presented with an aim toward identifying components that have the greatest impact on energy and exergy efficiencies in an ideal environment. This work highlights the engineering trade-space and serves as a prescription for determining the merit or measures of effectiveness for an engineered LAES system in terms of energy and exergy. The analytical approach presented in this paper may be applied to other LAES configurations in order to identify optimal operating points in terms of energy and exergy efficiencies.

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“…2016, 8(3S), 314-331 316 exchangers. [9]  Shukuya et al published an introduction to the concept of exergy. [10]  Yilmaz et al examined the performance evaluation criteria of heat exchangers based on the analysis of second law.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic optimization of heat exchanger tanks by exergy analysis method

Ghorbani¹,

Hedayat²

2016

J. Fundam and Appl Sci.

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The paper introduces heat exchanger tanks, detailing their dominant thermodynamic relations to obtain the exergy analysis relations of heat exchanger tanks. Heat exchanger tank is examined under various laboratory conditions, including the power of heat element inside the tank, mass flow rate of cooling water of tank wall and the mixer speed inside the tank which were all variable. The needed data relating to the water temperature inside the tank as output water after cooling the tank wall based on these conditions. The exergy loss (irreversibility) and efficiency diagrams were then drawn and the optimization parameters of performance and their range were evaluated using exergy analysis. This was meant to increase the efficiency and decrease the energy consumption. The results indicate that under thr circumstances of controlling mass flow rate of input cold water and power of heat element as well as the mixer speed, respectively, in their possible minimum and maximum measures, the system performs in optimal conditions according to exergy analysis.

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A New Simple Method for Estimating Exergy Destruction in Heat Exchangers

Cited by 35 publications

References 11 publications

Energetic and Exergetic Analysis of Combined Cycle Power Plant: Part-1 Operation and Performance

Energetic and Exergetic Analysis of Combined Cycle Power Plant: Part-1 Operation and Performance

Operating Range for a Combined, Building-Scale Liquid Air Energy Storage and Expansion System: Energy and Exergy Analysis

Thermodynamic optimization of heat exchanger tanks by exergy analysis method

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